Endangered species augmentation: a case study of alternative rearing methods

Rasmussen, J. E.; Belk, Mark C.; Peck, Steven L.

doi:10.3354/esr00219

Cited by 18 publications

(25 citation statements)

References 39 publications

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“…The authors recommend that fullfledged augmentation programs begin with an initial exploration of optimal release sizes and timing and use a variety of rearing techniques before full program implementation. Rasmussen et al (2009) also found a similar ''optimal'' length of stocking (roughly 350 mm TL), and more importantly a significant difference in survival related to captive rearing location (hatchery vs. reservoir).…”

Section: Program Evaluationsupporting

confidence: 52%

“…Relaxed natural and sexual selection pressures are compounded by increased domestication selection, resulting in reduced survival in the wild (Evans et al 2014). In addition, developmental phenotypic plasticity may drive trait divergence between wild and captive individuals (Belk et al 2008;Rasmussen et al 2009;Evans et al 2014). In a comprehensive review of the relative reproductive success of early-generation hatchery salmon, captive-origin fish were found to possess half the reproductive success of their wild-origin counterparts (Christie et al 2014a).…”

Section: Recommendations For Propagation: Balancingmentioning

confidence: 99%

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Considerations for the Propagation and Conservation of Endangered Lake Suckers of the Western United States

Day

Jacobs

Rasmussen

2017

Journal of Fish and Wildlife Management

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Decades of persistent natural and anthropogenic threats coupled with competing water needs have compromised numerous species of freshwater fishes, many of which are now artificially propagated in hatcheries. Low survival upon release is common, particularly in systems with substantial nonnative predator populations. Extensive sampling for Shortnose (Chasmistes brevirostris) and Lost River Suckers (Deltistes luxatus) in the Klamath River Basin on the California-Oregon border have failed to detect any new adult recruitment for at least two decades, prompting an investigation into artificial propagation as an extinction prevention measure. A comprehensive assessment of strategies and successes associated with propagation for conservation restocking has not been performed for any Catostomid. Here, we review available literature for all western lake sucker species to inform propagation and recovery efforts for Klamath suckers and summarize the relevance of these considerations to other endangered fishes.

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Section: Program Evaluationsupporting

confidence: 52%

Section: Recommendations For Propagation: Balancingmentioning

confidence: 99%

Considerations for the Propagation and Conservation of Endangered Lake Suckers of the Western United States

Day

Jacobs

Rasmussen

2017

Journal of Fish and Wildlife Management

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“…As a non‐salmonid example, June suckers Chasmistes liorus (Catostomidae) reared in reservoirs prior to release had better post‐release performance than hatchery‐reared individuals in one case, but not in another (Rasmussen et al . ).…”

Section: Treatments Closely Related To Structural Enrichmentmentioning

confidence: 97%

“…Rainbow trout reared in ponds with added structures during the last months preceding smoltification had enhanced physiological smolt characteristics, as compared to fish kept in concrete raceways (Zydlewski et al 2003) and marine survival of the same species have been improved by pond rearing as compared to rearing in raceways (Tipping 1998). As a non-salmonid example, June suckers Chasmistes liorus (Catostomidae) reared in reservoirs prior to release had better post-release performance than hatchery-reared individuals in one case, but not in another (Rasmussen et al 2009).…”

Section: Pond Rearingmentioning

confidence: 99%

Environmental enrichment for fish in captive environments: effects of physical structures and substrates

2014

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Structural environmental enrichment, that is, a deliberate addition of physical complexity to the rearing environment, is sometimes utilized to reduce the expression of the undesirable traits that fish develop in captivity. Increasing demands and regulations regarding usage of enrichment to promote fish welfare also make investigations on the effects of enrichment important. Here, we sythesize the current state‐of‐the‐art knowledge about the effects of structural environmental enrichment for fish in captive environments. We find that enrichment can affect several aspects of the biology of captive fish, for example, aggression, stress, energy expenditure, injury and disease susceptibility. Importantly, these effects are often varying in direction and magnitude, and it is clear that just addition of structure is not a solution to all problems in fish rearing. Each species and life stage needs special consideration with respect to its natural history and preferences. A multitude of different enrichment types has been investigated and many studies investigate several enrichment components at the same time, making comparisons among studies difficult. To the present date, the majority of efforts have been directed to investigate salmonid fish in stock‐fish hatcheries and cichlids from a basic research perspective. Some contexts are under‐studied with respect to environmental enrichment, for instance effects on results in basic research and welfare effects in display aquaria. There are many research opportunities left within this field. However, future studies could utilize experimental designs which make it possible to discriminate between effects of different environmental manipulations to a higher degree than what has been performed to this date.

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“…The brood lots represent a refuge for the species and are to be used to produce fish to augment the wild population. Captiveraised June sucker have been transferred to the lake on a nearly annual basis beginning in the early 1990's [4,5]. Over the last two decades several hundred thousand offspring generated from captive brood lots have been stocked back into Utah Lake to augment the wild-produced population.…”

Section: Introductionmentioning

confidence: 99%

Building a Better June Sucker: Characterization of Mouth Shape in the Captive Brood Stock

Belk¹,

Maxwell²,

Laidlaw³

et al. 2016

TOFISHSJ

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June sucker, Chasmistes liorus, is an endangered lake sucker endemic to Utah Lake, Utah, USA. Over the last two decades, captive-raised June suckers have been stocked into Utah Lake to augment the wild population. However, it has become apparent that the fish stocked from captive stock may not always represent the typical June sucker morphology. To determine the utility of current captive brood lots to produce June sucker phenotypes, we characterized shape of the lip lobes on the lower jaw of each brood lot. We obtained offspring from within-lot crosses and characterized shape of the lower lips using geometric morphometrics. We compared shape of brood lots to reference samples of June sucker and reference samples of the co-occurring sister species, Utah sucker (Catostomus ardens). Mean shape of the lower lips among brood lots varies from typical June sucker morphology to shapes typical of Utah sucker. Three brood lots had mean shape scores somewhat similar to the reference June sucker mean, and five brood lots had mean shape scores more similar to the reference Utah sucker mean. All other brood lots were intermediate representing hybrid phenotypes. Utilization of all brood lots on a roughly equal basis for augmentation in Utah Lake will likely result in the loss of typical June sucker morphology in the lake within a few decades. We recommend use of brood lots that exhibit June sucker morphology and discontinuance of use of brood lots that represent Utah sucker morphology. In addition, selection on lower lip shape in captive brood lots may be required to recreate June sucker phenotypes from captive brood stock.

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Endangered species augmentation: a case study of alternative rearing methods

Cited by 18 publications

References 39 publications

Considerations for the Propagation and Conservation of Endangered Lake Suckers of the Western United States

Considerations for the Propagation and Conservation of Endangered Lake Suckers of the Western United States

Environmental enrichment for fish in captive environments: effects of physical structures and substrates

Building a Better June Sucker: Characterization of Mouth Shape in the Captive Brood Stock

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