Tagging mortality experiments on Pacific mackerel, Pneumatophorus japonicus

Gregory, Paul A. (1977) Tagging mortality experiments on Pacific mackerel, Pneumatophorus japonicus. Long Beach, CA, California Department of Fish and Game, (Marine Resources Technical Report, 40)

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Abstract

Two experiments were conducted to compare tagging mortality rates when Pacific mackerel are tagged using a traditional method and a modified method. Tagged and control fish in equal numbers were held in tanks on board the R/V ALASKA and observed for mortality. The experiments revealed mortality rates of 24% when the tag passes between the pterygiophores or neural spines and 1.5% when the tag is placed in the lateral musculature. Mortality from handling the fish for tagging was 4%, tank trauma was 2%, and the initial tag loss was 2.5%. (20pp.)

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