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Inhibition of Salt Water Survival and Na‐K‐ATPase Elevation in Steelhead Trout (Salmo gairdneri) by Moderate Water Temperatures
Author(s) -
Adams B. L.,
Zaugg W. S.,
McLain L. R.
Publication year - 1975
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1975)104<766:ioswsa>2.0.co;2
Subject(s) - salmo , metamorphosis , juvenile , trout , smoltification , salt water , fishery , osmoregulation , biology , zoology , rainbow trout , fish <actinopterygii> , salmonidae , ecology , larva , environmental science , salinity , environmental engineering
The steelhead trout metamorphosis from a freshwater parr to a sea water‐tolerant smolt possessing the migration tendency was evaluated at six different growth temperatures ranging from 6 to 15 C during January through July. The highest temperature where a transformation was indicated was 11.3 C. By April fish reared at 6 C had elevated ATPase levels typical of smolts or migratory animals and showed 92% survival in sea water. Ten and 11.3 C‐reared fish showed a short‐lived elevation in ATPase in mid‐April alone concurrently with 100% sea water survival at that time. Only in 6 C‐reared animals did the salt water survival ability continue into May. High ATPase levels likewise were prolonged into May and June only in the 6 C‐reared group. The data indicate that metamorphosis (and therefore successful migration) of juvenile steelhead trout is directly controlled by water temperature.