ESTIMATION OF CATCHES FOR BLUE SHARK AND SHORTFIN MAKO BY THE JAPANESE TUNA LONGLINE FISHERY IN THE ATLANTIC OCEAN,
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1 SCRS/27/91 Collect. Vol. Sci. Pap. ICCAT, 62(5): (28) ESTIMATION OF CATCHES FOR BLUE SHARK AND SHORTFIN MAKO BY THE JAPANESE TUNA LONGLINE FISHERY IN THE ATLANTIC OCEAN, Hiroaki Matsunaga 1 SUMMARY Catches for blue shark and shortfin mako caught by the Japanese tuna longline fishery in the Atlantic Ocean were estimated using species-specific logbook data from 1994 to 25 filtered with a 7% reporting rate. ly catches of blue shark in the entire region were estimated to be 15,-335, (mean 199,) in number and 2,8-9,9 metric tons (mean 5,6) in weight. Catches of shortfin mako were estimated to be 3,-38,8 (mean 14,7) and 12-1,79 tons (mean 64). Decreasing trends were observed in both catch number and in weight of the two species. However, the catches of shortfin mako in 1994 and 1995 are supposed to be over-estimated because some catches of blue shark in 1994 and 1995 are considered to be recorded as those of shortfin mako by mistake. Therefore, it is not appropriate to use these catch estimations at present. RÉSUMÉ Les captures de requins peaux bleues et de requins taupes bleues réalisées dans l océan Atlantique par la pêcherie palangrière thonière du Japon ont été estimées à l aide des données des carnets de pêche spécifiques aux espèces correspondant à la période courant de 1994 à 25, lesquelles ont été filtrées avec un taux de déclaration de 7%. Les prises annuelles de requin peau bleue dans l ensemble de la région ont été estimées à (moyenne : 199.) en nombre et à tonnes métriques (moyenne : 5.6) en poids. Les prises de requin taupe bleue ont été estimées à (moyenne : 14.7) et à 12-1,79 tonnes métriques (moyenne : 64). Des tendances décroissantes ont été observées à la fois dans la prise numérique et le poids des deux espèces. Toutefois, les prises de requin taupe bleue en 1994 et 1995 sont censées être surestimées étant donné que certaines captures de requin peau bleue réalisées en 1994 et 1995 auraient été consignées par erreur comme des captures de requin taupe bleue. Il n est donc pas approprié d utiliser ces estimations de capture à l heure actuelle. RESUMEN Se estimaron las capturas de tintorera y marrajo dientuso de la pesquería atunera de palangre japonés en el Atlántico utilizando los datos de cuadernos de pesca específicos de cada especie desde 1994 hasta 25, filtrados con una tasa de comunicación del 7%. Las capturas anuales de tintorera en toda la región se estimaron en (media 199.) en número y en t (media de 5.6) en peso. Las capturas de marrajo dientuso se estimaron en (media de 14.7) y t (media de 64). Se observaron tendencias decrecientes tanto en el número como en el peso de la captura de ambas especies. Sin embargo, se supone que las capturas de marrajo dientuso en 1994 y 1995 están sobreestimadas porque se considera que algunas capturas de tintorera en 1994 y 1995 están registradas por error como de marrajo dientuso. Por lo tanto, no es adecuado utilizar actualmente estas estimaciones de captura. 1. Introduction KEYWORDS Blue shark, shortfin mako,longline, catches In previous report (Matsunaga & Nakano 24), we estimated the shark catches by species from the reliable data obtained by applying the method of Nakano and Honma (1996), which filters the logbook data by shark reporting rate (the ratio of operations in which sharks were reported to the total operations in a cruise) in order to avoid under reporting by the fishermen. Using this method, Nakano (1998, 1999, 21) calculated the standardized CPUE of total pelagic sharks caught by Japanese longline fishery in the Atlantic Ocean as 1 National Research Institute of Far Seas Fisheries, FRA 5-7-1Orido Shimizu-ku, Shizuoka, , Japan. 1573
2 abundance index of blue shark. The studies verifying this filtering method were conducted by Shiode and Nakano (22) and Nakano and Clarke (26). In this report, update of catch estimation for blue shark and shortfin mako was conducted more carefully than previous. 2. Material and methods Filtering method developed in Nakano and Honma (1996) was adopted and data whose shark reporting rate was greater than 7% was used for the analysis. The time series of the data was 12 years from 1994 to 25. Based on the distribution of sharks, research area was divided into 7 areas (Figure 1), and the hypothesis that there were two stocks in the Atlantic, one in the North (Areas 1-4) and another in the South (Areas 5-7), was adopted. CPUE (the number of sharks caught per 1 hooks) was calculated for each year, area and quarter. Catch estimates in number were obtained from the CPUE and the total effort in each stratum. Confidence intervals were generated by two stage bootstrapping. Bootstrapping was conducted for 2 iterations. The average weights of products by area and quarter were gleaned from the filtered logbook data. The conversion ratios from products to the whole body are 1.5 for blue shark and 1.56 for shortfin mako (JANUS 22). The average weights of whole body are shown in Table 1. Catch estimates in weight are obtained by multiplying those in number by the average weight of the whole body in each stock. 3. Results and discussion During the 12 years from 1994 to 25, estimated yearly catches of blue shark in number by Japanese tuna longline vessels ranged from 79, to224, (mean 129,) in the North, 25, to 183, (71,) in the South and 14, to 334, (199,) in the entire Atlantic (Figure 2). After conversion to weight, these figures became 1,7-3,9 metric tons (mean 2,6 tons), 1,2-7,3 tons (3,) and 4,2-99, tons (5,6) respectively (Figure 3, Table 2). There are gently decreasing trends both in number and weight but gradual recoveries are observed after 22. These results are supposed to be mainly due to the yearly variations of fishing efforts. Catches of shortfin mako in number were estimated to range from 2,6 to 17,4 (mean 8,4) in the North, 4 to 24,3 (6,2) in the South and 3, to 38,9 (14,7) overall (Figure 4). After weight conversion, these figures became 9-62 tons (34), 3-1,25 tons (3) and 12-1,8 tons (64) respectively (Figure 5, Table 2). There were some fluctuations and no apparent trend in the North. In the South, a decreasing trend was observed. These results are supposed to be caused by the yearly variations of fishing efforts and CPUE level. However the catches in 1994 and 1995 are supposed to be overestimated because some catches of blue shark in 1994 and 1995 are considered to be recorded as those of shortfin mako by mistake (Matsunaga 27). Therefore, it is not appropriate to use these catch estimations at present. Sum of effort for filtered data was about 13 % of the whole effort. The ratios of the estimated catches in number from the filtered data to those from all data without filtering were as follows, blue shark: 4.7, shortfin mako: 2.8. In the previous report (Matsunaga & Nakano 24), we pointed out the importance of partitioning the fishing area into sub-areas with reference to characteristics relating to shark catches, in order to avoid over simplification using ocean-wide assumptions. But we did not conduct the enough partitioning in weight at that time. This time, the partitioning in both fishing area and quarter was done, so that more precise estimation must be made than that in the previous time. Estimated catch of blue shark and shortfin mako in weight in this report is 77% and 75% comparing to those in the previous report. References JAUNS. 22. Conversion of the shark catches by species and gear to the whole body. Report of the research on the resource of high-migratory fishes around Japan, MATSUNAGA H. and H. Nakano. 24. Estimation of shark catches by Japanese tuna longline vessels in the Atlantic Ocean. Collect. Vol. Sci. Pap. ICCAT, 58(3): MATSUNAGA, H. 28 Standardized CPUE for shortfin mako caught by the Japanese tuna lonline fishery in the Atlantic Ocean, Collect. Vol. Sci. Pap. ICCAT, 62, in press (SCRS/27/92). 1574
3 NAKANO, H Standardized CPUE for pelagic shark caught by the Japanese longline fishery in the Atlantic Ocean. Collect. Vol. Sci. Pap. ICCAT, 48(3): NAKANO, H. 1999: Updated standardized CPUE for pelagic shark caught by the Japanese longline fishery in the Atlantic Ocean. Collect. Vol. Sci. Pap. ICCAT, 51(6): NAKANO, H. 21. Standardized CPUE for blue shark caught by Japanese longline fishery in the Atlantic Ocean. Collect. Vol. Sci. Pap. ICCAT, 54(4): NAKANO, H. and M. Honma Historical CPUE of pelagic sharks caught by the Japanese longline fishery in the Atlantic Ocean. Collect. Vol. Sci. Pap. ICCAT, 46(4): NAKANO, H. and S. Clarke. 26. Filtering method for obtaining stock indices by shark species from species-combined logbook data in tuna longline fisheries. Fish. Sci. 72: SHIODE, D. and H. Nakano 22. Verification of shark catch data of the logboook records in Japanese longline fishery in comparison with the observer reports. Collect. Vol. Sci. Pap. ICCAT, 54(4):
4 Table1Averagebodyweight ofbluesharkandshortfinmakoineachstratum. BS:blueshark,SM:shortfinmako(kg). Quarter Area BS SM BS SM BS SM BS SM Table 2 Estimated yearly catch of blue shark and shortfin mako in weight (ton) by the Japanese longline fishery in the Atlantic. N: North, S: South, NS: entire blue shark shortfin mako N S NS N S NS [175] [1245] [142] [71] [176] [1786] Figure 1. Area classification used for the analysis. 1576
5 4 blue shark N catch-n blue shark S blue shark NS S Figure 2. Estimated number with 9% confidence intervals of blue shark caught by the Japanese tuna longline fishery in the Atlantic. N: North, S: South, NS: entire Atlantic. 1577
6 6 4 2 blue shark N blue shark S blue shark NS 1 5 S Figure 3. Estimated weight with 9% confidence intervals of blue shark caught by the Japanese tuna longline fishery in the Atlantic. 1578
7 Shortfin mako N Shortfin mako S Shortfin mako NS S Figure 4. Estimated number with 9% confidence intervals of shortfin mako caught by the Japanese tuna longline fishery in the Atlantic. 1579
8 15 1 Shortfin mako N Shortfin mako S Shortfin mako NS S Figure 5. Estimated weight with 9% confidence intervals of shortfin mako caught by the Japanese tuna longline fishery in the Atlantic. 158
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