Abstract
Abstract Five genera of invertebrates were fed to walleyes (Stizostedion vitreum vitreum) for 51 days after hatching to document the genera and sizes of invertebrates selected by the fish during their early development. The cladoceran Moina brachiata was selected for; the copepod Cyclops vernalis was initially eaten in the same proportion as available, but later selected for when M. brachiata was not available; and the cladocerans Daphnia magna and D. pulex and the rotifer Asplanchna sieboldi were selected against. The rotifer Brachionus sp. was not eaten. As the walleyes grew they selected for progressively larger cladocerans but not for progressively larger C. vernalis. Significantly more organisms were eaten by walleyes collected at 1100 hours than by those collected at 2300 hours initially, but significantly fewer after 15 days of feeding.
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