Premium
Relative Survival of Hatchery‐Reared Lake Trout, Brook Trout, and F 1 Splake Stocked in Low‐pH Lakes
Author(s) -
Snucins E. J.
Publication year - 1992
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(1992)012<0460:rsohrl>2.3.co;2
Subject(s) - salvelinus , trout , fontinalis , stocking , hatchery , fishery , biology , zoology , brown trout , ecology , fish <actinopterygii>
A matched‐planting experiment was conducted to determine the most suitable salmonid genotype for stocking in former lake trout lakes that currently are too acidic to support lake trout reproduction. Hatchery‐reared lake trout Salvelinus namaycush , brook trout Salvelinus fontinalis , and F 1 splake S. namaycush × S. fontinalis were planted in May 1989 at age 18–19 months in four lakes with pH values of 4.9–5.4. Relative survival of the three genotypes was assessed during a 4‐d holding period immediately after stocking and by gillnetting during the summer of 1990. During the 4‐d holding period, survival of lake trout (23%) was significantly lower than that of brook trout (98%) and splake (92%). Gillnetting recovery rates were 0–0.9% for lake trout, 0–1.8% for brook trout, and 1.1–15.0% for splake. The results of this study suggest that splake are the most suitable of these three salmonid taxa for stocking on a put–grow–take basis in lakes of pH 4.9–5.4