Shark Depredation and Unwanted Bycatch in Pelagic Longline

More documents

Recommendations

Info

Shark Depredation and Unwanted Bycatch in Pelagic Longline Fisheries Table 6.1. Industry attitudes towards shark bycatch and depredation prevalent in each of 12 pelagic longline fisheries. Longline Industry Attitude Pelagic Longline Fishery Want to minimize shark interactions due to time required to repair gear and discard sharks Want to minimize shark interactions because revenue from catching sharks is exceeded by costs from shark interactions Australia Tuna and Billfish Fishery X X Chile Artisanal Mahi Mahi and Shark Fishery Chile Swordfish Fishery Little incentive to reduce shark interactions because they are infrequent and result in nominal costs Want to maximize shark catch because revenue exceeds economic costs from shark interactions X Fiji Tuna Fishery X X Italy Mediterranean Industrial Swordfish Fishery Japan Distant Water, Offshore and Nearshore Tuna Fisheries Peru Artisanal Mahi Mahi and Shark Fishery South Africa Tuna and Swordfish Fishery X X X X X U.S. Hawaii Tuna Fishery X X U.S. Hawaii Swordfish Fishery X X Table 6.2. Prevalent industry practices employed to address shark interactions in 12 pelagic longline fisheries. Pelagic Longline Fishery Practice Australia tuna and billfish fishery Chile artisanal mahi mahi and shark fishery Chile swordfish fishery Fiji tuna fishery Move position if shark interactions are high and target species CPUE is low X X X Avoid fishing grounds with high shark abundance from past experience or communication from other vessels Reduce shark detection of baited hooks Set gear deeper Use or avoid type of bait or hook X X X X To discard sharks, cut branch line or remove hook by making cut in shark mouth No wire trace to reduce retention of sharks Do not use lightsticks Avoid setting in specific sea surface temperature Set during daytime Minimize gear soak time Kill sharks before discarding to avoid re-catching X X X X X X X X Do nothing to reduce shark catch because shark catch is desirable or shark interactions are rare X 24
Industry Attitudes and Practices Longline Industry Attitude (continued) Want to minimize shark catch to avoid injuring crew when landing sharks from projectile swivels and shark bites Want to minimize shark fishing mortality because are concerned with overfishing Want to minimize shark catch to make more baited hooks available to more valuable fish species Shark interactions are an expected and unavoidable part of longline fishing No incentive to reduce shark interactions because revenue from sharks exceeds costs from shark interactions X X X X X X X X X X X X X X X X Pelagic Longline Fishery (continued) Italy Mediterranean industrial swordfish fishery Japan distant water, offshore and nearshore fisheries Peru artisanal mahi mahi and shark fishery South Africa tuna and swordfish fishery U.S. Hawaii tuna fishery U.S. Hawaii swordfish fishery X X X X X X X X X X X X 25
Page 3 and 4: Shark Depredation and Unwanted Byca
Page 5: Shark Depredation and Unwanted Byca
Page 9 and 10: Contents Summary and Conclusions 1
Page 11 and 12: Contents Appendix 3. Fiji Pelagic L
Page 13: Contents Appendix 8. USA Hawaii Lon
Page 19 and 20: Chapter 1 Introduction and Methods
Page 21 and 22: Introduction and Methods 1.2. Metho
Page 23 and 24: Fishing Gear and Operational Charac
Page 25 and 26: Fishing Gear and Operational Charac
Page 27 and 28: Shark Catch Rates and Disposition T
Page 29 and 30: Chapter 4 National and Internationa
Page 31 and 32: National and International Measures
Page 33 and 34: Economic, Practical, Ecological and
Page 35 and 36: Economic, Practical, Ecological and
Page 37: Chapter 6 Industry Attitudes and Pr
Page 41 and 42: 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 88 and 89:
Shark Depredation and Unwanted Byca
Page 90 and 91:
Page 92 and 93:
Page 94 and 95:
Page 96 and 97:
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 119 and 120:
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
Appendix 7 South Africa Pelagic Lon
Page 129 and 130:
South Africa Pelagic Longline Tuna
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Appendix 8 USA Hawaii-based Pelagic
Page 137 and 138:
USA Hawaii-based Pelagic Longline S
Page 139 and 140:
Page 141 and 142:
Page 143 and 144:
Page 145 and 146:
Page 147 and 148:
Appendix 9 USA Atlantic, Gulf of Me
Page 149 and 150:
USA Atlantic, Gulf of Mexico and Ca
Page 151 and 152:
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
Page 161 and 162:
show all

Shark Depredation and Unwanted Bycatch in Pelagic Longline

Create successful ePaper yourself

Delete template?

Save as template?