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Investigation of Weight Loss in Pacific cod (Gadus macrocephalus) Due to Exsanguination, 2011

February 20, 2011

Pacific cod are an important groundfish species harvested by longline vessels in the Bering Sea and Aleutian Islands.

This study examines weight loss due to exsanguination by sampling Pacific cod at time intervals of 30 seconds, 1:00 minute, and 1:30 minutes after landing. Study results show that, on average, Pacific cod generally bleed the most during the first 30 seconds with smaller volumes in later time periods. Moreover, the rate of bleeding is dependent on whether the cod is alive at the time of bleeding, whether the cod was bleeding from a wound prior to exsanguination, and the size of the Pacific cod. On average, Pacific cod lost 0.66% of their body weight in 30 seconds and about 1% after 1:30 minutes.

Last updated by Alaska Regional Office on 04/23/2019

Alaska Groundfish Research