Shark Depredation and Unwanted Bycatch in Pelagic Longline
Shark Depredation and Unwanted Bycatch in Pelagic Longline
Shark Depredation and Unwanted Bycatch in Pelagic Longline
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South Africa <strong>Pelagic</strong> Longl<strong>in</strong>e Tuna <strong>and</strong> Swordfish Fishery<br />
Table A7.3. <strong>Shark</strong> catches, effort <strong>and</strong> catch rates 1998 - 2005<br />
1998 1999 2000 2001 2002 2003 2004 2005 Total<br />
Total hooks 472,104 516,919 1,476,807 1,637,358 2,658,127 2,440,069 5,098,196 7,538,265 21,837,845<br />
Observed hooks 73,859 27,385 73,859 281,206 301,831 188,542 139,430 3,230,257 4,316,369<br />
% observed of<br />
total<br />
16% 5% 5% 17% 11% 8% 3% 43% 20%<br />
Swordfish 493 608 493 2343 2944 1836 319 3064 12100<br />
Tuna 1746 380 1746 4067 3891 3179 2250 84928 102187<br />
Total Catch 3472 1606 3472 11102 12141 8473 5192 114478 159936<br />
Blue shark 611 443 611 1914 2080 1546 1722 9014 17941<br />
Short-f<strong>in</strong> Mako<br />
shark<br />
180 66 180 478 238 236 142 2944 4464<br />
Crocodile shark 18 9 18 57 619 59 190 117 1087<br />
Bronze Whaler<br />
shark<br />
3 20 3 377 139 61 35 27 665<br />
Thresher shark 8 1 8 19 90 20 15 422 583<br />
<strong>Shark</strong><br />
unidentified<br />
Oceanic white tip<br />
shark<br />
0 0 0 1 103 75 137 141 457<br />
125 0 125 4 19 27 12 9 321<br />
Dusky shark 3 0 3 0 42 26 31 28 133<br />
Thresher Big eye<br />
shark<br />
10 3 10 0 0 18 0 33 74<br />
Porbeagle 1 0 1 4 44 18 0 4 72<br />
Hammerhead<br />
sharks<br />
Cookie cutter<br />
shark<br />
0 0 0 3 44 0 0 0 47<br />
0 0 0 0 1 18 0 0 19<br />
Zambezi shark 0 0 0 1 1 0 4 1 7<br />
Bigeye Sixgill<br />
shark<br />
0 0 0 0 0 0 0 3 3<br />
Soupf<strong>in</strong> shark 0 0 0 0 3 0 0 0 3<br />
Lanternshark 0 0 0 0 0 0 0 2 2<br />
Hardnose<br />
houndshark<br />
Houndshark<br />
Unidentified<br />
0 0 0 0 0 0 0 1 1<br />
0 0 0 0 0 0 0 1 1<br />
Tiger shark 0 0 0 0 0 0 0 1 1<br />
Total <strong>Shark</strong>s 959 542 959 2858 3423 2116 2289 12785 25931<br />
Number sharks<br />
catch per 1000<br />
hooks<br />
13.0 19.8 13.0 10.2 11.3 11.2 16.4 4.0 6.0<br />
Table A7.4. <strong>Shark</strong> bycatch as a proportion of total catch.<br />
Year Hooks Swordfish Tuna Tuna &<br />
Swordfish<br />
Total <strong>Shark</strong>s<br />
% sharks of<br />
Tuna<br />
% of T & S<br />
1998 27385 608 380 988 959 252% 55%<br />
1999 184864 1225 4628 5853 542 31% 25%<br />
2000 73859 493 1746 2239 959 55% 43%<br />
2001 281206 2343 4067 6410 2858 70% 45%<br />
2002 301831 2944 3891 6835 3423 88% 50%<br />
2003 188542 1836 3179 5015 2116 67% 42%<br />
2004 139430 319 2250 2569 2289 102% 89%<br />
2005 4316369 3064 84928 114478 12785 15% 15%<br />
Total 5513486 12832 105069 144387 25931 25% 18%<br />
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