Investigation on Fecundity and Egg Size in Cultured and Natural Crayfish Population of Astacus leptodactylus Esch. in Bulgaria
|
|
- Linette Hunt
- 5 years ago
- Views:
Transcription
1 208 Bulgarian Journal of Agricultural Science, 12 (2006), National Centre for Agrarian Sciences Investigation on Fecundity and Egg Size in Cultured and Natural Crayfish Population of Astacus leptodactylus Esch. in Bulgaria P. VASILEVA, A. ZAIKOV and T. HUBENOVA Institute of Fisheries and Aquaculture, Varna, Branch Plovdiv, BG-4003 Plovdiv, Bulgaria Abstract VASILEVA, P., A. ZAIKOV and T. HUBENOVA, Investigation on fecundity and eggs size in cultured and natural crayfish population of Astacus leptodactylus Esch. in Bulgaria. Bulg. J. Agric. Sci, 12: The objective of the present study was investigation on fecundity (pleopodal egg number) and egg size (weight and diameter) of both a cultured and a natural Narrow-clawed crayfish population (Astacus leptodactylus Eschscholtz, 1823). Further the relationship between these features and the body weight and length, and length and width of the carapace was studied. The investigation was carried out in May 2001 on 71 female crayfish, reared in carp ponds and in May 2002 on 60 females from Piasachnik dam-lake in Bulgaria. It was found out that the fecundity of the pond-reared crayfish population was pleopodal eggs; the average egg weight was mg and the egg diameter was mm. The fecundity of the natural crayfish population in Pyasachnik dam-lake was pleopodal eggs; the average egg weight was mg and the egg diameter was mm. There are significant differences between the number of eggs in both investigated populations. The crayfish females from Pyasachnik dam-lake have more pleopodal eggs compared to those reared in ponds (P<0.05). On the contrary, the average values of egg weight and diameter of the pond-reared population were bigger (P<0.001) in comparison to the dam-like ones. A low correlation coefficient (r<0.3) was found between the egg weight and diameter and the investigated morphometric body features, but a considerable correlation (0.6<r<0.7) was proved between the egg number and the same morphometric body features. Key words: Astacus leptodactylus, egg size, exterior body parameters, fecundity Introduction To define the numbers of the generation, the establishment of fecundity is of importance. The study of 11 lake populations of Narrow-clawed crayfish Astacus leptodactylus Esch. in Russia and Belarus shows that fecundity is greatest in the azaikov@yahoo.com
2 Investigation on Fecundity and Egg Size in Cultured and Natural Crayfish Population populations of South Russia, where the center of the zoogeographic area of the distribution of this species is, and reduces in number towards to Belarus and Turkey (Alekhnovich and Kulesh, 1996; Koksal, 1988). The body length of the individuals from the 11 populations varies from 7 to 17 cm, the number of the pleopodal eggs being The investigation on populations from three crayfish species of the genus Astacus, points out that the ovary and pleopodal fecundity (number of ovary and pleopodal eggs) respectively were as follows: Astacus leptodactylus caspius has from 67 to 437 ovary eggs and from 48 to 264 pleopodal eggs, Astacus pachypus (Rathke, 1837) has from 50 to 110 ovary eggs and from 5 to 52 pleopodal eggs and Astacus kessleri (Schminkewitsch, 1884) has from 51 to 503 ovary eggs and from 37 to 320 pleopodal eggs (Cherkashina, 1970). A positive correlation between the dimensions of the body of female crayfish and the number of the ovary and pleopodal eggs is found out (Jarvelkung, 1958; Abrahamsson, 1971, 1972; Lindqvist and Louerkari, 1975; Lahti and Lindqvist, 1983; Harlioglu et al., 2004). The more the body weight and body length increases, the greater the fecundity becomes, however, when certain dimensions are reached (the latter being different for different populations) the above correlation becomes reverse. This phenomenon were registered mainly for north populations (Alekhnovich and Kulesh, 1996). The egg size of freshwater crayfish varies in relatively great ranges. Differences exist both in separate species and within the framework of a given species and even given individual (Cukerzis, 1989). The dependence between the basic exterior body parameters and the egg size have been investigated for the following species: Astacus astacus (Cukerzis, 1989; Abrahamsson, 1971; Lahti and Lindqvist 1983; Skurdal and Qvenild, 1986), Pacifastacus leniusculus, Dana (Abrahamsson, 1971; Mason, 1978) and for natural populations of Astacus leptodactylus Esch. (Koksal, 1984, 1988; Stucki, 1999; Harlioglu and Turkgulu, 2000, Harlioglu et al., 2004). For Bulgaria a limited data on egg size and their number and also the length of the examined individuals has been published for a couple of samples of Astacus leptodactylus and Astacus astacus (Bulgurkov, 1961). A complete characteristic of the dependence of the size of pleopodal eggs and basic exterior body parameters such as weight and length of the body, length and width of the carapace, as far as a cultivated population is concerned, has been executed (Hubenova et al., 2004). The objectives of the present investigation were the examination of pleopodal fecundity (number of pleopodal eggs) and the dimensions of the pleopodal eggs (weight and diameter) and their correlation with the following exterior parameters: body weight and length, and length and width of carapace, as well as the comparison of the established parameters for two groups of crayfish Astacus leptodactylus Esch.: the cultivated population in the Institute of Fishery and Aquaculture, Branch of Freshwater Fisheries, Plovdiv and the natural population of Piasachnik dame-lake. Materials and Methods The investigation was carried out in May 2001 with 71 female crayfish with pleopodal eggs, reared in carp ponds. The
3 210 exterior measurements of the body length, the length and width of carapace and abdomen were carried out following a scheme proposed by Skvorcov (1914). By using a tweezers 10 pleopodal eggs were removed from each crayfish, the diameter (with binocular microscope with an allowance of 0.01 mm) and the weight in fresh status (with analytical scales with an allowance of g) were individually measured. The values obtained were compared in 2002 with the respective values of these parameters for 60 female crayfish from the natural population of Piasachnik dame-lake, measured by the same parameters. The data obtained were analyzed by means of statistical software for Windows XP. Results The absolute values of the exterior parameters of the sexually mature female crayfish - body weight and length, and width and length of carapace are shown in Table 1. The body weight of the females from the cultivated population varies from to g, the average being g. This P. Vasileva, A. Zaikov and T. Hubenova parameter indicates a high degree of variation 38.42%, which is being determined by the different weights of the individuals of the examined sample. The body weight of females from the natural population ranges from tо g, the average being g, which analogically shows a high degree of variation 34.21%. The established average number of pleopodal eggs of the Narrow-clawed crayfish from the pond population is The females from the natural population have an average number of pleopodal eggs. Significant differences between the two groups as to this parameter were established. Таble 2 shows the linear equations and correlation coefficients describing the relationship between the number of the pleopodal eggs and basic exterior experiments in the two investigated populations. A considerable correlation between the analyzed results and the pleopodal fecundity (0.6184< r <0.7033) has been established for both groups of Narrow-clawed crayfish. From the individual measurements of the diameter and weight of 710 eggs it has been established that the average egg Table 1 Avarage values of the parameters total wet weight, total length, carapace length and carapace width in various experimental groups Parameter population population n=71 n=60 x+sd Cv, % lim x+sd Cv, % lim Total wet weight, BW,g Total length, TL, cm Carapace length, CL, cm Carapace width, CW, cm
4 Investigation on Fecundity and Egg Size in Cultured and Natural Crayfish Population Table 2 The linear regression and correlation coefficient between fecundity (pleopodal eggs, N) and total length (TL), carapace length (CL), carapace width (CW) and body weight (BW) for the two different populations For the cultivated population For the natural population N=47.88TL , r= N=48.355TL , r= N=92.94CL-328.6, r= N=96.069CL , r=0.696 N=180.07CW , r= N=183.47CW , r=0.642 N=5.228BW , r=0.646 N=3.54BW , r= weight and diameter for the cultivated population are g and 2.96 mm, respectively; values for the natural population are g and 2.75 mm, respectively (Таble 3). The linear equations describing the relationship between the weight and diameter of the pleopodal eggs and basic exterior body parameters are presented in Table 4. It has been found out that there exists a low correlation between the exterior parameters and the eggs size. The value of the correlation coefficient (r) varies from to for the cultivated and from to for the natural population. Aiming to eliminate the influence of the body weight on the features characterizing the fecundity and the dimensions of the eggs, the individuals from the both populations were divided into four weight groups (Таbles 5-8). The percentage distribution of the females in the weight groups is different for the two examined populations. As far as the cultivated population is distributed, the individuals from the weight group g (54.9%) and those from the weight group up to 30 g (39.5%) have the highest percentage. As far as the natural population is distributed, the group with body weight g constitute 58.3% from the investigated sample, whereas the next group, the weight of which varies from 50 to 70 g is presented with 30% from the total number of crayfish. Table 3 and diameter of pleopodal eggs in the two investigated groups of sexually mature female crayfish (n=number of the investigated eggs) Parameter of pleopodal eggs (EW, g) Diameter of pleopodal eggs (ED, mm) 0 0 x+sd Cv, % lim x+sd Cv, % lim
5 212 P. Vasileva, A. Zaikov and T. Hubenova Table 4 Linear regressions and correlation coefficients between the egg size (egg weight, EW and egg diameter, ED) of the pleopodal eggs and the total length (TL), carapace length (CL), carapace width (CW) and body wet weight (BW) for the two investigated populations For the cultivated population EW=0.1783TL , r= EW=0.415CL , r= EW=0.7CW+11.75, r= EW=0.01BW+13.28, r= ED=0.0218TL+2.72, r= ED=0.051CL+2.69, r= ED=0.098CW+2.69, r= ED=0.001BW+2.91, r=0.117 Significant differences in the exterior of the body (body weight and length, and carapace length and width, Tables 5, 6, 9, 10) between the individuals from the both populations by weight groups were established for particular parameters and only in some of the groups. Таble 11 shows the number of pleopodal eggs of the investigated populations by weight groups. As far as the pleopodal fecundity is concerned significant differences between separate weight groups have not been found out. In comparison with the lack of significant differences in the exterior and fecundity between crayfish from the both populations, the pleopodal eggs size (weight and diameter) for each weight group shows significantly higher values in the cultivated population compared to the natural one (Тable 12). The average diameter of the pleopodal eggs for the cultivated population is 2.96 mm, the smallest and biggest eggs being 2.4 and 3.7 mm, respectively. As far as the natural population is concerned the average diameter of the eggs For the natural population EW=0.2403TL+9.455, r= EW=0.5092CL+9.36, r= EW=0.9056CW+9.569, r=0.178 EW=0.0189BW , r= ED=0.0142TL+2.575, r= ED=0.03CL+2.57, r= ED=0.06CW+2.57, r= ED=0.001BW+2.7, r= is 2.75 mm, the boundary values being 2.2 and 3.4 mm (Таble 3). The established data on the egg size of the cultivated population are higher than the results obtained from Stucki (1999) for two Swiss lakes populations of Astacus leptodactylus Esch. (egg diameter 2.77 and 2.76 mm, ranging from 2.34 to 3.33 mm); higher than the data obtained by Harlioglu and Turkgulu (2000) for the Narrow-clawed crayfish population from Keban reservoir (egg diameter 2.59 mm) and higher than the values registered by Koksal (1984) for a natural population of Astacus leptodactylus salinus (egg diameter from 2.21 to 2.67 mm). The average values established by us for the egg diameter from the natural population (2.75 mm) are very close to the ones registered by Stucki (1999) for the natural populations in both Swiss lakes and are higher that the ones established by Koksal (1984) and Harlioglu and Turkgulu (2000) for natural populations in Turky. The data obtained once again supports the dependence established by other au-
6 Investigation on Fecundity and Egg Size in Cultured and Natural Crayfish Population Tables 5-8 Average values of the parameters body weight, total length, carapace length and carapace width for the various weight groups of Astacus leptodactylus (n=number of the individuals) Таble 5 group n x+sd Cv, % n x+sd Cv, % up to 30 g g g over 70 g Таble 6 group n x+sd Cv, % n x+sd Cv, % up to 30 g g g over 70 g Таble 7 group n x+sd Cv, % n x+sd Cv, % up to 30 g g g over 70 g Таble 8 Body weight, BW, g Body length, TL, cm Carapace length, CL, cm Carapace width, CW, cm group n x+sd Cv, % n x+sd Cv, % up to 30 g g g over 70 g
7 214 P. Vasileva, A. Zaikov and T. Hubenova Tables 9-10 Relative values of the parameters carapace length and carapace width for the various weight groups of Astacus leptodactylu (n=number of the investigated individuals) Table 9 group n x+sd Cv, % n x+sd Cv, % up to 30 g g g over 70 g Таble 10 group Carapace length, CL, % Carapace width, CW, % n x+sd Cv, % n x+sd Cv, % up to 30 g g g over 70 g Таble 11 Average number of pleopodal eggs of the populations by weight groups (n=number of individuals) Crayfish from ultivated Body weight n x+sd Cv, % n x+sd Cv, % up to 30 g g g over 70 g thors that the trophic level of the habitat (in our case the better trophic conditions in Piasachnik dame-lake and the supplemental feeding with sunflower groats and ground wheat in the pond) exerts a positive impact on the egg size (Koksal,1988; Holdich and Lowery, 1988). According to Koksal (1988) and Stucki (1999) larger female crayfish have bigger eggs, but Koksal (1984) points out that their size variation can be considerable. The data obtained in this study showed a significant increase of the weight and diameter of the pleopodal eggs for every weight
8 Investigation on Fecundity and Egg Size in Cultured and Natural Crayfish Population Table 12 and diameter of the pleopodal eggs of the both investigated populations by weight groups (n=number of the investigated eggs) their investigation the authors state that there does not exist any dependence between the size of the female crayfish and the eggs size. Similar conclusion has been also drawn by Ivanova and Vassilenko (1987) while examining the correlation between the egg size and the body length for the species Astacus leptodactylus. This is also true for investigations by Abrahamsson (1971), Lahti and Lindqvist (1983), Skurdal and Qvenild (1986) as regard the Noble crayfish Astacus astacus. On the basis of the data obtained in our investigation it can not be stated that small female crayfish have smaller egg size and vice versa, which is in conformity with Cukerzis s standpoint (1986 ) on Astacus astacus as well. For the examined group of individuals from the cultivated population the small- Body 0 0 n x+sd Cv, % n x+sd Cv, % t-test up to 30 g *** g *** g *** Over 70 g *** Diameter of the pleopodal eggs, ЕD, mm Body of the pleopodal eggs, ЕW, g 0 0 n x+sd Cv, % n x+sd Cv, % t-test up to 30 g *** g *** g *** Over 70 g *** group. This is also in accordance with the results from Koksal (1988) and Stucki (1999) about the correlation between the body weight of Narrow-clawed crayfish and the egg size. Such positive correlation between eggs size and carapace size were also found out by Mason (1978) for the Signal crayfish Pacifastacus leniusculus. The lineal equations showing the relationship between some exterior parameters and the size of the pleopodal eggs indicate a low positive correlation. The values of the correlation coefficient (r) are in line with the data established by Harlioglu and Turkgulu (2000). The correlation coefficient (r) between the eggs diameter and the carapace length (CL, cm) was , while the one between the egg weight and carapace length was (Harlioglu and Turkgulu, 2000). In
9 216 est egg diameter (2.4 mm) was registered in the crayfish with body weight of g and a total length of 8.2 cm, while the biggest diameter (3.7 mm) was established in crayfish with a body weight of g and a total length of 11 cm. On the other hand the smallest examined crayfish weighing g and with a total length of 7.7 cm had a diameter and weight of pleopodal eggs from 2.7 to 2.9 mm and from to g, respectively. The eggs of the biggest crayfish weighing g and with a total length of 15.4 cm have a diameter and weight from 2.8 to 3.0 mm and from to g, respectively. As with regard to the examined group of individuals from the natural population, the smallest diameter of the eggs (2.2 mm) was registered in crayfish weighing 42.6 g and with a total length of 11.4 cm, while the biggest diameter (3.4 mm) was registered in crayfish weighing g and with a total length of 13.3 cm. The smallest examined crayfish with a body weight of g and a total length of 10 cm had an egg diameter and weight from 2.5 tо 2.7 mm and from tо g, respectively. The biggest animals weighing g and with a total length of 16.7 cm have eggs with a diameter and weight from 2.7 tо 3.1 mm and from tо g, respectively. Conclusions The average pleopodal fecundity of Narrow-clawed crayfish in the pondreared population was pleopodal eggs. The individuals from the natural population have an average pleopodal fecundity of pleopodal eggs. Significant differences between the two groups have been found out in terms of this parameter. The diameter and weight of the pleopodal eggs for the cultivated population were g and 2.96 mm, respectively, whereas the values of these parameters for the natural population are g and 2.75 mm, respectively. Significantly higher are the corresponding values in the cultivated population both for the entire analyzed sample, and for the different weight groups as well. A considerable correlation between the number of the pleopodal eggs and the weight and length of the crayfish body occurred as well as for the length and width of carapace. A low correlation between the weight and diameter of the pleopodal eggs and the some exterior parameters of the body was obtains. The variation in the weight and diameter of the pleopodal eggs for the examined group of individuals was higher compared to the variation of these features for each particular individual. References P. Vasileva, A. Zaikov and T. Hubenova Abrahamsson, S. A., Density, growth and reproduction in populations of Astacus astacus and Pacifastacus leniusculus in an isolated pond. Oikos, 22: Abrahamsson, S. A., Fecundity and growth of some populations of Astacus astacus Linne in Sweden. Inst. Freshwater Res. Drottningholm, Rep. 52: Alekhnovich, A. and V. Kulesh, Comparative analysis of reproduction of Narrow-clawed crayfish, Astacus leptodactylus in its eastern area. Freshwater Crayfish, 11: Bulgurkov, K., Systematik, Biologie und zoogeographische Verbreitung der Suesswaterkrebse der Familien Astacidae und Potamonidae in Bulgarien. Procc. Zool. Ins. BAS, 10:
10 Investigation on Fecundity and Egg Size in Cultured and Natural Crayfish Population Cherkashina, N. J., On reproduction of crayfish (Astacidae) of south-eastern coast of Caspian Sea. Hydrobiological Journal, 4: (Ru). Cukerzis, J. M., Freshwater crayfish.vilnius, Mokslas Publishers, 140 pp. (Ru). Harlioglu, M. M., O. Barim, I. Turkgulu. and A. G. Harlioglu, Potential fecundity of an introduced population, Keban Dam Lake, Elazig, Turkey, of freshwater crayfish, Astacus leptodactylus leptodactylus (Esch., 1852). Aquaculture, 230: Harlioglu, M. M. and I. Turkgulu, The relationship between egg size in freshwater crayfish Astacus leptodactylus. Aquaculture International, 8: Holdich, D. M. and R. S Lowery, Freshwater crayfish: Biolology, management and exploatation. Croom Helm, London. Hubenova, T., P. Vasileva and A. Zaikov, Preliminary investigation on egg size and its dependence on some exterior features in female crayfish Astacus leptodactylus Eschscholtz, 1823 (Crustaceaa, Decapoda, Astacidae). Ann. of Sofia University St Kliment Ohridski, Faculty of Biology, book 1 Zoology, 95: Ivanova, M. and S. Vassilenko, Relationship between egg numbers, brood weight and female body weight in Crustacea. Int.Revue der gesamm. Hydrobiologie pp.72: Jarvekulg, A., Joevahk Estis. Biologia ja toonduslik tahtsus. Tartu, pp Koksal, G., The studies on embryonic and postembryonic development of Astacus leptodactylus salinus (Nordmann, 1848). Journal of Water Products (University of Ege) 1: Koksal, G., Astacus leptodactylus in Europe. In: Freshwater crayfish: Biolology, management and exploatation (Holdich, D.M. and Lowery R.S. eds.) Croom Helm, London. pp Lahti, E. and O. V Lindqvist, On the reproductive cycle of the crayfish Astacus astacus, L. in Finland. Freshwater Crayfish, 5: Lindqvist, O. V. and K. Louekari, Muscle and hepatopancreas weight in Astacus astacus L. (Crustaceae, Astacidae) in the trapping season in Finland. Ann. Zool. Fenn., 12: Mason, J. C., Significance of egg size in freshwater crayfish Pacifastacus leniusculus (Dana). Freshwater Crayfish, 4: Skvorcov, V. N., Morphoecological changeability in Narrow-clawed crayfish in ponds in Middle Ural. Ecology, 5: (Ru). Skurdal, J. and T. Qvenild, Growth, maturity and fecundity of Astacus astacus in lake Steinsfjorden, S.E.Norway. Freshwater Crayfish, 6: Stucki, T., Life cicle and life history of Astacus leptodactylus in Chatzensee pond (Zurich) and lake Ageri, Switzerland. Freshwater Crayfish, 12:
FECUNDITY OF STONE CRAYFISH AUSTROPOTAMOBIUS TORRENTIUM FROM TWO DIFFERENT POPULATIONS IN BULGARIA
387 Bulgarian Journal of Agricultural Science, (No 3) 21, 387-393 Agricultural Academy FECUNDITY OF STONE CRAYFISH AUSTROPOTAMOBIUS TORRENTIUM FROM TWO DIFFERENT POPULATIONS IN BULGARIA T. HUBENOVA, P.
More informationBODY LENGTH AND BODY WEIGHT RATIO CHARACTERISTICS OF ONE-SUMMER - OLD WELS (SILURUS GLANIS L.)
176 Bulgarian Journal of Agricultural Science, 14 (No 2) 2008, 176-181 National Centre for Agrarian Sciences BODY LENGTH AND BODY WEIGHT RATIO CHARACTERISTICS OF ONE-SUMMER - OLD WELS (SILURUS GLANIS L.)
More informationPREY SELECTIVITY IN ONE-SUMMER-OLD WELS (SILURUS GLANIS L) FED WITH CARP (CYPRINUS CARPIO) AND TOPMOUTH GUDGEON (PSEUDORASBORA PARVA)
238 Bulgarian Journal of Agricultural Science, 14 (No 2) 2008, 238-243 National Centre for Agrarian Sciences PREY SELECTIVITY IN ONE-SUMMER-OLD WELS (SILURUS GLANIS L) FED WITH CARP (CYPRINUS CARPIO) AND
More informationR E P O R T BIOLOGICAL MONITORING OF TURBOT (SCOPHTHALMUS MAXIMUS) LANDINGS AT THE BULGARIAN BLACK SEA DURING SPRING - SUMMER SEASON 2016
R E P O R T BIOLOGICAL MONITORING OF TURBOT (SCOPHTHALMUS MAXIMUS) LANDINGS AT THE BULGARIAN BLACK SEA DURING SPRING - SUMMER SEASON 2016 Agricultural Academy, Sofia Institute of Fisheries and Aquaculture,
More informationDISTRIBUTION OF CRAYFISH AND CRABS IN THE UPPER REACHES OF THE KAMCHIYA RIVER, BULGARIA
250 Bulgarian Journal of Agricultural Science, 19 (2) 2013, 250 254 Agricultural Academy DISTRIBUTION OF CRAYFISH AND CRABS IN THE UPPER REACHES OF THE KAMCHIYA RIVER, BULGARIA E. STOYNOV 1, D. PARVANOV
More informationCOMPARATIVE INVESTIGATIONS ON THE NUTRITIVE VALUE OF CARP FISH MEAT (CYPRINIDAE), GROWN AT ORGANIC AQUACULTURE CONDITIONS
127 Bulgarian Journal of Agricultural Science, 14 (No 2) 2008, 127-132 National Centre for Agrarian Sciences COMPARATIVE INVESTIGATIONS ON THE NUTRITIVE VALUE OF CARP FISH MEAT (CYPRINIDAE), GROWN AT ORGANIC
More informationSEX STRUCTURE AND FECUNDITY OF PONTIC SHAD (ALOSA IMMACULATA BENNETT, 1835) IN THE BULGARIAN SECTOR OF DANUBE
88 Bulgarian Journal of Agricultural Science, 19 (Supplement 1) 13, 88 93 Agricultural Academy SEX STRUCTURE AND FECUNDITY OF PONTIC SHAD (ALOSA IMMACULATA BENNETT, 1835) IN THE BULGARIAN SECTOR OF DANUBE
More informationA NEW RECORD OF RECENTLY DISCOVERED CRAYFISH, AUSTROPOTAMOBIUS TORRENTIUM (SHRANK, 1803), IN TURKEY
BFPP/Bull. Fr. Pêche Piscic. (2007) 387 : 01-05 1 A NEW RECORD OF RECENTLY DISCOVERED CRAYFISH, AUSTROPOTAMOBIUS TORRENTIUM (SHRANK, 1803), IN TURKEY MUZAFFER MUSTAFA HARLIOĞLU (1) * AND UTKU GÜNER (2)
More informationFecundity of guchibaim, Mastacembelus pancalus
J. Bangladesh Agril. Univ. 7(1): 133 137, 2009 ISSN 1810-3030 Fecundity of guchibaim, Mastacembelus pancalus M. M. Rahman and M. I. Miah Department of Fisheries Management, Bangladesh Agricultural University,
More informationSignal crayfish latest views from Sweden. Lennart Edsman Institute of Freshwater Research
Signal crayfish latest views from Sweden Lennart Edsman Institute of Freshwater Research Signal crayfish a little of this and some of that Lennart Edsman Institute of Freshwater Research Long and strong
More informationEFFECT OF THE LINEAL AND FAMILY BELONGING OF BROODMARES FROM THE SHAGYA BREED WITH RESPECT TO THE HEIGHT AT WITHERS AND CANNON GIRTH
359 Bulgarian Journal of Agricultural Science, 15 (No 4) 2009, 359-364 Agricultural Academy EFFECT OF THE LINEAL AND FAMILY BELONGING OF BROODMARES FROM THE SHAGYA BREED WITH RESPECT TO THE HEIGHT AT WITHERS
More informationGROWTH PARAMETERS OF THE BLACK SEA SPRAT (SPRATTUS SPRATTUS L.) DURING THE PERIOD NOVEMBER 2010 MARCH 2012 ALONG THE BULGARIAN BLACK SEA COAST
109 Bulgarian Journal of Agricultural Science, 19 (Supplement 1) 2013, 109 113 Agricultural Academy GROWTH PARAMETERS OF THE BLACK SEA SPRAT (SPRATTUS SPRATTUS L.) DURING THE PERIOD NOVEMBER 2010 MARCH
More informationTHE RELATIONSHIP BETWEEN FEMALE SIZE AND EGG SIZE IN THE FRESHWATER CRAYFISH AUSTROPOTAMOBIUS TORRENTIUM
Bull. Fr. Pêche Piscic. (2005) 376-377 : 777-785 777 THE RELATIONSHIP BETWEEN FEMALE SIZE AND EGG SIZE IN THE FRESHWATER CRAYFISH AUSTROPOTAMOBIUS TORRENTIUM I. MAGUIRE, G.I.V. KLOBUČAR, R. ERBEN Department
More informationEgg Characteristics of the Narrow-Clawed Crayfish Astacus leptodactylus under Natural Conditions in Iran
World Journal of Fish and Marine Sciences 5 (3): 296-301, 2013 ISSN 2078-4589 IDOSI Publications, 2013 DOI: 10.5829/idosi.wjfms.2013.05.03.71195 Egg Characteristics of the Narrow-Clawed Crayfish Astacus
More informationA New Design of Crayfish Traps Reduces Escaping and Improves Opportunities for Long-Term Catching
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 A New Design of Crayfish Traps Reduces Escaping and Improves Opportunities for Long-Term Catching
More information!"#$%&'() Mola mola *+,+-./
Mola mola 2008 Summary A study on the reproductive biology of ocean sunfish Mola mola Toshiyuki akatsubo 1. Introduction Ocean sunfish, Mola mola, which belongs to the family Molidae in the order Tetraodontiformes,
More informationASSESSMENT OF THE WEST COAST OF NEWFOUNDLAND (DIVISION 4R) HERRING STOCKS IN 2011
Canadian Science Advisory Secretariat Science Advisory Report 212/24 ASSESSMENT OF THE WEST COAST OF NEWFOUNDLAND (DIVISION 4R) HERRING STOCKS IN 211 Context Figure 1. Map of unit areas of NAFO Division
More informationLength-Weight Relationship and Condition Factor of Catla catla in Chhirpani Reservoir, Chhattisgarh, India
Length-Weight Relationship and Condition Factor of Catla catla in Chhirpani Reservoir, Chhattisgarh, India N. Sarang 1, A. K. Shrivas, Shweta Sao and H. K. Vardia 2 1,2 (Department of Fisheries Resource
More informationPOLYCULTURE OF LARGEMOUTH BASS (Micropterus salmoides) WITH BLUE TILAPIA (Oreochromis aurea): USING TILAPIA PROGENY AS FORAGE
POLYCULTURE OF LARGEMOUTH BASS (Micropterus salmoides) WITH BLUE TILAPIA (Oreochromis aurea): USING TILAPIA PROGENY AS FORAGE William A. Wurts a, D. Allen Davis b, Edwin H. Robinson c a Cooperative Extension
More informationCrayfish Conservation in the South West. Jen Nightingale Bristol Zoological Society
Crayfish Conservation in the South West Jen Nightingale Bristol Zoological Society White-clawed crayfish Austropotamobius pallipes Crustacean, decapod Astacidae family One of UK s largest freshwater invertebrates
More informationHerring (Clupea harengus) in subdivisions and 32 (central Baltic Sea, excluding Gulf of Riga)
ICES Advice on fishing opportunities, catch, and effort Baltic Sea Ecoregion Published 31 May 2016 8.3.14 Herring (Clupea harengus) in subdivisions 25 29 and 32 (central Baltic Sea, excluding Gulf of Riga)
More informationThe Life History of Triturus v. vittatus (Urodela) in Various Habitats
2008 Asiatic Herpetological Research, Vol. 11 pp.91 95 The Life History of Triturus v. vittatus (Urodela) in Various Habitats OREN PEARLSON 1,2,3 AND GAD DEGANI 1,2,* 1 MIGAL Galilee Technology Center,
More informationSome Biological Parameters of Bigeye and Yellowfin Tunas Distributed in Surrounding Waters of Taiwan
SCTB15 Working Paper RG-1 Some Biological Parameters of Bigeye and Yellowfin Tunas Distributed in Surrounding Waters of Taiwan Shyh-Bin Wang 1, Feng-Chen Chang 1, Shui-Hei Wang 1, and Chin-Lau Kuo 2 1
More informationA New Design of Crayfish Traps Reduces Escaping and Improves Opportunities for Long-Term Catching
Turkish Journal of Fisheries and Aquatic Sciences 17: 363-369 (217) www.trjfas.org ISSN 133-2712 DOI: 1.4194/133-2712-v17_2_15 A New Design of Crayfish Traps Reduces Escaping and Improves Opportunities
More informationGrowth of the signal crayfish, Pacifastacus leniusculus, in a small forest lake in Finland
BOREAL ENV. ENVIRONMENT RES. Vol. 7 Growth RESEARCH of Pacifastacus 7: 53 61 leniusculus in a small Finnish forest ISSN lake 1239-6095 53 Helsinki 28 March 2002 2002 Growth of the signal crayfish, Pacifastacus
More informationStudies on the gonadosomatic index and fecundity of chapila ( Gudusia chapra Ham.)
Bangladesh}. Fish. Res., 2(2), 1998: 195-2 Studies on the gonadosomatic index and fecundity of chapila ( Gudusia chapra Ham.) A.K.M.A. Kabir, M.A. Hossain\ S.M. Rahmatullah*, S. Dewan and M.S. Islam Department
More informationLake Hañcza a new site for signal crayfish (Pacifastacus leniusculus Dana) occurrence in Poland
FISHERIES & AQUATIC LIFE (2018) 26: 141-147 Archives of Polish Fisheries DOI 10.2478/aopf-2018-0015 RESEARCH ARTICLE Lake Hañcza a new site for signal crayfish (Pacifastacus leniusculus Dana) occurrence
More informationLargemouth Bass Abundance and Aquatic Vegetation in Florida Lakes: An Alternative Interpretation
J. Aquat. Plant Manage. 34: 43-47 Largemouth Bass Abundance and Aquatic Vegetation in Florida Lakes: An Alternative Interpretation MICHAEL J. MACEINA 1 INTRODUCTION Hoyer and Canfield (1996) examined relations
More informationBLACK SEA WHITING, MERLANGIUS MERLANGUS EUXINUS NORDMANN
82 BLACK SEA WHITING, MERLANGIUS MERLANGUS EUXINUS NORDMANN The taxonomic position of the Black Sea whiting like that of a great number of Black Sea fish species is rather complicated, and is still a controversial
More informationReproductive Biology of the Indian Oil Sardine Sardinella longiceps From Al-Seeb Waters off Oman
RESEARCH ARTICLE Fisheries and Aquaculture Journal, Vol. : FAJ- Reproductive Biology of the Indian Oil Sardine Sardinella longiceps From Al-Seeb Waters off Oman Fisheries and Aquaculture Journal, Vol.
More informationMORPHOMETRIC CHARACTERISTICS OF EUROPEAN GRAYLING ( YMALLUS THYMALLUS L.) IN TRANSCARPATHIAN RIVERS A. I. KUCHERUK 1 A. I. MRUK 1 V. O.
UDC 597-14:597.553.2(477) MORPHOMETRIC CHARACTERISTICS OF EUROPEAN GRAYLING ( YMALLUS THYMALLUS L.) IN TRANSCARPATHIAN RIVERS A. I. KUCHERUK 1 A. I. MRUK 1 V. O. KOVALENKO 2 1 Institute of Fisheries of
More informationCarapace Width -Weight Relationship Of Mud Crab Scylla Serrata (Forskal, 1775) Collected From Pulicat Lake, Tamilnadu, India
ISSN 2455-4499; Vol.05, Issue 01 (2016) Institute of Research Advances Pg. no. 29-33 http://research-advances.org/index.php/irajas Carapace Width -Weight Relationship Of Mud Crab Scylla Serrata (Forskal,
More informationEFFECTS OF IMPORT AND INVENTORY AMOUNTS ON CHANGES IN WHOLESALE PRICES OF SALMON IN JAPAN
EFFECTS OF IMPORT AND INVENTORY AMOUNTS ON CHANGES IN WHOLESALE PRICES OF SALMON IN JAPAN Ikutaro Shimizu National Salmon Resources Center, ikutaro@salmon.affrc.go.jp ABSTRACT Japanese salmon fishery is
More informationAACL BIOFLUX Aquaculture, Aquarium, Conservation & Legislation International Journal of the Bioflux Society
AACL BIOFLUX Aquaculture, Aquarium, Conservation & Legislation International Journal of the Bioflux Society Histological analysis of ovary development in narrow-clawed crayfish Astacus leptodactylus Esch.
More informationIntroduction. Biological Profile
Introduction Porcupine Crab (Neolithodes grimaldii) inhabits the sea bed off the Coast of Newfoundland and Labrador in depths beyond 500 fathoms (fm). This large crab is often caught as a by-catch in the
More informationEffect of Different Feeds on the Reproductive Performance of Clarias Batrachus (1758)
Universities Research Journal 2011, Vol. 4, No. 2 Effect of Different Feeds on the Reproductive Performance of Clarias Batrachus (1758) Aye Aye Cho Abstract Two types of dietary feed were prepared to evaluate
More informationCELLULAR AND HUMORAL (NON-SPECIFIC) IMMUNITY OF CARP STOCKING MATERIAL (CYPRINUS CARPIO L.) BEFORE AND AFTER WINTERING
251 Bulgarian Journal of Agricultural Science, 14 (No 2 2008, 251-255 National Centre for Agrarian Sciences CELLULAR AND HUMORAL (NON-SPECIFIC IMMUNITY OF CARP STOCKING MATERIAL (CYPRINUS CARPIO L. BEFORE
More informationWATER HYDRAULIC HIGH SPEED SOLENOID VALVE AND ITS APPLICATION
WATER HYDRAULIC HIGH SPEED SOLENOID VALVE AND ITS APPLICATION Akihito MITSUHATA *, Canghai LIU *, Ato KITAGAWA * and Masato KAWASHIMA ** * Department of Mechanical and Control Engineering, Graduate school
More informationA RADIO TELEMETRY STUDY OF MOVEMENT IN THE GIANT TASMANIAN FRESHWATER CRAYFISH, ASTACOPSIS GOULDI.
Freshwater Crayfish 14 (2004): 197-204 A RADIO TELEMETRY STUDY OF MOVEMENT IN THE GIANT TASMANIAN FRESHWATER CRAYFISH, ASTACOPSIS GOULDI. MATTHEW WEBB AND ALASTAIR RICHARDSON 1 UNIVERSITY OF TASMANIA,
More informationLength-weight relationship of horse mackerel Trachurus mediterraneus Aleev, 1956 from Bulgarian Black Sea coast
J. Black Sea/Mediterranean Environment Vol. 20, No. 1: 18 24 (2014) RESEARCH ARTICLE Length-weight relationship of horse mackerel Trachurus mediterraneus Aleev, 1956 from Bulgarian Black Sea coast Maria
More informationCOMPARATIVE STUDY OF SOME INDICES AND BODY COEFFICIENTS OF SILURUS GLANIS AND CYPRINUS CARPIO IN DIFFERENT STAGES OF DEVELOPMENT
Universitatea de Ştiinţe Agricole şi Medicină Veterinară Iaşi COMPARATIVE STUDY OF SOME INDICES AND BODY COEFFICIENTS OF SILURUS GLANIS AND CYPRINUS CARPIO IN DIFFERENT STAGES OF DEVELOPMENT Mihaela Oana
More informationTHE HOME RANGE OF SIGNAL CRAYFISH IN A BRITISH LOWLAND RIVER RUI-ZHANG GUAN AND PETER WILES
HOME RANGE OF SIGNAL CRAYFISH 45 THE HOME RANGE OF SIGNAL CRAYFISH IN A BRITISH LOWLAND RIVER RUI-ZHANG GUAN AND PETER WILES (Dr R.-Z. Guan, Xiamen Fisheries College, Jimei University, Xiamen, Fuijan 361021,
More informationGrowth performance evaluation of genetically improved silver barb (Barbonymus gonionotus Bleeker) in different agro-ecological zones in Bangladesh
Bangladesh]. Fish. Res., 12 (2), 2008: 129-134 Growth performance evaluation of genetically improved silver barb (Barbonymus gonionotus Bleeker) in different agro-ecological zones in Bangladesh A.H.M.
More informationConservation aquaculture: a critical tool for recovery of burbot in the Kootenai River
Conservation aquaculture: a critical tool for recovery of burbot in the Kootenai River Northwest Fish Culture Conference December 6-8, 2011 Ken Cain et al. Department of Fish and Wildlife and the Aquaculture
More informationAbstract 1 INTRODUCTION RESEARCH ARTICLE
Received: 19 June 216 Revised: 13 March 217 Accepted: 1 May 217 DOI: 1.12/aqc.2798 RESEARCH ARTICLE Crayfish in central and southern Ukraine with special focus on populations of indigenous crayfish Astacus
More informationPreliminary results of SEPODYM application to albacore. in the Pacific Ocean. Patrick Lehodey
SCTB15 Working Paper ALB-6 Preliminary results of SEPODYM application to albacore in the Pacific Ocean Patrick Lehodey Oceanic Fisheries Programme Secretariat of the Pacific Community Noumea, New Caledonia
More informationComparison of Catch Sizes and Reproductive Biology of Mud Crab Species of the Genus Scylla, Coexisting Populations in the Eastern Gulf of Thailand
Available online http://www.ijat-aatsea.com ISSN 1686-9141 Comparison of Catch Sizes and Reproductive Biology of Mud Crab Species of the Genus Scylla, Coexisting Populations in the Eastern Gulf of Thailand
More informationA ONE-HUNDRED-DAY CULTURE TRIAL OF THREE DIFFERENT FAMILIES OF GIFT TILPIA, OREOCHROMIS NILOTICUS
8 TH INTERNATIONAL SYMPOSIUM ON TILAPIA IN AQUACULTURE 2008 271 ZAIJIE DONG 1,2,3, PAO XU 2,3, JIE HE 2, JIAN ZHU 2,3, SHOULING ZHANG 2, ZHUANG XIE 1 1. College of Animal Science and Technology, Nanjing
More informationSprat (Sprattus sprattus) in subdivisions (Baltic Sea)
ICES Advice on fishing opportunities, catch, and effort Baltic Sea Ecoregion Published 31 May 2016 8.3.18 Sprat (Sprattus sprattus) in subdivisions 22 32 (Baltic Sea) ICES stock advice ICES advises that
More informationSAC-08-10a Staff activities and research plans. 8 a Reunión del Comité Científico Asesor 8 th Meeting of the Scientific Advisory Committee
SAC-08-10a Staff activities and research plans 8 a Reunión del Comité Científico Asesor 8 th Meeting of the Scientific Advisory Committee IATTC RESEARCH PROGRAM Four programs: A. Stock Assessment; B. Biology
More informationOBSERVATIONS ON SOME ASPECTS OF BIOLOGY OF JOHNIUS (JOHNIEOPS) VOGLERI (BLEEKER) AND PENNAHIA MACROPHTHALMUS (BLEEKER) IN THE KAKINADA REGION
/. mar. biel. Ass. India. 1986, 28 (1 & 2) : 57-62 OBSERVATIONS ON SOME ASPECTS OF BIOLOGY OF JOHNIUS (JOHNIEOPS) VOGLERI (BLEEKER) AND PENNAHIA MACROPHTHALMUS (BLEEKER) IN THE KAKINADA REGION V. SRIRAMACHANDRA
More informationDiscussion on the Selection of the Recommended Fish Passage Design Discharge
Discussion on the Selection of the Recommended Fish Passage Design Discharge Introduction The provision of fish passage is a requirement for most proposed culvert and bridge installations in Alberta, depending
More informationTHE PREVALENCE OF CRAYFISH PLAGUE (APHANOMYCES ASTACI) IN TWO SIGNAL CRAYFISH (PACIFASTACUS LENIUSCULUS) POPULATIONS IN FINLAND
JOURNAL OF CRUSTACEAN BIOLOGY, 20(4): 777 785, 2000 THE PREVALENCE OF CRAYFISH PLAGUE (APHANOMYCES ASTACI) IN TWO SIGNAL CRAYFISH (PACIFASTACUS LENIUSCULUS) POPULATIONS IN FINLAND Viljo Nylund and Kai
More informationFish Reproductive Biology
Fish Reproductive Biology OSU South Centers Piketon, Ohio Maxwell.411@osu.edu Fish Facts 32,500 estimated species of fish in the world More than 15,000 freshwater fish species Freshwater may constitute
More informationSUMMARY AND CONCLUSION. The main aim of the fish culture on commercial basis is to get
CHAPTER-8 SUMMARY AND CONCLUSION The main aim of the fish culture on commercial basis is to get high and profitable fish yields. This can only be possible through sustainable management practices without
More informationMaturity and Spawning of the Small Yellow Croaker, Larimichthys polyactis
Maturity and Spawning of the Small Yellow Croaker, Larimichthys polyactis Hyunjung Kang Kang 1, Yeonghye Kim 1, Jinkoo Kim 2, Sungyeon Kim 1, Sukgeun Jung 1, Dongwoo Lee 1 National Fisheries Research Development
More informationEstimation and Analysis of Fish Catches by Category Based on Multidimensional Time Series Database on Sea Fishery in Greece
Estimation and Analysis of Fish Catches by Category Based on Multidimensional Time Series Database on Sea Fishery in Greece Georgios Tegos 1, Kolyo Onkov 2, Diana Stoyanova 2 1 Department of Accounting
More informationGROWTH RATE AND FECUNDITY OF BLEAK (ALBURNUS ALBURNUS (L.) IN THE SAND-PIT LAKE CHEPINTSI (BULGARIA)
GROWTH RATE AND FECUNDITY OF BLEAK (ALBURNUS ALBURNUS (L.) IN THE SAND-PIT LAKE CHEPINTSI (BULGARIA) G. Raikova-Petrova 1, M. Iliev 1, I. Petrov 2 1 University of Sofia, Faculty of Biology, Department
More informationCorrelation analysis between UK onshore and offshore wind speeds
Loughborough University Institutional Repository Correlation analysis between UK onshore and offshore wind speeds This item was submitted to Loughborough University's Institutional Repository by the/an
More informationFISHERIES AND AQUACULTURE Vol. III Crustaceans - Jacques C.V Arrignon, Hans Ackefors
CRUSTACEANS Jacques C.V Arrignon Compiègne, France Hans Ackefors Department of Zoology, Stockholm University, Stockholm, Sweden Keywords: Invertebrate, Arthropod, Crustacean, Crayfish, Astacus, Cherax,
More informationRelative Size Selectivity of Trap Nets for Eight Species of Fish'
North American Journal of Fisheries Management 2:33-37, 1982 Copyright by the American Fisheries Society 1982 Relative Size Selectivity of Trap Nets for Eight Species of Fish' PERCY W. LAARMAN AND JAMES
More informationPlanning of Egg Stock Assessments According to Reproductive Characteristics of Japanese Anchovy
41 Planning of Egg Stock Assessments According to Reproductive Characteristics of Japanese Anchovy Yoshinari TSURUTA Abstract In order to enhance the accuracy of the Egg Production Method applied for Japanese
More informationASSESSMENT OF SHRIMP STOCKS IN THE ESTUARY AND GULF OF ST. LAWRENCE IN 2011
Canadian Science Advisory Secretariat Science Advisory Report 212/6 ASSESSMENT OF SHRIMP STOCKS IN THE ESTUARY AND GULF OF ST. LAWRENCE IN 211 Figure 1. Shrimp fishing areas in the Estuary and Gulf of
More informationA. Voutilainen 1,2 *
Bull. Eur. Ass. Fish Pathol., 33(6) 2013, 199 Salvelinus alpinus Diplostomum spp. A. Voutilainen 1,2 * 1 Department of Biology, University of Eastern Finland, Finland; 2 Department of Nursing Science,
More informationINVASIVE DECAPODS. LOVE THEM or HATE THEM? David Holdich
INVASIVE DECAPODS LOVE THEM or HATE THEM? David Holdich The intentional or accidental introduction of invasive species is second only to habitat destruction in causing the global loss of biodiversity.
More informationCondition Factors and Length- Weight Relationships of Pond-Cultured Paddlefish Polyodon spathula with Reference to Other Morphogenetic Relationships
JOURNAL OF THE WORLD AQUACULTURE SOCIETY Vol. 24, No. 3 September, 1993 Condition Factors and Length- Weight Relationships of Pond-Cultured Paddlefish Polyodon spathula with Reference to Other Morphogenetic
More informationStudy on the Influencing Factors of Gas Mixing Length in Nitrogen Displacement of Gas Pipeline Kun Huang 1,a Yan Xian 2,b Kunrong Shen 3,c
Applied Mechanics and Materials Online: 2013-06-13 ISSN: 1662-7482, Vols. 321-324, pp 299-304 doi:10.4028/www.scientific.net/amm.321-324.299 2013 Trans Tech Publications, Switzerland Study on the Influencing
More informationsave percentages? (Name) (University)
1 IB Maths Essay: What is the correlation between the height of football players and their save percentages? (Name) (University) Table of Contents Raw Data for Analysis...3 Table 1: Raw Data...3 Rationale
More informationMORPHOLOGY, GROWTH AND REPRODUCTION OF THE NON-INDIGENOUS TOPMOUTH GUDGEON PSEUDORASBORA PARVA
108 MORPHOLOGY, GROWTH AND REPRODUCTION OF THE NON-INDIGENOUS TOPMOUTH GUDGEON PSEUDORASBORA PARVA (TEMMINCK ET SCHLEGEL, 1846) IN THE WETLAND OF ALMA-GOL, NORTHERN IRAN 2011 Patimar R. 1, Baensaf S. 2
More informationLIFE CYCLE AND COMMUNITY STRUCTURE OF CADDISFLIES (INSECTA:TRICHOPTERA) IN THE NAVASOTA RIVER, TEXAS.
LIFE CYCLE AND COMMUNITY STRUCTURE OF CADDISFLIES (INSECTA:TRICHOPTERA) IN THE NAVASOTA RIVER, TEXAS. An Undergraduate Research Scholars Thesis by SARAH PRUSKI Submitted to Honors and Undergraduate Research
More informationReproductive biology of the tui chub, Gila bicolor, in Pyramid Lake, Nevada
Great Basin Naturalist Volume 38 Number 2 Article 6 6-30-1978 Reproductive biology of the tui chub, Gila bicolor, in Pyramid Lake, Nevada Paul A. Kucera W. F. Sigler and Associates Inc., Reno, Nevada Follow
More information.Conservation of the Fisheries of Lakes Victoria, Kyoga and Nabugabo
The Biology, Ecology,.Conservation of the Fisheries of Lakes Victoria, Kyoga and Nabugabo Nile Perch (Uganda) Project: 3P86137 Technical Report ;'. ' LAKE NABUGABO ;.r LAKE VCTORA P:O. of A85llllll'oh
More informationINFLUENCE OF ENVIRONMENTAL PARAMETERS ON FISHERY
Chapter 5 INFLUENCE OF ENVIRONMENTAL PARAMETERS ON FISHERY 5. Introduction Environmental factors contribute to the population dynamics and abundance of marine fishery. The relationships between weather,
More informationAnalysis of Signalized Intersection Crashes Nasima Bhuiyan, EmelindaM. Parentela and Venkata S. Inapuri
Analysis of Signalized Intersection Crashes Nasima Bhuiyan, EmelindaM. arentela and Venkata S. Inapuri Abstract The goals of providing high levels of mobility and intersection efficiency while simultaneously
More informationASSESSMENT OF THE WEST COAST OF NEWFOUNDLAND (DIVISION 4R) HERRING STOCKS IN 2013
Canadian Science Advisory Secretariat Quebec Region Science Advisory Report 214/56 ASSESSMENT OF THE WEST COAST OF NEWFOUNDLAND (DIVISION 4R) HERRING STOCKS IN 213 Quebec 4Ra 4S 4R 4Rc 4Rb U.S.A. (Maine)
More informationKey Words: Attraction, Color Cue, and Wavelength. Introduction
COLOR CUE AND MOVEMENT ATTRACTION OF BERMUDA BREAM DIPLODUS-BERMUDENSIS 1 Jason Silva 2, Biology Department,, 950 Main Street, Worcester, Ma 01610 (jmoreira@clarku.edu) Abstract Bermuda bream (Diplodus
More informationTHE BIOLOGY OF THE PRAWN, PALAEMON
J. mar. bio!. Ass. U.K. (1959) 38 621-627 Printed in Great Britain 621 THE BOLOGY OF THE PRAWN PALAEMON (=LEANDER) SERRA TU S (PENNANT) BY G. R. FORSTER The Plymouth Laboratory n a recent paper Cole (1958)
More informationInfluence of Fly Ash Content on Compaction Characteristics of Fly Ash Clay Mixture
Jordan Journal of Civil Engineering, Volume, No. 1, 16 Influence of Fly Ash Content on Compaction Characteristics of Fly Ash Clay Mixture Ashis Kumar Bera 1)* and Sayan Kundu 2) 1) Associate Professor
More informationComparison of the reproductive ability of varroa mites in worker and drone brood of Africanized Honey Bees
Comparison of the reproductive ability of varroa mites in worker and drone brood of Africanized Honey Bees Rafael A. Calderón F. Tropical Beekeeping Research Center (CINAT) Universidad Nacional, Costa
More informationBulgarian Journal of Agricultural Science, 19 (Supplement 1) 2013, Agricultural Academy
118 Bulgarian Journal of Agricultural Science, 19 (Supplement 1) 2013, 118 125 Agricultural Academy AGE COMPOSITION AND GROWTH RATE OF THE SPAWNING PART OF THE POPULATION OF PONTIC SHAD ALOSA IMMACULATA
More informationIs lung capacity affected by smoking, sport, height or gender. Table of contents
Sample project This Maths Studies project has been graded by a moderator. As you read through it, you will see comments from the moderator in boxes like this: At the end of the sample project is a summary
More informationA.23 RIVER LAMPREY (LAMPETRA
A. RIVER LAMPREY (LAMPETRA AYRESII) A.. Legal and Other Status The river lamprey is a Class (Watch List) California Species of Special Concern (Moyle et al., DFG 0). It has no federal status. A.. Species
More information9.4.5 Advice September Widely distributed and migratory stocks Herring in the Northeast Atlantic (Norwegian spring-spawning herring)
9.4.5 Advice September 212 ECOREGION STOCK Widely distributed and migratory stocks Herring in the Northeast Atlantic (Norwegian spring-spawning herring) Advice for 213 ICES advises on the basis of the
More informationWATER LEVEL VARIATIONS FOR EGG HATCHABILITY AND LARVAL SURVIVAL OF KELABAU FISH (Osteochilus melanopleura Blkr)
TWJ VOLUME 2 No.3 NOVEMBER 2016 ISSN : 2338-7653 WATER LEVEL VARIATIONS FOR EGG HATCHABILITY AND LARVAL SURVIVAL OF KELABAU FISH (Osteochilus melanopleura Blkr) Rukmini Department of Aquaculture, Faculty
More informationCambarellus (Dirigicambarus) shufeldtii (Faxon) 1884 Cajun dwarf crayfish
Cambarellus (Dirigicambarus) shufeldtii (Faxon) 1884 Cajun dwarf crayfish Photo by C. Lukhaup Distribution, Habitat, and Behavior Cambarellus shufeldtii is widely distributed in the Gulf Coastal Plain,
More informationMonitoring the length structure of commercial landings of albacore tuna during the fishing year
SCTB15 Working Paper ALB-5 Monitoring the length structure of commercial landings of albacore tuna during the 2001 2002 fishing year Linda Griggs National Institute of Water and Atmospheric Research Ltd.
More informationWest Coast Rock Lobster. Description of sector. History of the fishery: Catch history
West Coast Rock Lobster Description of sector History of the fishery: The commercial harvesting of West Coast rock lobster commenced in the late 1800s, and peaked in the early 1950s, yielding an annual
More informationPertanika J. Trop. Agric. Sci. 38 (2): (2015)
Pertanika J. Trop. Agric. Sci. 38 (2): 211-217 (2015) TROPICAL AGRICULTURAL SCIENCE Journal homepage: http://www.pertanika.upm.edu.my/ Length-Weight Relationship and Relative Condition Factor of Parapenaeopsis
More informationA SPEED-FLOW MODEL FOR AUSTRIAN -MOTORWAYS
A SPEED-FLOW MODEL FOR AUSTRIAN -MOTORWAYS Dr. Hassan Mahdy Public Works Dept., Faculty of Engineering Ain Shams University, Cairo, Egypt. E-mail: h98417@hotmail.com ABSTRACT Conventional speed-flow models
More information23 WHITE CLAWED CRAYFISH SPECIES ACTION PLAN
23 WHITE CLAWED CRAYFISH SPECIES ACTION PLAN 23.1 INTRODUCTION The native crayfish Austropotamobius pallipes (Lereboullet) occupies a wide range of habitats including streams, rivers, lakes, reservoirs
More informationINFLUENCE OF TRAFFIC FLOW SEPARATION DEVICES ON ROAD SAFETY IN BRAZIL S MULTILANE HIGHWAYS
INFLUENCE OF TRAFFIC FLOW SEPARATION DEVICES ON ROAD SAFETY IN BRAZIL S MULTILANE HIGHWAYS Gabriel Andrade Lanzaro Universidade de Brasília Departamento de Engenharia Civil e Ambiental, Faculdade de Tecnologia,
More informationDetermining the Effects of a Trematode Parasite, Microphallus spp., on. Rusty Crayfish (Orconectes rusticus) Fecundity
Hogan 1 Determining the Effects of a Trematode Parasite, Microphallus spp., on Rusty Crayfish (Orconectes rusticus) Fecundity 35502: Practicum in Environmental Field Biology Sara Hogan Advisor: Lindsey
More informationCrayfish 101: An Introduction to Crayfish Biology and Identification. Tyler Black, Ph.D. and T. R. Russ NC Wildlife Resources Commission
Crayfish 101: An Introduction to Crayfish Biology and Identification Tyler Black, Ph.D. and T. R. Russ NC Wildlife Resources Commission What s a Crawdad? Agenda Information Classification/Distribution
More informationDOI /HORIZONS.B P23 UDC : (497.11) PEDESTRIAN CROSSING BEHAVIOUR AT UNSIGNALIZED CROSSINGS 1
DOI 10.20544/HORIZONS.B.03.1.16.P23 UDC 656.142.054:159.922(497.11) PEDESTRIAN CROSSING BEHAVIOUR AT UNSIGNALIZED CROSSINGS 1 JelenaMitrovićSimić 1, Valentina Basarić, VukBogdanović Department of Traffic
More informationEvaluation passenger car unit for motorcycle in Indonesia Highway Capacity Manual (Case study: Bandung and Semarang)
Evaluation passenger car unit for motorcycle in Indonesia Highway Capacity Manual (Case study: Bandung and Semarang) Najid 1,* 1 Tarumanegara University, Department Civil Engineering, Jakarta, Indonesia
More informationPreliminary study on feeding habits and condition factor of Salmo trutta macrostigma (Dumeril, 1858) in Karasu River
International Journal of Nature and Life Sciences (IJNLS) https://www.journalnatureandlifesci.com ISSN: Online Vol. 1(1), June 2017, pp. 17-21 Preliminary study on feeding habits and condition factor of
More informationThe effects of v-notching on reproductive potential in American lobsters (Homarus americanus) in Newfoundland
The effects of v-notching on reproductive potential in American lobsters (Homarus americanus) in Newfoundland Kathryn Goetting adapted from The reproductive potential of v-notched American lobsters (Homarus
More informationAbstract. The aim of this study was to determine the size and age compositions, growth
Abstract The aim of this study was to determine the size and age compositions, growth rates, reproductive biology, dietary compositions and mesh selectivity of the King George whiting Sillaginodes punctata,
More informationUNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Subsidiary Level and Advanced Level
UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Subsidiary Level and Advanced Level *5466176767* MARINE SCIENCE 9693/03 Structured Questions May/June 2011 Paper
More informationElectrofishing and kick seining efforts for invasive signal crayfish (Pacifastacus leniusculus) on Kodiak Island, Alaska
Electrofishing and kick seining efforts for invasive signal crayfish (Pacifastacus leniusculus) on Kodiak Island, Alaska Kelly Krueger, Sun aq Tribe of Kodiak Signal crayfish (Pacifastacus leniusculus),
More information