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Determination of relative survival of two stocked walleye populations and resident natural-origin fish by microsatellite DNA parentage assignment

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Abstract:

Walleye (Stizostedion vitreum) from two northern Minnesota spawning stations (Pike River, Hudson Bay drainage, and Little Cutfoot Sioux Lake, Mississippi River drainage) simultaneously stocked as fry into five southern Minnesota lakes had different survival rates. One year after stocking, Pike River walleye were more abundant than their original proportion of 46.5% of the stocked fish, but by the end of their second summer, neither population had a clear survival advantage. In the three lakes where walleye were consistently sampled, natural-origin walleye that descended from previous stockings significantly increased in percent of all sampled walleye over the study (P = 0.001). The unmarked and untagged stocked fish (N = 566) were assigned to their source population by comparing their genotypes at nine microsatellite DNA loci to the known genotypes of the parent pairs crossed in a hatchery (parentage assignment). Fish not assigned to a parent pair were considered to be the product of natural reproduction (N = 177) by previously stocked fish. Simulations indicated that natural-origin walleye were sufficiently excluded from assignment to stocked fish parent pairs so as not to bias the comparison. Parentage assignment is a powerful population discrimination tool if genotypes are known for all parent pairs from all but one putative source.

Des dorés (Stizostedion vitreum) provenant de deux stations de fraye du nord du Minnesota (la Pike dans le bassin versant de la baie de Hudson et le lac Little Cutfoot Sioux dans le bassin du Mississippi) et ayant servi à aveliner cinq lacs du sud du Minnesota ont eu des taux de survie différents. Un an après l'alevinage, les dorés provenant de la Pike représentaient plus que leur proportion d'origine de 46,5 % des poissons introduits; cependant, à la fin du second été, ni l'une ni l'autre des populations ne présentait de survie clairement supérieure. Dans les trois lacs où les dorés ont été échantillonné régulièrement, les dorés d'origine naturelle issus des alevinages antérieurs représentaient un pourcentage significativement de plus en plus élevé (P = 0,001) des dorés totaux au cours de l'étude. Les poissons sans marque ni étiquette (N = 566) ont été assignés à leur population d'origine par comparaison de leur génotype à neuf locus microsatellites de l'ADN à des génotypes connus des couples de parents croisés en pisciculture (assignation de filiation). Les poissons non assignés à un couple parental (N = 177) étaient considérés être le fruit de la reproduction naturelle de poissons alevinés antérieurement. Des simulations ont confirmé que suffisamment de dorés d'origine naturelle avaient été exclus de l'assignation à des couples parentaux de pisciculture pour ne pas fausser la comparaison. L'assignation de filiation est un outil puissant pour la reconnaissance des populations si on connaît les génotypes de tous les couples parentaux de toutes sauf une des sources possibles.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: February 1, 2002

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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