Factors Influencing Poststocking Dispersal of Razorback Sucker

Mueller, Gordon; Marsh, Paul C.; Foster, Dean K.; Ulibarri, Manuel; Burke, Tom

doi:10.1577/1548-8675(2003)023<0270:fipdor>2.0.co;2

Cited by 12 publications

(14 citation statements)

References 20 publications

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“…behaviorally deficient; Mirza & Chivers 2000). There is a growing body of research focused on the training or acclimation of hatcheryreared fish for increased survival (Maynard et al 1995, Brown & Day 2002, Mueller et al 2003, Vilhunen 2006. The increase in the probability of survival of fish longer than 200 mm in our study may indicate that predation of smaller fish is a factor.…”

Section: Discussionmentioning

confidence: 64%

Endangered species augmentation: a case study of alternative rearing methods

Rasmussen¹,

Belk²,

Peck³

2009

Endang. Species. Res.

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Stocking of artificially propagated fish has been adopted by many endangered fish recovery programs as a key component of their recovery plans. However, quantifying successful recruitment of individuals to the adult population is difficult, especially in long-lived species. To evaluate the effect of the rearing environment on recruitment in the native environment, we compared post-stocking survival of the endangered June sucker Chasmistes liorus reared under conventional hatchery practices to those reared in 2 reservoirs. We used logistic regression analysis to compare patterns of survival among populations including total length and condition at the time of stocking as continuous covariates. The estimated probability of survival for reservoir-reared fish from Red Butte and Camp Creek Reservoirs was 0.19 and 0.05, respectively, compared to 0.05 for hatchery-reared fish. Length and condition were positively related to post-stocking survival. On average, reservoir-reared fish performed better than hatchery-reared fish. It is not clear what mechanism led to increased survival for the Red Butte source, but several studies have demonstrated the importance of acclimation to the physical environment and the threat of predation. We suggest that augmentation procedures would produce more recruits to the adult population if they incorporate grow-out or at least acclimation in more natural environments than that provided by hatcheries prior to release in Utah Lake.

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Section: Discussionmentioning

confidence: 64%

Endangered species augmentation: a case study of alternative rearing methods

Rasmussen¹,

Belk²,

Peck³

2009

Endang. Species. Res.

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“…Direction.-Most movements, regardless of leg, were in a downstream direction. It is unknown whether downstream movements were active intentional movements to preferred habitat or passive displacement (Marsh and Brooks 1989;Mueller et al 2003). Razorback suckers stocked into upstream, higher gradient, or canyon reaches, such as CO3, may actively seek downstream, lower gradient, slow-water reaches, such as CO2.…”

Section: Movementmentioning

confidence: 99%

Survival Rates and Movement of Hatchery‐Reared Razorback Suckers in the Upper Colorado River Basin, Utah and Colorado

Zelasko¹,

Bestgen²,

White³

2010

Trans Am Fish Soc

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We used tag–recapture data to estimate apparent survival and capture probability for 119,129 hatchery‐reared, federally endangered razorback suckers Xyrauchen texanus stocked into upper Colorado River basin streams during 1995–2005. Effects investigated included reach, year, and season of stocking; fish total length (TL) at time of stocking; survival in the first year after stocking versus in subsequent years; and sampling effort. Recapture data were also used to describe poststocking movement. First‐year survival rate for stocked razorback suckers of average TL (252.5 mm) was low: 0.05 (95% confidence interval [CI], 0.042–0.071). Total length at stocking and first‐year survival were positively correlated; survival approached zero for fish smaller than 200 mm TL but increased to 0.75 or higher for the few fish larger than 500 mm. Season of stocking had a large effect on razorback sucker first‐year survival; the predicted rate for average‐length fish stocked in summer was less than 0.02 (CI, 0.012–0.022), but it was 0.07 (0.044–0.094), 0.08 (0.057–0.100), and 0.08 (0.057–0.118) for fish stocked in spring, autumn, and winter, respectively. The overall subsequent‐year survival rate for razorback suckers was estimated to be 0.75 (CI, 0.688–0.801). Capture probabilities were relatively low, ranging from 0.002 to 0.128 for fish of average TL. The mean minimum distance traveled, elapsed time, and rate of travel by razorback suckers between recaptures were 54.7 km (range, 0–514.9 km), 254 d (0–3,164 d), and 0.87 km/d (0–55.37 km/d), respectively. Movement was more frequent out of Colorado and Gunnison River stocking reaches (36.9%; range, 30.1–100%) than Green River stocking reaches (7.7%; range, 2.9–10.3%). Our recommendations include ceasing summer stocking, performing cost ‐benefit analyses of increasing TL at stocking, employing a standardized stocking protocol, and developing a comprehensive razorback sucker monitoring program, implementation of which should enhance recovery prospects for razorback suckers in the upper Colorado River basin.

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“…El acondicionamiento por ejercicio podría mejorar la condición física de los matalotes jorobados criados en cautiverio y así aumentar la eficacia de la reintroducción. razorback suckers tend to move downstream, often great distances from the release site (Mueller et al 2003). Razorback suckers migrate long distances as part of their natural life history (Tyus and Karp 1990, Modde and Irving 1998, Mueller 2006.…”

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“…The reasons for this poststocking movement are unknown but may be related to behavior, stress, or the conditions under which the fish were raised. Fish that have been reared in ponds without flowing water may not be physiologically able to handle the combination of flowing water and high densities of nonnative predators (Mueller et al 2003).…”

mentioning

confidence: 99%