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Research Bulletin (Iowa Agriculture and Home Economics Experiment Station)

Abstract

Mortality in submature channel catfish, Ictalurus punctatus (Rafinesque), caught in the Mississippi River and stocked in Iowa streams and ponds, led to this investigation in 1961-1963. The major findings can be summarized as follows:

The mean concentration of lactic acid in the blood of unexercised channel catfish varied from 2.3 to 7.6 mg/100 ml of whole blood. That of fish subjected individually to forced exercise varied from 21.1 to 44.1 mg/100 ml after 5 minutes of exercise and from 59.1 to 67.6 mg/100 ml after 15 minutes of exercise. A lower concentration of lactic acid, 28.2 mg/100 ml, for fish exercised 15 minutes in a group indicates that fish exercised in a group were not subjected to as strenuous muscular activity as were those exercised individually. Mean lactic acid values were usually greater at higher temperatures, both for unexercised and exercised fish.

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