Effects of Stocking on Genetics of Wild Brook Trout Populations

January 1, 1979 - Charles C. Krueger; Bruce W. Menzel

Journal or Book Title: Transactions of the American Fisheries Society

Volume/Issue: 108

Page Number(s): 277-287

Year Published: 1979

The study was undertaken to evaluate the long-term genetic impact of maintenance stocking upon wild brook trout (Salvelinus fontinalis) populations in Wisconsin. Trout were collected from streams of the Wolf and Fox River drainages and from the Osceola State Trout Hatchery. The stocking histories of the streams ranged from unstocked to heavily stocked for many years. The planted fish consisted primarily of fingerling and catchable brook and brownt rout (Salmotr utta). Blood plasma and whole-eye homogenate samples were analyzed electrophoretically for transferrin (Tf) and lactate dehydrogenas (Le dh-B2) systems. Esterase was monomorphic in all samples, but Tf and LDH displayed genetic polymorphism. The occurrence of several Tf A/A phenotypes among wild fish is notable because previous genetic studies considered the combination to be lethal. The hatchery stock was genetically distinct from most wild populations at both loci. Variation of Tf allelic frequencies among wild populations suggested an undisturbed natural geographip pattern. There were significant correlations between Ldh-B2 allelic frequencies and stream stocking histories, however, the wild type allele ecreasing in importance as stocking intensity increased. This relationship does not seem to reflect interbreeding between wild and hatchery trout. Rather, it may indicate alteration of selective pressures induced by ecological interactions between the two stocks.

DOI: 10.1577/1548-8659(1979)1082.0.CO;2

Type of Publication: Journal Article

Publisher: Mortimer House

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