Bluntnose sixgill shark (Hexanchus griseus) COSEWIC assessment and status report: appendix 4

Appendix 4. Estimated actual catch of bluntnose sixgill shark in commercial fisheries

Estimated actual catch of bluntnose sixgill shark in commercial spiny dogfish and halibut fisheries based on ratios derived from observer data expanded to dockside monitoring program landings.
Year Observer data (kg)
Sixgill shark
Observer data (kg)
Spiny dogfish
DMP landings (t)
Pacific halibut
DMP landings (t)
Spiny dogfish
DMP landings (t)
Pacific halibut
2001
676
62087
566399
3198
4582
2002
3408
232047
1422023
3823
5298
2003
2267
421785
1521024
4711
5258
2004
1397
394590
650302
4585
5428
Total
7748
1110509
4159747
16317
20566
Ratio (kg sixgill/t retained directed catch)
 
7.0
1.9
 
 
Average landings/year
 
 
 
4079
5141
Possible actual catch of sixgill (kg)
 
 
 
28460
9576
Estimated Annual Total Catch (kg)
 
 
 
 
38037

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