Larval Colorado Squawfish (Ptychochielus lucius Girard) in the Upper Colorado River Basin, Colorado, 1979-1981

Haynes, Charles M.; Lytle, T. A.; Wick, Emmanuel; Muth, Robert T.

doi:10.2307/3670766

Cited by 23 publications

(12 citation statements)

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“…Water temperature is a cue for spawning of temperate-zone fishes. Colorado squawfish begin spawning when temperatures reach 20-22°C (Hamman 1981, Tyus & McAda 1984, Haynes et al 1984) -normally during July or August in the upper basin (Fig. 3) -and embryos hatch 4-5 days later (Hamman 1981).…”

Section: Synthesismentioning

confidence: 99%

Interaction of slow growth and increased early-life mortality: an hypothesis on the decline of Colorado squawfish in the upstream regions of its historic range

Kaeding

Osmundson

1988

Environ Biol Fish

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SynopsisThe Colorado squawfish, Ptychocheilus lucks, the principal native piscivore of the Colorado River basin, was once widespread and abundant in large rivers and their major tributaries. It occurs today only in the upstream regions of its historic range and is threatened with extinction. Growth rate of the species there is much slower than its potential rate and the rate that might once have been typical in lower-basin rivers. We develop the hypothesis that the interaction of slow growth and increased early-life mortality is an important cause of the decline of Colorado squawfish in the upper basin. We use a growth-rate versus temperature relation for Colorado squawfish to compare temperature regimes of historic and present habitats, and we describe the strong, positive relation between our measure of temperature-regime suitability and first-year growth of Colorado squawfish in upper-basin rivers. The unusually small size of the age-0 fish going into winter might be an important factor affecting recruitment to the adult stock. Simulations showed how the effect of increased early-life mortality can be especially significant on populations of slow-growing fishes. Predation by introduced fishes, as well as other man-induced causes of increased early-life mortality, probably contributed importantly to the decline of Colorado squawfish in the remaining habitat. Management efforts that might help this endangered species to recover include water management to enhance temperatures for growth, and the control of important introduced fishes.

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Section: Synthesismentioning

confidence: 99%

Interaction of slow growth and increased early-life mortality: an hypothesis on the decline of Colorado squawfish in the upstream regions of its historic range

Kaeding

Osmundson

1988

Environ Biol Fish

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“…Age 0 P. lucius often use low-velocity habitats in lower portions of large rivers (Haynes et al 1984;Osmundson et al 1998), whereas adults can be highly mobile and often use mainstem river habitats (Osmundson et al 1998). Information on subadult habitat use is limited, but they also appear to be highly mobile and can use mainstem as well as small tributary habitats (Fresques et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Prey and non‐native fish predict the distribution of Colorado pikeminnow (Ptychocheilus lucius) in a south‐western river in North America

Franssen

Durst

2013

Ecology of Freshwater Fish

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Colorado pikeminnow (Ptychocheilus lucius) has been extirpated from a large portion of its historical range in the Colorado River basin, USA. A repatriation effort via stocking of juvenile P. lucius in the San Juan River, NM, CO and UT has resulted in limited recruitment of individuals into an adult population. Understanding biotic and abiotic factors that limit their persistence in the Colorado River basin will be a critical step in providing for their recovery. To elucidate potential recruitment barriers in the San Juan River, we assessed relationships between the numbers of two age classes of P. lucius and prey, competitors and predators collected at a 1.6 km reach scale between 2003 and 2012. We used an information theoretical approach to rank candidate models testing the relative importance of these biotic conditions in predicting the spatial distribution of P. lucius. We found positive relationships between the numbers of P. lucius ≤200 mm total length (TL) collected and catch per unit effort (CPUE) of native prey among reaches. For P. lucius >200 mm TL (individuals that are likely completely piscivorous), we found positive associations between the numbers of P. lucius collected and CPUE of total prey and CPUE of potential non-native competitors in each reach. Our data suggest size-specific affinities of P. lucius for native and non-native prey as well as the potential for negative interactions between P. lucius and non-native competitors may contribute to limited recruitment of juvenile P. lucius into an adult population in the San Juan River.

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“…Squawfish management in the upper Colorado basin is now centered on a multiagency consortium coordinated by the USFWS (1987a), and there is optimism for its recovery by the end of this century (USFWS 1987a;Rose and Hamill 1988;Wydoski and Hamill, Knowledge of spawning areas, nursery habitats, and concentration areas was almost nonexistent, and they remained poorly documented until the 1980s (Tyus et al 1981Haynes et al 1984;Tyus and McAda 1984;Archer et al 1985Archer et al , 1986Tyus 1985Tyus , 1986Nesler et al 1988), when new and better technology and sufficient funds enabled accelerated research. Relative densities for adults, juveniles, and young have now been mapped, and management strategies have been drafted (Archer et al 1986;USFWS 1987a).…”

Section: Introductionmentioning

confidence: 99%

Battle against extinction: native fish management in the American West

1992

Choice Reviews Online

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Larval Colorado Squawfish (Ptychochielus lucius Girard) in the Upper Colorado River Basin, Colorado, 1979-1981

Cited by 23 publications

References 0 publications

Interaction of slow growth and increased early-life mortality: an hypothesis on the decline of Colorado squawfish in the upstream regions of its historic range

Interaction of slow growth and increased early-life mortality: an hypothesis on the decline of Colorado squawfish in the upstream regions of its historic range

Prey and non‐native fish predict the distribution of Colorado pikeminnow (Ptychocheilus lucius) in a south‐western river in North America

Battle against extinction: native fish management in the American West

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