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Northern pike, Esox lucius, stocked in the Yampa River in 1977, invaded the mainstream Green River by 1981 and subsequently increased in range and abundance. The speed of this invasion is indicated by two recaptured pike that moved 78 and 110 km, respectively, downstream in about one year. Pike stomachs (n = 123) were usually empty (54.5%), but some contained fish (43%) and nonfish items (2.4%). Red shiner, Notropis lutrensis, and fathead minnow, Pimephales promelas, predominated among the 12 fish species eaten. Walleye, Stizostedion vitreum, presumably introduced to the Green River drainage in the 1960s, was widely distributed but low in abundance. Most of 61 adult walleye stomachs contained food (60.7%) ; of 6...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Green River Watershed (Wyo.-Utah),
Pike,
Walleye (Fish),
Western North American Naturalist
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