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Establishment of Reproducing Populations of Brook Trout after Stocking of Interstrain Hybrids in Precambrian Shield Lakes
Author(s) -
Fraser J. M.
Publication year - 1989
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(1989)009<0352:eorpob>2.3.co;2
Subject(s) - fontinalis , stocking , trout , salvelinus , domestication , biology , hybrid , strain (injury) , fishery , precambrian , fish <actinopterygii> , ecology , botany , paleontology , anatomy
Planted interstrain‐hybrid and wild‐strain brook trout Salvelinus fontinalis established self‐propagating populations in four Precambrian Shield lakes in which earlier plantings of a domestic strain had failed to reproduce successfully. The purpose of this study was to document successful reproduction by interstrain‐hybrid and wild brook trout and to suggest reasons why the domestic strain failed to reproduce. Nearly all brook trout were marked before stocking so that planted fish could be distinguished from lake‐reared fish in gill‐net catches. The tentative conclusion is that during its long period of domestication (more than 20 generations), the domestic strain had lost much of its ability to locate and use suitable spawning areas. A secondary factor was the poor survival to maturity of the domestic strain relative to the hybrid and wild strains.