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1 <br />' abundance only at the Yampa River statio: <br />' years could be a consequence of low abun <br />spawning areas, high mortality of eggs or <br />transport, sampling error, or other factors. <br />High intra-annual recruitment vari; <br />' and middle Green River, 1990-1996 was r <br /> produced from spawning areas. Instead, h <br />' of factors that differentially affect growth <br /> seem well-adapted to the fluctuating envir <br />' Thus, physical factors may regulate recrui <br /> rare instances. Understanding the relative <br />' Colorado squawfish, including effects of c <br /> predators, is critical to management and re <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />1 <br /> <br /> <br /> <br />Low abundance during either low or high discharge <br />ice of adults and low production of larvae at <br />vae at spawning areas or during downstream <br />>n of juvenile Colorado squawfish in both the lower <br />usually the result of inadequate numbers of larvae <br />i annual recruitment variation may be a consequence <br />1 survival of early life stages. Colorado squawfish <br />rental conditions with which they have evolved. <br />ant of age-0 Colorado squawfish only in relatively <br />~portance of mechanisms regulating recruitment of <br />;harge, habitat availability, and non-native fishes <br />very of this species. <br />iv <br />