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Longevity and Growth of Hormone‐Sterilized Kokanee
Author(s) -
Johnston N. T.,
Parkinson E. A.,
Tsumura K.
Publication year - 1993
Publication title -
north american journal of fisheries management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 72
eISSN - 1548-8675
pISSN - 0275-5947
DOI - 10.1577/1548-8675(1993)013<0284:lagohs>2.3.co;2
Subject(s) - longevity , methyltestosterone , fish <actinopterygii> , hormone , biology , oncorhynchus , montane ecology , significant difference , fishery , zoology , medicine , ecology , endocrinology , genetics
Marked fingerlings of kokanee Oncorhynchus nerka that were sterilized by treatment with 17∝‐methyltestosterone and released into an oligo–mesotrophic coastal montane lake (Salsbury Lake, British Columbia) showed greater longevity than untreated control groups. Some hormone‐treated kokanees survived to age 7, 2 years beyond the apparent maximum lifespan of untreated fish. The proportion of hormone‐treated fish among recovered fish that were older than age 3 was significantly greater than the proportion ofhormone‐treated fish stocked, but this difference lessened with increasing hormone dosage, Despite increased longevity, the ultimate size of hormone‐treated kokanees did not increase beyond that of untreated fish in this lake.