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Investigation of weight loss in Pacific cod (Gadus macrocephalus) due to exsanguination
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2011
[PDF-556.42 KB]
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Description:Pacific cod (Gadus macrocephalus) are an important groundfish species harvested by longline vessels in the Bering Sea and Aleutian Islands. Exsanguination, or bleeding, is an important processing step at the time of capture to obtain high product quality, including freshness and the visual appearance of fillets. The National Marine Fisheries Service, Alaska Region, is responsible for assessing fishery catch, which is generally a round weight estimate collected prior to any processing, including exsanguination. However, longline vessels present a special situation because exsanguination is required prior to weighing, which may create a bias in round weight estimates due to lost blood weight. 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. [doi:10.7289/V5/F/AKR-10 (http://doi.org/10.7289/V5/F/AKR-10)]
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Content Notes:by J. Gasper, J. Watson, and J. Mondragon.
"November 2011."
Also available online in PDF format via the NOAA Central Library.
Includes bibliographical references (pages 15-16).
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Rights Information:Public Domain
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