Temperature Selection of Atlantic Salmon ( Salmo salar ) and Brook Trout ( Salvelinus fontinalis ) as Influenced by Various Chlorinated Hydrocarbons

• Published in: Journal of the Fisheries Research Board of Canada
• Main Author: Peterson, R. H.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 1973
• Subjects: General Medicine; Atlantic salmon; Salmo salar
• Online Access: http://dx.doi.org/10.1139/f73-179; http://www.nrcresearchpress.com/doi/pdf/10.1139/f73-179

The effects of previous exposure to p,p′-DDT, o,p′-DDT, p,p′-DDD, p,p′-DDE, and methoxychlor on temperature selection by juvenile Atlantic salmon (Salmo salar) in a horizontal temperature gradient were similar. Exposure to low concentrations resulted in no change or a decrease in selected temperatures as compared to control values of about 16 C. Exposure to higher concentrations raised selected temperatures. The concentrations of the substances required to produce a given effect varied as: p,p′-DDT≥p,p′-DDD> methoxychlor >o,p′-DDT>p,p′-DDE. Exposure levels of p,p′-DDA≤ 8 ppm did not alter temperature selection nor did exposure to Aroclor ® 1254, a polychlorinated biphenyl (PCB) preparation at 2 ppm. Aldrin lowered temperature selection at 0.1–0.15 ppm. In a vertical gradient, brook trout (Salvelinus fontinalis) previously exposed to p,p′-DDT and p,p′-DDD selected higher temperatures than controls.