Shark Depredation and Unwanted Bycatch in Pelagic Longline

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Shark Depredation and Unwanted Bycatch in Pelagic Longline Fisheries Table A4.11. CPUE (N/1000 hooks, kg/1000 hooks) of sharks caught by swordfish, albacore and Northern bluefin tuna longline vessels in the Central Mediterranean Sea in 1998-1999 (Guglielmi et al., 2000). Table A4.12. Average weight and CPUE (N/1000 hooks, kg/1000 hooks) of shark catches by drifting longline vessels in 1998-1999 (Di Natale & Pelusi (2000) in Commission of the European Communities, 2003). Shark Species CPUE (N/1000 hooks) CPUE (kg/1000 hooks) Shark Species CPUE (N/1000 hooks) CPUE (kg/1000 hooks) Prionace glauca 0.223 13.949 Alopias vulpinus 0.011 0.891 Carcharhinus plumbeus 0.022 0.368 Galeorhinus galeo 0.006 0.061 Isurus oxyrhinchus 0.011 0.863 Lamna nasus 0.011 0.824 Sphyrna zygaena 0.006 0.334 Prionace glauca 0.28 17.4 Alopias vulpinus 0.01 0.3 Carcharhinus plumbeus 0.03 0.5 Galeorhinus galeo 0.01 0.1 Isurus oxyrhinchus 0.01 1.1 Lamna nasus 0.01 1.0 Sphyrna zygaena 0.01 0.4 Table A4.13. Average weight and CPUE (N/1000 hooks, kg/1000 hooks) of blue shark landed at Monopoli from drifting longlines during 1984-1987 and 1991-1998 (Marano et al., 1988; De Zio et al., 2000). 1984 1985 1986 1987 1991 1992 1993 1994 1995 1996 1997 1998 Average weight 16.29 17.03 15.98 11.63 14.18 8.36 10.12 9.77 11.81 11.71 10.69 10.81 CPUE (N/1000 hooks) 0.71 0.76 1.72 0.97 0.89 2.39 1.52 0.55 1.12 0.69 1.14 1.87 CPUE (kg/1000 hooks) 11.55 12.90 27.42 11.33 12.64 19.95 15.35 5.41 13.24 8.12 12.16 20.21 Table A4.14. Blue shark and thresher shark catches and CPUE recorded at Savelletri (South Adriatic Sea) from drifting longlines fisheries in 1998 (De Metrio et al., 2000). Table A4.15. CPUE (kg/1000 hooks) of blue shark landed at Porto Cesareo from drifting longline vessels, 1978 to 1981 ( De Metrio et al, 1984). Prionace glauca Alopias vulpinus 1978 1979 1980 1981 Average weight 18.7 115.2 CPUE (N/1000 hooks) 1.5 0.1 CPUE (kg/1000 hooks) 27.3 1.3 Swordfish drifting longline: P. glauca CPUE (kg) Albacore drifting longline: P. glauca CPUE (kg) 0.138 0.524 0.285 0.463 0.020 0.019 0.017 0.004 Table A4.16a. Average weight and CPUE (N/1000 hooks, kg/1000 hooks) of blue shark observed on board of Porto Cesareo drifting longline vessels in 1998 (De Metrio et al., 2000). Table A4.16b. Average weight and CPUE (N/1000 hooks, kg/1000 hooks) of blue shark landed at Porto Cesareo from drifting long lines in 1998 (De Metrio et al., 2000). Prionace glauca Prionace glauca Swordfish drifting longline Albacore drifting longline Swordfish drifting longline Albacore drifting longline Average weight 24.1 22.9 CPUE (N) 0.9 0.3 CPUE (kg) 21.8 6.1 Average weight 25.4 22.9 CPUE (N) 0.4 0.06 CPUE (kg) 9.7 1.4 80
Italy Mediterranean Industrial Pelagic Longline Swordfish Fishery Table A4.17. CPUE (N/1000 hooks) of sharks observed on board of Porto Cesareo drifting longline vessels targeting swordfish from 1978 to 1985 (Filanti et al., 1986). 1978 1979 1980 1981 1982 1983 1984 1985 Prionace glauca 1.53 1.13 0.94 2.25 1.40 3.07 1.12 1.17 Lamna nasus 0.220 0.184 0.218 0.016 0.013 - - - Sphyrna zygaena 0.043 0.044 0.007 - - - 0.03 0.003 Alopias vulpinus 0.096 0.047 0.021 0.004 0.007 - - - Hexanchus griseus - 0.004 - - - - - 0.003 Table A4.18. Average weight and CPUE (N/1000 hooks, kg/1000 hooks) of blue shark caught by the Sanremo fleet in the Cetacean Sanctuary of the Ligurian Sea from 1990 to 1998 (Garibaldi and Orsi Relini, 2000). 1990 1991 1992 1993 1994 1995 1996 1997 1998 Average Av. weight 12.08 16.6 12.5 13.3 9.28 8.5 9.6 10.4 9.96 11.0 CPUE (N) 0.28 0.52 1.09 0.08 0.18 0.65 0.4 0.2 0.12 0.32 CPUE (kg) 3.38 8.75 13.73 1.12 1.68 5.58 3.74 2.16 1.17 3.58 Table A4.19. CPUE (kg/1000 hooks) of shark by-catch of swordfish longline registered in Imperia and Sanremo landing points, from 1990 to 1997 (Orsi Relini et al., 1999). 1990 1991 1992 1993 1994 1995 1996 1997 Average CPUE (kg/1000 hooks) 1.9 8 7.5 1.4 2.55 5.75 5.25 2.2 4.3 Table A4.20. Number and tons of sharks landed from longline vessels at ports on the Tyrrhenian Sea and the Strait of Sicily, 1994-1995 (Di Natale, 1998). 1994 1995 Shark Species Number tons (GWT) Number tons (GWT) Alopias vulpinus 9 1 34 4 Prionace glauca 2160 80 3190 157 Lamna nasus 127 5 212 9 81
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Shark Depredation and Unwanted Byca
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Contents Summary and Conclusions 1
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Contents Appendix 3. Fiji Pelagic L
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Contents Appendix 8. USA Hawaii Lon
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Chapter 1 Introduction and Methods
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Introduction and Methods 1.2. Metho
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Fishing Gear and Operational Charac
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Fishing Gear and Operational Charac
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Shark Catch Rates and Disposition T
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Chapter 4 National and Internationa
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National and International Measures
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Economic, Practical, Ecological and
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Economic, Practical, Ecological and
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Chapter 6 Industry Attitudes and Pr
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Industry Attitudes and Practices Lo
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Industry Attitudes and Practices Fi
Page 43 and 44: Chapter 7 Potential of Deterrents,
Page 45 and 46: Potential of Deterrents, Hotspot Av
Page 47 and 48: References Campana, S.E., L. Marks,
Page 49: References Neves dos Santos, M., Ga
Page 52 and 53: Shark Depredation and Unwanted Byca
Page 99 and 100: Appendix 5 Japan Pelagic Longline F
Page 101 and 102: Japan Pelagic Longline Fisheries Fi
Page 103 and 104: Japan Pelagic Longline Fisheries mo
Page 105 and 106: Japan Pelagic Longline Fisheries Ta
Page 107 and 108: Japan Pelagic Longline Fisheries is
Page 109 and 110: Japan Pelagic Longline Fisheries ta
Page 111 and 112: Japan Pelagic Longline Fisheries In
Page 113 and 114: Japan Pelagic Longline Fisheries A5
Page 115 and 116: Appendix 6 Peru Artisanal Mahimahi
Page 117 and 118: Peru Artisanal Mahimahi And Shark L
Page 127 and 128: Appendix 7 South Africa Pelagic Lon
Page 129 and 130: South Africa Pelagic Longline Tuna
Page 135 and 136: Appendix 8 USA Hawaii-based Pelagic
Page 137 and 138: USA Hawaii-based Pelagic Longline S
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USA Hawaii-based Pelagic Longline S
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Appendix 9 USA Atlantic, Gulf of Me
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USA Atlantic, Gulf of Mexico and Ca
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Shark Depredation and Unwanted Bycatch in Pelagic Longline

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