Physiological Effects of Brief Air Exposure in Exhaustively Exercised Rainbow Trout (Oncorhynchus mykiss): Implications for "Catch and Release" Fisheries

R. A. Ferguson; B. L. Tufts

doi:10.1139/f92-129

journal article Jun 01, 1992

Physiological Effects of Brief Air Exposure in Exhaustively Exercised Rainbow Trout (Oncorhynchus mykiss): Implications for "Catch and Release" Fisheries

R. A. Ferguson B. L. Tufts

Canadian Journal of Fisheries and Aquatic Sciences Vol. 49 No. 6 pp. 1157-1162 · Canadian Science Publishing

View at Publisher Save 10.1139/f92-129

Abstract

Rainbow trout (Oncorhynchus mykiss) which were air exposed for 60 s after exhaustive exercise initially had a much larger extracellular acidosis than trout which were only exercised. In both groups, however, plasma pH returned to normal by 4 h. Blood lactate concentrations were also greater in the air-exposed fish and continued to increase throughout the experiment. During air exposure, there was retention of carbon dioxide in the blood, and oxygen tension (Po2) and hemoglobin:oxygen carriage (Hb:O2) both fell by over 80%. After 30 min of recovery, however, blood gases resembled those in fish which were only exercised. Finally, survival after 12 h was 10% in control fish and 88% in the exercised fish but fell to 62 and 28% in fish which were air exposed for 30 and 60 s, respectively, after exercise. These results indicate that the brief period of air exposure which occurs in many "catch and release" fisheries is a significant additional stress which may ultimately influence whether a released fish survives.

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Details

Published: Jun 01, 1992
Vol/Issue: 49(6)
Pages: 1157-1162
License: View

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Cite This Article

R. A. Ferguson, B. L. Tufts (1992). Physiological Effects of Brief Air Exposure in Exhaustively Exercised Rainbow Trout (Oncorhynchus mykiss): Implications for "Catch and Release" Fisheries. Canadian Journal of Fisheries and Aquatic Sciences, 49(6), 1157-1162. https://doi.org/10.1139/f92-129

Physiological Effects of Brief Air Exposure in Exhaustively Exercised Rainbow Trout (Oncorhynchus mykiss): Implications for "Catch and Release" Fisheries

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