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The effects of hypophysectomy, prolactin therapy and environmental calcium on freshwater survival and salinity tolerance in the brown trout Salmo trutta L.
Author(s) -
Oduleye S. O.
Publication year - 1976
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.1976.tb04695.x
Subject(s) - salmo , euryhaline , biology , brown trout , salinity , calcium , hypophysectomy , fishery , rainbow trout , prolactin , zoology , endocrinology , medicine , fish <actinopterygii> , hormone , ecology
Hypophysectomy resulted in a loss of ability of the euryhaline salmonid, Salmo trutta to survive in fresh water. The mean survival time was 4–5 days. Maintenance in a medium containing 5 mM calcium increased the mean survival time to 8 days while 10 mM decreased it. Injection of 0–21.U./gm prolactin enabled hypophysectomized fish to survive the 2‐week duration of the experiment. High environmental calcium, or pre‐adaptation to a medium of high calcium, increased salinity tolerance of the brown trout probably by promoting a quick return of plasma electrolyte concentration to normal after transfer to sea water.