By H. S. Majewski, M. A. Giles
Water Research, Volume 15, Issue 10, 1981, Pages 1211-1217, ISSN 0043-1354, DOI: 10.1016/0043-1354(81)90096-8.

The effects of exposure to 3.6 and 6.4 [mu]g l-1 cadmium for periods up to 178 days on cardiac and ventilatory rates, hematocrit, hemoglobin concentration and erythrocyte adenosine triphosphate concentration in adult rainbow trout, Salmo gairdneri, were investigated. Except for slight transitory responses, 3.6 [mu]g l-1 cadmium had no effect on any of the cardiovascular/respiratory parameters. Significant increases in cardiac and ventilatory rates, blood hematocrit and hemoglobin were observed in fish exposed to 6.4 [mu]g l-1 Cd over the entire exposure period while erythrocyte ATP concentration declined during the last stages of exposure. Further experiments on the responses of fish exposed to 6.4 [mu]g l-1 Cd for 30 days demonstrated an impairment of oxygen transfer across the gill. The results are discussed in terms of possible gill impairment and hyperactivity as toxic responses to cadmium.

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