THE OCCURRENCE OF ANGUILLICOLA CRASSUS (KUWAHAR, NIMI, AND HAGAKI, 1974), AN INTRODUCED NEMATODE, IN AN UNEXPLOITED WESTERN IRISH EEL POPULATION
|
|
- Arleen Higgins
- 6 years ago
- Views:
Transcription
1 THE OCCURRENCE OF ANGUILLICOLA CRASSUS (KUWAHAR, NIMI, AND HAGAKI, 1974), AN INTRODUCED NEMATODE, IN AN UNEXPLOITED WESTERN IRISH EEL POPULATION M. Morrissey and T.K. McCarthy ABSTRACT The presence of Anguillicola crassus, an introduced Asian parasite of eels, into south Connemara is reported. European eels Anguilla anguilla were found to be infected in the three basins of varying salinity of Lough Ahalia, but eels sampled in the nearby marine Camus Bay were uninfected. Variations in infection parameters were analysed. It was concluded that the parasite is a recent introduction to the river system. The highest prevalence (63.1%) and mean intensity (4.22) of infection in the lower, most saline, basin of the lough suggest that the parasite was introduced to the River Screebe system at that location. Potential dispersal mechanisms by which the parasite may have been introduced to such a relatively isolated location and to such apparently unexploited eel populations are discussed. M. Morrissey (corresponding author morrissey. michelle@gmail.com) and T.K. McCarthy, Department of Zoology, National University of Ireland, Galway, Ireland. Received 21 April Accepted 10 September Published 12 February INTRODUCTION The swimbladder-inhabiting nematode Anguillicola crassus (Kuwahar, Nimi, and Hagaki, 1974) is an eelspecific parasite, accidentally introduced into Europe in the early 1980s through uncontrolled transfer of live eels from Eastern Asia (Neumann 1985). Presence of the parasite can induce pathogenic changes in the swimbladder and reduce the ability of the eel to withstand additional stressors (Kirk 2003). Anguillicola crassus was first recorded in Ireland from eels captured in the Waterford Estuary in 1997 (McCarthy et al. 1999). Since then it has become well established in several commercially exploited Irish eel fisheries such as those on the Shannon and Erne river systems (Evans and Matthews 1999; McCarthy et al. 1999), Lough Corrib, Lough Neagh and the Nore, Barrow, Suir and Slaney Rivers (McCarthy et al., in press). As part of a larger investigation of the population biology of European eels (Anguilla anguilla L.) in Irish marine and mixohaline waters, samples from unexploited eel populations in south Connemara were found to be infected with A. crassus. In this paper we detail and analyse the A. crassus infection parameters recorded. STUDY AREA European eels Anguilla anguilla were sampled along a short /2km salinity gradient in Lough Ahalia and in Camus Bay, western Ireland (Fig. 1). Lough Ahalia, a coastal lagoonal lake (Healy 2003), consists of three basins forming the lower reaches of the River Screebe catchment. The system flows into the Atlantic via Camus bay. The upper basin of Lough Ahalia (surface area /40ha, mean depth 1.7m) is freshwater (0.1 ); the middle basin (surface area /60ha, mean depth 2.5m) is brackish (12 ), receiving bi-monthly tidal inputs of saline water (i.e. on spring tides); the lower basin (surface area /25ha, mean depth 1.6m) is more influenced by the tides and receives a twice-daily influx of tidal water, which leads to near full marine salinities (25 ). Camus Bay is fully saline (34 ). The site was chosen because of the relatively steep salinity gradient over a small distance, but more importantly, because there is no exploitation of the eel population. MATERIALS AND METHODS Samples of yellow eel were obtained from the four salinity zones (upper basin, middle basin, lower basin and Camus Bay) during October 2004, using unbaited fyke nets. Fyke nets were set at dusk and lifted the following morning. Eels were transferred on ice to the lab where they were measured (total length, to the nearest millimetre), and weighed (to the nearest gram). An index of condition was calculated using Fulton s condition factor BIOLOGY AND ENVIRONMENT: PROCEEDINGS OF THE ROYAL IRISH ACADEMY, VOL. 107B, NO. 1, (2007). # ROYAL IRISH ACADEMY 13
2 BIOLOGY AND ENVIRONMENT Fig. 1* Map of Ireland showing the location of Lough Ahalia and Camus Bay. K (100W L T 3 ). Sex determination was by macroscopic examination of the gonads (Beullens et al. 1997). The swimbladder was removed, and A. crassus present in the swimbladder lumen were removed and counted as described by Gollock et al. (2004) and Molnár et al. (1993). Parasitological terms (prevalence and mean intensity) are used in accordance with Bush et al. (1997). Prevalences were compared by Fishers exact test, and mean intensities were compared using a Bootstrap 2 sample test (Rózsa et al. 2000). In both cases differences were considered significant if P B/0.05. RESULTS Descriptive statistics for length and weight and condition of eels from the four sites are shown in Table 1. Analysis of variance showed that mean log-transformed (log (x)) lengths of eels in the four sites were significantly different (F /4.002, P B/ 0.05) and post hoc analysis (LSD) showed that the differences occurred in eels between Camus Bay and the lower and upper basins of Lough Ahalia (P B/0.05). There was a significant difference in log-transformed weight between the four sites Table 1* Summary statistics for eel length, weight and condition from the upper, middle and lower basins of Lough Ahalia and Camus Bay. Site Upper Middle Lower Camus Bay Total No. of eels Length (mm) Min Max Mean SD Weight (g) Min Max Mean SD Condition Min Max Mean SD
3 THE OCCURRENCE OF ANGUILLICOLA CRASSUS (ANOVA; F/3.296, P B/0.05), and the LSD test showed the lower basin of Lough Ahalia was significantly different to the middle basin and Camus Bay (P/0.05). There was a significant difference in square-root-transformed condition between the four sites (ANOVA; F/4.021, P B/ 0.05), and the LSD test showed that the differences occurred in eels from Camus Bay and those from the lower and upper basins of Lough Ahalia (P B/0.05). Details of the infection levels of A. crassus recorded in eels in the four sampling sites expressed as prevalence (% infected), mean intensity (mean number per infected host) and maximum burden are given in Table 2. Anguillicola crassus was not found in eels examined from Camus Bay. Prevalence and mean intensities were highest in the lower basin of Lough Ahalia and decreased from lower to middle to upper basins of Lough Ahalia. There was a significant difference in both prevalence (P B/0.05) and mean intensity (P B/ 0.05) between the middle and lower basin. Sex was determined for all eels (n/301). An overall predominance of females (88%) was observed (n /265). There was no significant difference in sex ratios between the 4 sites (x 2 / 7.63, d.f. /3, P /0.054). Table 2 also displays mean intensity of infection, prevalence and maximum burden of A. crassus in male and female eels for the total sample and from the middle basin and the lower basin, where levels of infection were highest. Overall, levels of infection were higher in males than females. Levels of infection were compared between males and females in the middle and lower basins. In the middle basin there was a significant difference in prevalence (P B/0.05), with males having a higher prevalence than females but not a greater mean intensity (P/ ). In the lower basin there was no significant difference between the sexes with regard to prevalence (P/0.304) or mean intensity (P/ ). Variation in infection intensity between length classes is shown in Fig. 2. Spearman rank order correlations showed a highly significant negative correlation between length of eel and number of A. crassus present in the middle basin (r s //0.252, P B/0.05) and no correlation in the lower basin (r s / 0.070, P/0.578). Though not systematically investigated during the present study, damage to the swimbladder wall was frequently observed in eels infected with A. crassus. There was no significant correlation between Fulton s condition factor (K) of eels and their parasite burdens in either the middle basin (r s //0.018, P/0.845) or lower basin (r s / 0.201, P /0.108). Because smaller eels in the middle basin tended to have more parasites, both male and females in the smallest length class ( B/400mm) from this basin were compared to investigate whether there was a relationship between sex and intensity of infection. A significant difference was found between males (n /15) and females (n /32) B/400mm, with males having a higher intensity of infection than females in the same size range (x 2 / df /4, P B/0.05). The variance-to-mean ratio (/s 2 =x) of parasite abundance was calculated to provide an index of the degree of dispersion of A. crassus among individual host eels. A ratio of /1 indicates overdispersion, a ratio equal to 1 indicates random distribution in the parasite, and a ratio of B/1 indicates underdispersion (Anderson and Gordon 1982). The variance-tomean ratios were both /1, indicating overdispersion (middle basin s 2 =x /2.28 and lower basin s 2 =x / 5.63). The abundance of A. crassus in eels displayed a negative binomial distribution in both the middle Table 2* Anguillicola crassus maximum burden, % prevalence and mean intensity for total sample of eels (in bold) and male and females separately, sampled from the upper, middle and lower basins of Lough Ahalia and Camus Bay. Site No. of eels Infected eels Max. burden Prevalence (%) Mean intensity Upper Female Male Middle Female Male Lower Female Male Camus Bay Female Male
4 BIOLOGY AND ENVIRONMENT Mean number of parasite ± 95%CI Middle Basin Lower Basin Length class (mm) Fig. 2* Variation of Anguillicola crassus intensity with eel length class in middle and lower basin. (k/0.465) and lower basin (k/0.556) (Fig. 3a and 3b). DISCUSSION Anguillicola crassus, accidentally introduced from Asia in the 1980s, has been progressively expanding its range in the eel-inhabited inland waters of Europe. Its dissemination has been linked to the extensive commercial transport of live eels and re-stocking of eel fisheries with infected fish, as well as natural movements of infected eels (Kennedy and Fitch 1990; Wickströem et al. 1998; Kirk 2003). Its arrival in Ireland in the 1990s and its subsequent colonisation of major eel fisheries has been documented by McCarthy et al. (in press). The discovery that eels in the relatively isolated lower River Screebe area are now infected suggests that the species is progressively extending its range in Ireland and that a better understanding of its dispersal routes and mechanisms is needed. The parasite is recognised as being pathogenic in the European eel, with adverse effects on affected swimbladders and on various other aspects of eel physiology having been recorded (Kirk 2003). Despite the damage caused by A. crassus to swimbladders of eels noted in the present study, infected eels generally appeared to be in good condition. Thus, in the present study, no correlation was observed between Fulton s condition factor (K) and parasite burden in Lough Ahalia. However, such eels are likely to have their capacity to migrate to the Sargasso spawning area adversely affected by their A. crassus infections. As demonstrated in experimental studies on Dutch silver eels, A. crassus can reduce the swimming speeds and increase the metabolic cost of silver eel migration (EELREP 2005). The observations made on the infection levels of A. crassus in Lough Ahalia eels (Table 2) suggest that they were initially introduced to the mixohaline lower basin and that, as indicated by the progressively lower infection parameters in the middle and upper basins, the parasite has been gradually spreading towards the freshwater areas upstream. A car parking area adjacent to Screebe Bridge, where Lough Ahalia discharge connects to Camus Bay, may have enabled someone transporting live eels to exchange water in their transport tanks. This practice was commonly undertaken by commercial eel dealers in the past. Alternatively, even though no authorisations have been granted by the fishery owner or licenses issued for that area by the Western Regional Fishery Board for over eight (a) 100 n = 121 Observed Expected (b) 100 n = 65 Observed Expected % frequency % frequency Number of A. crassus Number of A. crassus Fig. 3* Percentage frequency of Anguillicola crassus in eels from (a) the middle and (b) the lower basin of Lough Ahalia. 16
5 THE OCCURRENCE OF ANGUILLICOLA CRASSUS years, it is known that some illegal fishing for eels occasionally occurs in the area. It is possible that transport of eel catches between river basins by such fishermen resulted in the spread of A. crassus to the Screebe system. Dispersal by natural mechanisms from River Corrib basin, where A. crassus is well established, seems less likely. A cormorant colony located on an island in the upper basin of Lough Ahalia might have a role in extending the distribution of A. crassus through fish regurgitation, involving infected eels or paratenic hosts, as has been shown in Polish studies (Wlasow et al. 1998). However, observations on flight direction adopted by foraging birds suggest that they do not regularly forage in the Corrib system. Likewise, though theoretically possible, it is unlikely that the initial colonisation of the Screebe River system resulted from natural movements of infected eels or paratenic hosts. The need to consider such possibilities is suggested by recent observations on the variety of migratory strategies adopted by eel species in which local movements between waters of differing salinities can occur throughout the yellow eel foraging phase of the eel life cycle (Harrod et al. 2005). Eels from Camus Bay examined in this study (Table 2) were found not to be infected with A. crassus, suggesting that colonisation of the Lough Ahalia eel populations did not occur through eels migrating into the system from the marine environment. The spread of A. crassus within the system may have been facilitated by the natural movement of eels between the Lough Ahalia basins (Harrod et al. 2005). Parasite infections typically vary among size classes of their fish hosts, and differences in transmission rates often reflect ontogenic trophic niche shifts. Various studies have shown that larger eels tend to have higher numbers of A. crassus than smaller eels (Audenaert et al. 2003; Schabuss et al. 2005). However, in the Lough Ahalia middle basin samples, A. crassus abundance was negatively correlated with eel size. This may reflect unusual features of the habitat and the trophic ecology of its eels. Piscivory is typical of eels greater than 50cm in length in many freshwater habitats. However, limited observations on stomach contents of the eels captured in the marine and mixohaline habitats sampled in Camus Bay and Lough Ahalia suggests that larger prey items are more likely to be crabs, such as the euryhaline Carcinus maenas. Larger eels typically do not feed directly on copepods, such as those bearing infective A. crassus larvae, but can be infected by preying on fish fry containing numerous recently ingested copepods (Kirk 2003). Unlike most European habitats colonised by A. crassus, the Screebe system is characterised by having relatively species-poor fish assemblages. In this respect it is typical of smaller western Irish rivers and lakes, where cyprinids and other nonindigenous coarse fish are generally absent. Results of stable isotope analyses of eels from the three basins of Lough Ahalia suggested that the trophic niche occupied by eels in the middle basin was narrower than either of the other basins (Harrod et al. 2005). This may be due to limited fish prey, although it may also reflect food web changes associated with the presence of salmon-rearing cages in that lake basin. Interestingly males had more parasites than females of the same size class in the middle basin. However, whether this resulted from differences in trophic ecology, inter-habitat movements or other factors is unclear. Several of the euryhaline species present in the lower basin and in nearby Camus Bay, are listed among the more than 37 species recorded as paratenic hosts for A. crassus (Höglund and Thomas 1992; Szekely 1994; Kirk 2003). The higher prevalence of A. crassus in the lower basin of Lough Ahalia may be due to ingestion of infected paratenic hosts by eels. The absence of A. crassus in the eels sampled in Camus Bay may be explained by research that has shown that the parasite prefers lower salinities (Kennedy and Fitch 1990). However, adult nematodes can survive within eels in the marine environment by osmoconforming with the blood plasma of the eel (Kirk et al. 2002), so their absence from Camus Bay may not be entirely due to salinity. A further explanation may be the lack of available intermediate hosts, which is a known factor to limiting the spread of A. crassus (Kirk et al. 2000). Concerns have been expressed about the negative impact A. crassus may have on the capacity of eels to undertake their oceanic spawning migrations. It has been suggested that A. crassus parasitism may be contributing to the dramatic decline that has occurred in European eel stocks in recent decades (Køie 1991). Therefore, more systematic analyses of dispersal and pathogenic effects are needed. As indicated by Kirk 2003, relatively little is known about A. crassus in coastal and brackish water habitats, with the exception of studies on exploited Baltic eel populations and some other local studies on estuarine habitats. McCarthy et al. (in press) reviewed available information on parasites of Irish eels and highlighted the need for parasitological research on eels in marine and mixohaline waters. The results of the present study, while providing new information on this species in Ireland and contributing to knowledge of eel ecology in mixohaline waters, also suggest that further investigations on A. crassus transmission in such habitats are needed. 17
6 BIOLOGY AND ENVIRONMENT ACKNOWLEDGEMENTS This study was funded as part of the HEA-PTRLI Cycle 3 project Population Biology of Eels in Marine and Mixohaline Waters. We would like to thank Dr Chris Harrod for help with fieldwork and the Screebe Fishery for allowing us to sample the eel populations of Lough Ahalia. REFERENCES Anderson, R.M. and Gordon, D.M Processes influencing the distribution of parasite numbers within host populations with special emphasis on parasite-induced host mortalities. Parasitology 85, Audenaert, V., Huyse, T., Goemans, G., Belpaire, C. and Volckaert, F.A.M Spatio-temporal dynamics of the parasitic nematode Anguillicola crassus in Flanders, Belgium. Diseases of Aquatic Organisms 56, Beullens, K., Eding, E.H., Gilson, P., Ollevier, F., Komen, J. and Richter, C.J.J Gonadal differentiation, intersexuality and sex ratios of European eel (Anguilla anguilla) maintained in captivity. Aquaculture 153, Bush, A.O., Lafferty, K.D., Lotz, J.M. and Shostak, A.W Parasitology meets ecology on its own terms: Margolis et al. revisited. Journal of Parasitology 83, EELREP 2005 Final report: estimation of the reproduction capacity of European eel. pp (EU-project EELREP (Q5RS )). Evans, D.W. and Matthews, M.A Anguillicola crassus (nematoda, Dracunculoidea); first documented record of this swimbladder parasite in eels in Ireland. Journal of Fish Biology 55, Gollock, M.J., Kennedy, C.R., Quabius, S.E. and Brown, A.J The effect of parasitism of European eels with the nematode, Anguillicola crassus, on the impact of netting and arial exposure. Aquaculture 233, Harrod, C., Grey, J., McCarthy, T.K. and Morrissey, M Stable isotope analyses provide new insights into ecological plasticity in a mixohaline population of European eel. Oecologia 144, Healy, B Coastal lagoons. In M.L. Otte (ed.), Wetlands of Ireland. Distribution, ecology and economic value, Dublin. University College Dublin. Höglund, J. and Thomas, K The black goby Gobius niger as a potential paratenic host for the parasitic nematode Anguillicola crassus in a thermal effluent of the Baltic. Diseases of aquatic organisms 13, Kennedy, C.R. and Fitch, D.J Colonization, larval survival and epidemology of the nematode Anguillacola crassus, parasitic in the eel, Anguilla anguilla, in Britain. Journal of Fish Biology 36, Kirk, R.S The impact of Anguillicola crassus on European eels. Fisheries Management and Ecology 10, Kirk, R.S., Lewis, J. W. and Kennedy, C.R Survival and transmission of Anguillicola crassus Kuwahara, Niimi and Itagaki, 1974 (Nematoda) in seawater eels. Parasitology 120, Kirk, R.S., Morritt, D., Lewis, J.W. and Kennedy, C.R The osmotic relationship of the swimbladder nematode Anguillicola crassus with seawater eels. Parasitology 124, Køie, M Swimbladder nematodes (Anguillicola spp.) and gill monogeneans (Pseudodactylogyrus spp.) parasitic on the European eel (Anguilla anguilla). Journal du Conseil International pour l Exploration de la Mer 47, McCarthy, T.K., Creed, K., Naughton, O., Cullen, P. and Copley, L. in press The metazoan parasites of eels (Anguilla anguilla) in Ireland: zoogeographical, ecological and fishery management perspectives. In J. Casselman and D. Cairns (eds), American Fisheries Society Symposium series. McCarthy, T.K., Cullen, P. and O Connor, W The biology and management of River Shannon eel populations. Fisheries Bulletin (Dublin) 17. Molnár, K., Baska, F., Csaba, G., Glávatis, R. and Székely, C Pathological and histopathological studies of the swimbladder of eels Anguilla anguilla infected by Anguillicola crassus (Nematoda:Dranunculoidea). Diseases of Aquatic Organisms 15, Neumann, W Schwimmblasenparasit Anguillicola bei Aalen. Fischer Teichwirt 11, 322. Rózsa, L., Reiczigel, J. and Majoros, G Quantifying parasites in samples of hosts. Journal of Parasitology 86, Schabuss, M., Kennedy, C.R., Konecny, R., Grillitsch, B., Reckendorfer, W., Schiemer, F. and Herzig, A Dynamics and predicted decline of Anguillicola crassus infection in European eels, Anguilla anguilla, in Neusiedler See, Austria. Journal of Helminthology 79, Szekely, C.S Paratenic hosts for the parasitic nematode Anguillicola crassus in Lake Balaton, Hungary. Diseases of Aquatic Organisms 18, Wickströem, H., Clevestam, P. and Höglund, J The spreading of Anguillicola crassus in freshwater lakes in Sweden. Bulletin Francais de la Pêche et de la Pisciculture 349, Wlasow, T., Gomulka, P., Martyniak, A., Boron, S., Hliwa, P., Terelecki, J. and Szymanska, U Anguillicola crassus larvae in cormorant s prey fish in Vistula Lagoon, Poland. Bulletin Francais de la Pêche et de la Pisciculture 349,
Metazoan parasites of European eel. Dalyan estuarine channel system, Turkey
Bull. Eur. Ass. Fish Pathol., 32(5) 2012, 159 Metazoan parasites of European eel (Anguilla anguilla Dalyan estuarine channel system, Turkey S. Özesen Çolak 1 *, E. Soylu 2 3 3 1 Istanbul University, Fisheries
More informationInfection of European eel, Anguilla anguilla (L.), with the nematode Anguillicoloides crassus (Kuwahara, Niimi et Itagaki, 1974) in Polish waters
Polish Journal of Veterinary Sciences Vol. 15, No. 2 (2012), 253-257 DOI 10.2478/v10181-011-0142-4 Original article Infection of European eel, Anguilla anguilla (L.), with the nematode Anguillicoloides
More informationReport on a Salmon Survey in the Waterford Estuary in 2010
Report on a Salmon Survey in the Waterford Estuary in 2010 Dr. P. Gargan Inland Fisheries Ireland June 2011 1 Contents 1. Introduction 3 2. Proposal for a Survey in Waterford estuary in 2010 3 3. Survey
More information2. Scientific investigation of eel in Belarus, achievements
Role of the Republic of Belarus in conservation of the European eel world population Victor K. Rizevsky, Mikhail V. Pliuta,Vladimir V. Koltunov Scientific and Practical Center of the National Academy of
More informationWater Framework Directive Fish Stock Survey of Lickeen Lough, September 2013
1 Water Framework Directive Fish Stock Survey of Lickeen Lough, September 2013 Fiona L. Kelly, Lynda Connor, Emma Morrissey, John Coyne, Ronan Matson, Rory Feeney and Kieran Rocks Inland Fisheries Ireland,
More informationApplied policy in the Mediterranean lagoons
Applied policy in the Mediterranean lagoons Dr. A. Kallianiotis National Agricultural Research Foundation Fisheries Research Institute Nea Peramos, Greece Web site: www.fishri.gr Main characteristics in
More informationELECTRO-FISHING REPORT 2016 UPPER TWEED
ELECTRO-FISHING REPORT 2016 UPPER TWEED The electro-fishing programme carried out each summer by The Tweed Foundation is part of our management plan, which details the information that is required to manage
More informationEuropean Smelt (Osmerus eperlanus L.) Baseline Surveys on the River Foyle, River Finn, River Deele & Burndennet River
2010 European Smelt (Osmerus eperlanus L.) Baseline Surveys on the River Foyle, River Finn, River Deele & Burndennet River Loughs Agency of the Foyle Carlingford and Irish Lights Commission Report Ref:
More informationOfficial Journal of the European Union L 248/17
22.9.2007 Official Journal of the European Union L 248/17 COUNCIL REGULATION (EC) No 1100/2007 of 18 September 2007 establishing measures for the recovery of the stock of European eel THE COUNCIL OF THE
More informationDistribution, prevalence and intensity of Anguillicoloides crassus in the American eel, Anguilla rostrata, in the Bras d Or Lakes, Nova Scotia
BioInvasions Records (2013) Volume 2, Issue 1: 19 26 doi: http://dx.doi.org/10.3391/bir.2013.2.1.03 2013 The Author(s). Journal compilation 2013 REABIC Open Access Research Article Distribution, prevalence
More informationSTUDY PERFORMANCE REPORT
STUDY PERFORMANCE REPORT State: Michigan Project No.: F-80-R-7 Study No.: 230654 Title: Evaluation of brown trout and steelhead competitive interactions in Hunt Creek, Michigan. Period Covered: October
More informationStillwater Status Report: Lough Muck, County Donegal
LOUGHS AGENCY OF THE FOYLE CARLINGFORD AND IRISH LIGHTS COMMISSION Stillwater Status Report: Lough Muck, County Donegal Stillwater Fish Stock Survey Loughs Agency of the Foyle Carlingford and Irish Lights
More informationMonitoring of sea trout post-smolts, 2012
Monitoring of sea trout post-smolts, 2012 A report to the West Sutherland Fisheries Trust, Report No. WSFT2/13 January 2013 Shona Marshall Fisheries Biologist West Sutherland Fisheries Trust Gardeners
More informationAn Roinn Turasoireachta, lascaigh. agus Foraoiseachta THE IMPACT OF EEL FYKE NETTING ON OTHER FISHERIES
" An Roinn Turasoireachta, lascaigh agus Foraoiseachta THE IMPACT OF EEL FYKE NETTING ON OTHER FISHERIES Christopher Moriarty 1'1, I " I,' i l,i,! ill I!'I: " I III "!'I :,11 'I, I li,'1 li'[11 ill ':Ii
More informationWater Framework Directive Fish Stock Survey of Glencar Lough, August 2013
1 Water Framework Directive Fish Stock Survey of Glencar Lough, August 2013 Fiona L. Kelly, Lynda Connor, Emma Morrissey, John Coyne, Ronan Matson, Rory Feeney and Kieran Rocks Inland Fisheries Ireland,
More informationVARIABILITY IN GROWTH RATE IN EUROPEAN EEL ANGUILLA ANGUILLA (L.) IN A WESTERN IRISH CATCHMENT
VARIABILITY IN GROWTH RATE IN EUROPEAN EEL ANGUILLA ANGUILLA (L.) IN A WESTERN IRISH CATCHMENT W. Russell Poole and Julian D. Reynolds ABSTRACT The length, age and growth rate of female silver eels trapped
More information311B Lewis Hall P.O. Box 168 Bozeman, MT Yellowstone National Park, WY 82190
Relating Myxobolus cerebralis infection in native Yellowstone cutthroat trout and Tubifex tubifex with environmental gradients at multiple spatial scales Principle Investigators: Dr. Billie L. Kerans Dr.
More informationWe would also like to thank Dr. Martin O Grady (CFB) and No. 3 Operational Wing, Irish Air Corps (Aer Chór na héireann) for the aerial photographs.
ACKNOWLEDGEMENTS The authors wish to gratefully acknowledge the help and co-operation of the acting CEO Dr. Milton Matthews and staff of the Northern Regional Fisheries Board. The authors would also like
More informationThe development of novel sampling protocols for endangered fish species in Irish lakes: Trials and Triumphs Inland Fisheries Ireland
The development of novel sampling protocols for endangered fish species in Irish lakes: Trials and Triumphs Inland Fisheries Ireland Emma Morrissey Overview 15 minute presentation: The idea Introduction
More informationMigration, Behaviour and Habitat Selection by Anadromous Brook Trout, Salvelinus fontinalis (Mitchell), in a Nova Scotia Southern Upland:
Migration, Behaviour and Habitat Selection by Anadromous Brook Trout, Salvelinus fontinalis (Mitchell), in a Nova Scotia Southern Upland: FFRC Year-End REPORT E.A. Halfyard Dalhousie University and the
More informationEel management in Sweden Håkan Westerberg. Fiskeriverket
Eel management in Sweden Håkan Westerberg Fiskeriverket The Swedish eel fishery Yellow eel on the west-coast Silver eel in the Baltic and inland lakes Predominantly coastal fishery (85 % of landings) Commercial
More informationCouncil CNL(11)35. Annual Report on Actions Taken Under Implementation Plans. EU - France
Agenda Item 6.1 For Information Council CNL(11)35 Annual Report on Actions Taken Under Implementation Plans EU - France Annual Report on actions taken under Implementation Plans for the Calendar Year
More informationMatching bird diets with fish data: New insight into avian predation in the Columbia River estuary
Matching bird diets with fish data: New insight into avian predation in the Columbia River estuary Laurie Weitkamp and Tom Good NOAA Fisheries, Northwest Fisheries Science Center Don Lyons and Dan Roby
More informationand found that there exist a significant overlap between the billfish resources and the exploitation activities targeting tunas and mahi mahi.
Executive Summary Report 2016 Billfish Research in the Eastern Pacific Ocean Rosenstiel School of Marine and Atmospheric Science University of Miami January 2017 During 2016, the Eastern Pacific Ocean
More informationManagement of eel species: a modelling problem
Management of eel species: a modelling problem Marcello Schiavina* Politecnico di Milano, Università degli Studi di Parma * email: m.schiavina@gmail.com Introduction: a good management A good management
More informationSEA GRANT PROGRESS REPORT
SEA GRANT PROGRESS REPORT Project Title: The relationship between seasonal migrations of berried female lobster Homarus americanus, egg development and larval survival. Principal Investigator: Winsor H.
More informationLect 19 - Populations - Chapter 23. Different Levels of Ecological Organization. Populations
Lect 19 - - Chapter 23 Different Levels of Ecological Organization Individuals Assemblage Community Ecosystem - all individuals of a particular species in a given area - but need to recognize genetic structure
More informationFor next Thurs: Jackson et al Historical overfishing and the recent collapse of coastal ecosystems. Science 293:
For next Thurs: Jackson et al. 2001. Historical overfishing and the recent collapse of coastal ecosystems. Science 293: 629-637. Resource: means of supplying a want or deficiency, from French resourdre
More informationFactors influencing production
Fisheries Reading: Miller Ch. 15 Supplementary: Levinton, Ch. 18 Krkošek et al. Epizootics of wild fish induced by farm fish. Proceedings of the National Academy of Sciences (2006) vol. 103 (42) pp. 15506
More informationStillwater Status Report: Lough Muck, County Tyrone
LOUGHS AGENCY OF THE FOYLE CARLINGFORD AND IRISH LIGHTS COMMISSION Stillwater Status Report: Lough Muck, County Tyrone Stillwater Fish Stock Survey Loughs Agency of the Foyle Carlingford and Irish Lights
More informationCambridge International Examinations Cambridge International Advanced Subsidiary and Advanced Level
Cambridge International Examinations Cambridge International Advanced Subsidiary and Advanced Level *4245615796* MARINE SCIENCE 9693/03 Paper 3 A2 Structured Questions May/June 2015 1 hour 30 minutes Candidates
More informationAnguillicolosis in the short-finned eel Anguilla australis: epidemiology and pathogenicity
New Lefebvre Zealand et al. Anguillicolosis Journal of Marine and in the Freshwater short-finned Research, eel 2004, Vol. 38: 577 583 0028 8330/04/3804 0577 The Royal Society of New Zealand 2004 577 Anguillicolosis
More informationEcological interactions between parasites and wildlife
Ecological interactions between parasites and wildlife Case study: salmon farms, wild salmon, and sea lice Sean Godwin November 21, 2018 Guest lecture #3 Introduction to Ecology Outline 1. Pathogens and
More informationInland Fisheries Ireland. National Research Survey Programme. Fish Stock Survey of Lough Nasnahida, July 2015
1 Inland Fisheries Ireland National Research Survey Programme Fish Stock Survey of Lough Nasnahida, July 2015 Fiona L. Kelly, Lynda Connor, Karen Delanty, John Coyne, Emma Morrissey, William Corcoran,
More information2005 REVIEW OF THE ATLANTIC STATES MARINE FISHERIES COMMISSION FISHERY MANAGEMENT PLAN FOR AMERICAN EEL (Anguilla rostrata) Prepared by:
2005 REVIEW OF THE ATLANTIC STATES MARINE FISHERIES COMMISSION FISHERY MANAGEMENT PLAN FOR AMERICAN EEL (Anguilla rostrata) Prepared by: The American Eel Plan Review Team Lydia C. Munger, Chair (ASMFC)
More informationBlue crab ecology and exploitation in a changing climate.
STAC Workshop 28 March 2017 Blue crab ecology and exploitation in a changing climate. Thomas Miller Chesapeake Biological Laboratory University of Maryland Center for Environmental Science Solomons, MD
More informationATLANTIC STATES MARINE FISHERIES COMMISSION. Winter Flounder Abundance and Biomass Indices from State Fishery-Independent Surveys
ATLANTIC STATES MARINE FISHERIES COMMISSION Winter Flounder Abundance and Biomass Indices from State Fishery-Independent Surveys Technical Committee Report to the Winter Flounder Management Board February
More informationZooplankton Migration Patterns at Scotton Landing: Behavioral Adaptations written by Lauren Zodl, University of Delaware
Zooplankton Migration Patterns at Scotton Landing: Behavioral Adaptations written by Lauren Zodl, University of Delaware Summary: Zooplankton have evolved specific migration patterns that increase their
More informationCOMMISSION OF THE EUROPEAN COMMUNITIES. Proposal for a COUNCIL REGULATION. establishing measures for the recovery of the stock of European Eel.
COMMISSION OF THE EUROPEAN COMMUNITIES Brussels, 6.10.2005 COM(2005) 472 final 2005/0201 (CNS) Proposal for a COUNCIL REGULATION establishing measures for the recovery of the stock of European Eel. (presented
More informationManaging Development and Chesapeake Bay s Estuarine Fish
Managing Development and Chesapeake Bay s Estuarine Fish Habitat Image and or Graphic Fisheries James H. Uphoff Jr. and Margaret M. McGinty Maryland Fisheries Service Funded through USFWS Federal Aid Maryland
More informationCaligus elongatus as parasites
Contributions to Zoology, 69 (1/2) 65-70 (2000) SPB Academic Publishing bv, The Hague Caligus elongatus as parasites of farmed salmonids in Ireland David Jackson, Sandra Deady, Daniel Hassett & Yvonne
More informationWater Framework Directive Fish Stock Survey of Transitional Waters in the South Western River Basin District Lough Gill
Water Framework Directive Fish Stock Survey of Transitional Waters in the South Western River Basin District Lough Gill Fiona L. Kelly, Ronan Matson, John Coyne, Rory Feeney, Emma Morrissey, and Kieran
More informationThe Central and Regional Fisheries Boards
1 ACKNOWLEDGEMENTS The authors wish to gratefully acknowledge the help and co-operation of the CEO Mr. Pat Doherty, Assistant CEO Mr. William Walsh and their staff from the Eastern Regional Fisheries Board.
More informationGroup Design Project. A Brazilian Adventure. Helen Currie, Gerardo Espindola Garcia, Nicholas Flores Martin, Michael Parkes & Hannah Young 10 May 2016
Group Design Project A Brazilian Adventure Helen Currie, Gerardo Espindola Garcia, Nicholas Flores Martin, Michael Parkes & Hannah Young 10 May 2016 21 st January 2016 BELO HORIZONTE Minas Gerais OURO
More informationA REVIEW AND EVALUATION OF NATURAL MORTALITY FOR THE ASSESSMENT AND MANAGEMENT OF YELLOWFIN TUNA IN THE EASTERN PACIFIC OCEAN
A REVIEW AND EVALUATION OF NATURAL MORTALITY FOR THE ASSESSMENT AND MANAGEMENT OF YELLOWFIN TUNA IN THE EASTERN PACIFIC OCEAN Mark N. Maunder and Alex Aires-da-Silva Outline YFT history Methods to estimate
More informationMinnesota Department of Natural Resources Fisheries Division, Lake Superior Area
Minnesota F-9-R(P)- Study 4 Job 616 Minnesota Department of Natural Resources Fisheries Division, Lake Superior Area Coaster Brook Trout Status in Minnesota-Lake Superior Tributaries Following Regulation
More informationEU request to provide advice on fisheries-related anthropogenic impacts on eels in EU marine waters
ICES Special Request Advice Northeast Atlantic Published 8 May 2017 sr.2017.08 EU request to provide advice on fisheries-related anthropogenic impacts on eels in EU marine waters Advice summary ICES provides
More informationFinal Report to Cornell Water Resources Institute
Final Report to Cornell Water Resources Institute Relative Abundance of Blueback Herring (Alosa aestivalis) in Relation to Permanent and Removable Dams on the Mohawk River To: Water Resources Institute,
More informationWater Framework Directive Fish Stock Survey of Upper Lake, Killarney, September 2014
1 Water Framework Directive Fish Stock Survey of Upper Lake, Killarney, September 2014 Fiona L. Kelly, Lynda Connor, Emma Morrissey, John Coyne, Rory Feeney, Ronan Matson and Kieran Rocks Inland Fisheries
More informationZebra mussels DISCUSSING ENVIRONMENTAL ISSUES
EPA ACTIVITY WORKSHEET TEACHER PAGE 1 6 Theme Class activity (CA). The students consider a second environmental problem of Irish interest the spread of the zebra mussel, a non-native species of shellfish,
More informationRapid recent expansion of the round goby (Neogobius melanostomus) and the western tubenose goby (Proterorhinus semilunaris) in Flanders (Belgium)
Rapid recent expansion of the round goby (Neogobius melanostomus) and the western tubenose goby (Proterorhinus semilunaris) in Flanders (Belgium) Hugo Verreycken, Jan Ostermeyer, Merlijn Mombaerts, Tine
More informationWater Framework Directive Fish Stock Survey of Doo Lough, October 2012
1 Water Framework Directive Fish Stock Survey of Doo Lough, October 2012 Fiona L. Kelly, Lynda Connor, Emma Morrissey, Ciara Wogerbauer, Ronan Matson, Rory Feeney and Kieran Rocks Inland Fisheries Ireland,
More informationCouncil CNL(17)33. Annual Progress Report on Actions Taken Under the Implementation Plan for the Calendar Year EU - Denmark
Agenda item 6.3 For information Council CNL(17)33 Annual Progress Report on Actions Taken Under the Implementation Plan for the Calendar Year 2016 EU - Denmark CNL(17)33 Annual Progress Report on Actions
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 informationCouncil CNL(14)21. Annual Progress Report on Actions Taken Under Implementation Plans for the Calendar Year EU Denmark
Agenda Item 6.1 For Information Council CNL(14)21 Annual Progress Report on Actions Taken Under Implementation Plans for the Calendar Year 2013 EU Denmark CNL(14)21 Annual Progress Report on Actions taken
More informationEastern and South Shore Nova Scotia Lobster LFAs The Fishery. DFO Atlantic Fisheries Stock Status Report 96/117E.
Maritimes Region DFO Atlantic Fisheries Stock Status Report 96/117E Eastern and South Shore Nova Scotia Lobster LFAs 31-33 Background Lobsters first entering the fishery in LFAs 31, 32, and 33 are probably
More informationSurvival Testing at Rocky Reach and Rock Island Dams
FISH PASSAGE CENTER 1827 NE 44 th Ave., Suite 240, Portland, OR 97213 Phone: (503) 230-4099 Fax: (503) 230-7559 http://www.fpc.org/ e-mail us at fpcstaff@fpc.org MEMORANDUM TO: FROM: Michele DeHart Erin
More informationFish Conservation and Management
Fish Conservation and Management CONS 486 Applied life history: individual growth, population growth, competition, predation Ross Chapter 3 Applied life history Age and size at maturity Growth Competition
More informationManuel McIlroy Florida Atlantic University
Statistical Analysis of Historic Recreational Fishing Catch Rates in Lake Worth Lagoon Using the Historic Fishing Records of the West Palm Beach Fishing Club Manuel McIlroy Florida Atlantic University
More informationProtect Our Reefs Grant Interim Report (October 1, 2008 March 31, 2009) Principal investigators: Donald C. Behringer and Mark J.
Investigating the role of the spotted spiny lobster (Panulirus guttatus) in the recovery of the long spined sea urchin (Diadema antillarum) on the coral reefs of the Florida Keys Protect Our Reefs Grant
More informationHADDOCK ON THE SOUTHERN SCOTIAN SHELF AND IN THE BAY OF FUNDY (DIV. 4X/5Y)
Canadian Science Advisory Secretariat Science Advisory Report 26/47 HADDOCK ON THE SOUTHERN SCOTIAN SHELF AND IN THE BAY OF FUNDY (DIV. 4X/5Y) Context Haddock (Melanogrammus aeglefinus) are found on both
More informationArizona Game and Fish Department Region I Fisheries Program. Chevelon Canyon Lake Fish Survey Report Trip Report April 2015
Arizona Game and Fish Department Region I Fisheries Program Chevelon Canyon Lake Fish Survey Report Trip Report April 2015 Authors: Sally Petre and Mike Lopez Report Date: June 25, 2015 The Arizona Game
More informationHow does climate change make fish late for dinner?
October 2017 How does climate change make fish late for dinner? Authors: Xavier Chevillot, Hilaire Drouineau, Patrick Lambert, Laure Carassou, Benoit Sautour and Jeremy Lobry Associate editors: Gogi Kalka,
More informationIOTC 2015 SC18 ES06[E]
DRAFT EXECUTIVE SUMMARY: BULLET TUNA Status of the Indian Ocean bullet tuna (BLT: Auxis rochei) resource TABLE 1. Bullet tuna: Status of bullet tuna (Auxis rochei) in the Indian Ocean. Area 1 Indicators
More informationAnchovy. Crash in landings
Background: 16000 14000 Landings 12000 10000 8000 Sardine 6000 4000 Anchovy 2000 0 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 Crash
More informationATLANTIC STURGEON. Consultations on listing under the Species at Risk Act
ATLANTIC STURGEON Consultations on listing under the Species at Risk Act Information summary and questionnaire for consultations on adding two Atlantic Sturgeon populations to the List of Wildlife Species
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 informationPopulation Structure
Population Structure Elements of Population Evolution Reproductive isolation (homing to natal sites) Differential natural and sexual selection Heritable traits Results Genetically determined population
More informationPROJECT REPORT: The Effects of Fin Damage on the Condition of Juvenile Lumpfish (Cyclopterus lumpus) in Hatcheries and Sea Cages.
PROJECT REPORT: The Effects of Fin Damage on the Condition of Juvenile Lumpfish (Cyclopterus lumpus) in Hatcheries and Sea Cages. Connie Pattillo Institute of Aquaculture, University of Stirling, Stirling,
More informationWater Framework Directive Fish Stock Survey of Kylemore Lough, August 2013
1 Water Framework Directive Fish Stock Survey of Kylemore Lough, August 2013 Fiona L. Kelly, Lynda Connor, Emma Morrissey, John Coyne, Ronan Matson, Rory Feeney and Kieran Rocks Inland Fisheries Ireland,
More informationCouncil CNL(14)29. Annual Progress Report on Actions Taken Under Implementation Plans for the Calendar Year Russian Federation
Agenda Item 6.1 For Information Council CNL(14)29 Annual Progress Report on Actions Taken Under Implementation Plans for the Calendar Year 2013 Russian Federation CNL(14)29 Annual Progress Report on Actions
More informationWe would also like to thank Dr. Martin O Grady (CFB) and No. 3 Operational Wing, Irish Air Corps (Aer Chór na héireann) for the aerial photographs.
ACKNOWLEDGEMENTS The authors wish to gratefully acknowledge the help and co-operation of the CEO Mr. Vincent Roche, the assistant CEO Dr. John Conneely and the staff of the North Western Regional Fisheries
More informationEffect of climate change on estuarine fish production in Queensland, Australia
Australian Rivers Institute Griffith University Effect of climate change on estuarine fish production in Queensl, Australia J.-O. Meynecke Study location Study objectives Is there a relationship between
More informationWater Framework Directive Fish Stock Survey of Lough Rea, July 2013
1 Water Framework Directive Fish Stock Survey of Lough Rea, July 2013 Fiona L. Kelly, Lynda Connor, Emma Morrissey, John Coyne, Ronan Matson, Rory Feeney and Kieran Rocks Inland Fisheries Ireland, 3044
More informationAn Overview of Lobster and Crab Enhancement Throughout the World
An Overview of Lobster and Crab Enhancement Throughout the World Ginny L. Eckert University of Alaska Biology Program (UAS) School of Fisheries and Ocean Sciences (UAF) ginny.eckert@uas.alaska.edu Zoeae
More informationD a c e ( L e u c i s c u s l e u c i s c u s L. ) : a n I n v a s i v e F i s h S p e c i e s i n I r e l a n d
D a c e ( L e u c i s c u s l e u c i s c u s L. ) : a n I n v a s i v e F i s h S p e c i e s i n I r e l a n d J. M. C a f f r e y, B. H a y d e n a n d T. W a l s h Irish Freshwater Fisheries Ecology
More informationBiology and Ecological Impacts of the European Green Crab, Carcinus maenas, on the Pacific Coast of Canada
Biology and Ecological Impacts of the European Green Crab, Carcinus maenas, on the Pacific Coast of Canada G.E. Gillespie and T.W. Therriault Fisheries and Oceans Canada Pacific Biological Station Green
More informationSalmon Five Point Approach restoring salmon in England
Salmon Five Point Approach restoring salmon in England Our Mission To restore the abundance, diversity and resilience of salmon stocks throughout England We will do this by:- a) Maximising the production
More informationHatcheries: Role in Restoration and Enhancement of Salmon Populations
Hatcheries: Role in Restoration and Enhancement of Salmon Populations Hatcheries play a large role in the management, ecology, and evolution of Pacific salmon. Why were/are they built? What are the assumptions
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 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 informationIYS(18)06_EU UK (Northern Ireland) Report on Planned Actions to Implement the International Year of the Salmon (IYS) Initiative
IYS(18)06_EU UK (Northern Ireland) Report on Planned Actions to Implement the International Year of the Salmon (IYS) Initiative The primary purpose of this IYS reporting template is for Parties / jurisdictions
More information(breed) Anadromous. wholly seawater
Maintenance of Constancy of the Internal Environment during Fish Migration Between Fresh and Seawater Group 4: Kuan Yi Xian, Jeeann Lee Tien Ming Lee Tze Chuen Lee Wan-Jean Lee Yee Tjin Migration Seasonal
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 informationWild Salmon Stock Assessment and Scientific Advice for Management in Ireland
Wild Salmon Stock Assessment and Scientific Advice for Management in Ireland The Only way is Irish An Irish Solution for an Irish problem??? Administration and management of salmon fisheries in Ireland
More informationSTUDY PERFORMANCE REPORT
STUDY PERFORMANCE REPORT State: Michigan Project No.: F-53-R-14 Study No.: 486 Title: Assessment of lake trout populations in Michigan s waters of Lake Michigan. Period Covered: April 1, 1997 to March
More informationZooplankton Availability to. Larval Walleye (Sander vitreus) in Black Lake, MI, USA
Zooplankton Availability to Larval Walleye (Sander vitreus) in Black Lake, MI, USA Dana Jo DePlonty School of Biological Science Dr. Kristi Arend 1 Abstract Black Lake has very few small walleye even though
More informationCo-Principal Investigators Stephen C. Jewett, Ph.D. Paul C. Rusanowski, Ph.D.
PROGRESS REPORT FACTORS AFFECTING NEARSHORE SURVIVAL AND PRODUCTION OF JUVENILE SOCKEYE SALMON FROM KVICHAK BAY Phase I: Important habitat, migration routes and food resources CoPrincipal Investigators
More informationA field energy budget for northern pike, an aquatic piscivore. James S. Diana School of Natural Resources and Environment University of Michigan
A field energy budget for northern pike, an aquatic piscivore James S. Diana School of Natural Resources and Environment University of Michigan Philosophical debate A man has only enough time to do what
More informationPrevious Work on the Culture of the Cocahoe Minnow Fundulus grandis
Previous Work on the Culture of the Cocahoe Minnow Fundulus grandis John P. Hawke, Julie A. Anderson, and Chris C. Green LSU AgCenter LSU School of Veterinary Medicine 1930s: freshwater baitfish production
More informationJuvenile Salmon Use of Knik Arm Estuaries. Hannah N. Ramage
Juvenile Salmon Use of Knik Arm Estuaries Hannah N. Ramage Literature Review Function of estuaries for juvenile salmon Migration pathway Pink salmon use estuaries as a neutral pathway (Simenstad 1982)
More informationLake Monitoring Program: Lesser Slave Lake Stock Assessment
Lake Monitoring Program: Lesser Slave Lake Stock Assessment Greg Fortier, John Tchir 1 1 Alberta Conservation Association, Bag 9000-26, Peace River, Alberta, Canada T8S 1T4 Disclaimer: This document is
More informationEssential Fish Habitat Description Atlantic cod (Gadus morhua)
Description Atlantic cod (Gadus morhua) In its Report to Congress: Status of the Fisheries of the United States (September 1997), NMFS determined the Gulf of Maine stock of cod is considered overfished,
More informationFecundity & Spawning. LO: extrapolate effects of physical conditions on fecundity and spawning of fish
Fecundity & Spawning LO: extrapolate effects of physical conditions on fecundity and spawning of fish Reproductive Strategies - combination of evolution, physiology, and behavior - live bearing (viviparous)
More informationFall 2017: Problem Set 3 (DUE Oct 26; 50 points)
ESS 445 Introduction to Fisheries Science and Management: Biology, Ecology, Management, and Conservation of North American Freshwater Fishes and Aquatic Ecosystems Fall 2017: Problem Set 3 (DUE Oct 26;
More informationKenai River Sockeye Escapement Goals. United Cook Inlet Drift Association
Kenai River Sockeye Escapement Goals United Cook Inlet Drift Association 2014 Evaluating Sockeye Escapement Goals in the Kenai River Utilizing Brood Tables and Markov Tables This presentation pertains
More informationManaging Chesapeake Bay s Land Use, Fish Habitat, and Fisheries: Studies. Jim Uphoff & Margaret McGinty, Fisheries Service
Managing Chesapeake Bay s Land Use, Fish Habitat, and Fisheries: Positive Image and or Negative Graphic Case Studies Jim Uphoff & Margaret McGinty, Fisheries Service Maryland Fisheries Service has been
More informationOcean and Plume Science Management Uncertainties, Questions and Potential Actions (Work Group draft 11/27/13)
Ocean and Plume Science Management Uncertainties, Questions and Potential Actions (Work Group draft 11/27/13) (The work group thinks the following four questions should form a logic path, but that logic
More informationAMBLYGASTER SIRM (WALBAUM) OFF THE NEGOMBO COAST
-Y J Natn. Sci. Coun. Sri Lanka 1995 23(1): 1-7 /-!~h,,!,/lic,' ) - 1 J : STUDIES ON THE EXPLOITATION OF TRENCHED SARDINE AMBLYGASTER SIRM (WALBAUM) OFF THE NEGOMBO COAST W.P.N KARUNASINGHE1 and M. J.S.
More informationObserved pattern of diel vertical migration of Pacific mackerel larvae and its implication for spatial distribution off the Korean Peninsula
SPF-S2_Lee Observed pattern of diel vertical migration of Pacific mackerel larvae and its implication for spatial distribution off the Korean Peninsula Hwahyun Lee 1, Sukyung Kang 2, Kyungmi Jung 2, Jung-Jin
More information