United States Alaska, GOA Marine mammals Observer 2005 High Annual average of 2.52 marine (National Pollock pelagic mammals Marine trawl Fisheries Service, 2011). See pages United States Foreign vessels Marine mammals Observer High Influential biological 538 marine mammals (Waring et al., fishing off the coverage on factors: target 1990) Eight cetacean mean±SD marine mammal catch northwest U.S. foreign species of the species and three rate for all fisheries combined = coast vessels was fishery, prevalence unidentified baleen 0.059±0.019 (1 per 17.0 tows) or 25-35% during of marine mammals whales were 0.0124±0.0121 (1 per 80.6 h of 1977-82. and in the fishing area caught towing). increased to and time of day. Common dolphins The mean±SD dolphin catch rate 58%, 86%, Influential comprised 93% of for all fisheries combined was 95%. 98%, operational catch 0.048±0.013 per tow (one dolphin 100%, and considerations per 20.7 tows), or 0.0185±0.0019 100%, include: tow per hour of towing (one dolphin respectively, duration, level of per 98 h of towing) in 1983-88 tow in water 95% confidence intervals, column, size of net calculated on untransformed data, opening, haul-back for all fisheries combined were speed and gear 0.4±1.6 dolphins per 100 h of design. towing 68% dolphins caught along shelf edge
United States Alaska, GOA Pollock pelagic trawl Marine mammals Observer 2005 High Annual average of 2.52 marine mammals (National Marine Fisheries Service, 2011). See pages United States Foreign vessels fishing off the northwest U.S. coast Marine mammals Eight cetacean species and three unidentified baleen whales were caught Common dolphins comprised 93% of catch Observer coverage on foreign vessels was 25-35% during 1977-82. and increased to 58%, 86%, 95%. 98%, 100%, and 100%, respectively, in 1983-88 High Influential biological factors: target species of the fishery, prevalence of marine mammals in the fishing area and time of day. Influential operational considerations include: tow duration, level of tow in water column, size of net opening, haul-back speed and gear design. 68% dolphins caught along shelf edge 538 marine mammals mean±SD marine mammal catch rate for all fisheries combined = 0.059±0.019 (1 per 17.0 tows) or 0.0124±0.0121 (1 per 80.6 h of towing). The mean±SD dolphin catch rate for all fisheries combined was 0.048±0.013 per tow (one dolphin per 20.7 tows), or 0.0185±0.0019 per hour of towing (one dolphin per 98 h of towing) 95% confidence intervals, calculated on untransformed data, for all fisheries combined were 0.4±1.6 dolphins per 100 h of towing (Waring et al., 1990)
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