The Introduction of Lahontan Cutthroat Trout into a Previously Fishless Lake: Feeding Habits and Effects upon the Zooplankton and Benthic Community

Chess, Dale W.; Gibson, Flash; Scholz, Allan T.; White, Ray J.

doi:10.1080/02705060.1993.9664857

Cited by 10 publications

(6 citation statements)

References 18 publications

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“…A large proportion of the diets of lacustrine cutthroat trout juveniles can be contributed by zooplankton, primarily large cladocerans (e.g., Daphnia spp. ; Nowak et al 2004), and limited Lahontan cutthroat trout diet data show a similar preference for larger zooplankton (Chess et al 1993). Clearly, there are limitations in extrapolating our assessments of Lahontan cutthroat trout condition from few individuals to the population level.…”

Section: Lahontan Cutthroat Troutmentioning

confidence: 90%

Evaluating the Reintroduction Potential of Lahontan Cutthroat Trout in Fallen Leaf Lake, California

Al‐Chokhachy

Peacock

Heki

et al. 2009

N American J Fish Manag

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We evaluated the potential for reintroducing Lahontan cutthroat trout Oncorhynchus clarkii henshawi, a species listed under the Endangered Species Act, into a lacustrine system where the biotic community has changed dramatically since the species' extirpation there. Since 2002, 76,547 Lahontan cutthroat trout have been reintroduced into Fallen Leaf Lake, California; we used creel surveys, diet data, mark–recapture methods, bioenergetics modeling, and netting data across seasons to evaluate the habitat use, growth, and relative abundance of Lahontan cutthroat trout and the abundance, diet, habitat use, and predation by nonnative species. Sampling totals (n = 2) and survey observations (n = 3) indicate low survival and abundance of reintroduced fish and together with creel data indicate the importance of epilimnetic habitats across size‐classes. Despite substantial growth, Lahontan cutthroat trout exhibited low condition factor values (average = 0.69). We found substantial predation pressure from a large population of lake trout Salvelinus namaycush (Ṋ = 8,799 fish; 95% confidence interval [CI] = 4,990–16,530 fish); analysis of lake trout diets showed an increase in piscivory and in the percentage of stomachs containing Lahontan cutthroat trout anchor tags with increasing predator size. Overall, we estimated that lake trout consumed over 38% of reintroduced Lahontan cutthroat trout (mean number consumed = 7,736 fish; 95% CI = 4,388–14,534 fish). With bioenergetics modeling, however, we estimated that lake trout consumed considerable amounts of salmonid biomass during this period (mean biomass = 3,137 kg; 95% CI = 1,779–5,893 kg), which greatly exceeded the biomass of Lahontan cutthroat trout reintroduced in 2006. During the stratification period, there was little overlap in habitat use between lake trout and Lahontan cutthroat trout, but overlap was high during the spring and autumn. We found moderate‐sized populations of nonnative brown trout Salmo trutta, kokanee O. nerka (lacustrine sockeye salmon), and rainbow trout O. mykiss. Together, our results suggest that Lahontan cutthroat trout have few refugia from direct and indirect negative interactions with nonnative species and that alternative approaches are needed.

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Section: Lahontan Cutthroat Troutmentioning

confidence: 90%

Evaluating the Reintroduction Potential of Lahontan Cutthroat Trout in Fallen Leaf Lake, California

Al‐Chokhachy

Peacock

Heki

et al. 2009

N American J Fish Manag

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“…En général, les introductions intentionnelles de poissons ont rarement atteint leur objectif et ont été plutôt néfastes pour les espèces indigènes et les autres taxons, par le biais de la prédation, de la compétition, de l'hybridation ou de l'introduction de maladies (ALLENDORF, 1991 (NILSSON, 1972;HARD, 1986;CHESS et al, 1993) ou bien provoquant l'émigration d'invertébrés, influencés chimiquement par la présence des truites, pour éviter la prédation (ANDERSEN et al, 1993). Dans un district aussi vaste que Kerguelen, profondément marqué par la présence humaine (surexploitation des phoques et des manchots, introductions volontaires ou accidentelles d'espèces animales et végétales), il ne peut être question de revenir à un état antérieur d'écosystème vierge.…”

Section: Impact Des Introductionsunclassified

Introduction de salmonidés en milieu vierge (Îles Kerguelen, Subantarctique) : enjeux, résultats, perspectives

Davaine

Beall

1997

Bull. Fr. Pêche Piscic.

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“…Luecke (1986) found that cutthroat trout smaller than 60 mm tended to eat plankton, but those at least 70 mm in length consumed larger, benthic prey items. Large cutthroat trout are often piscivorous, but they can feed on a broad range of prey species, including zooplankton and benthic invertebrates (Andrusak and Northcote 1971;Chess et al 1993).…”

mentioning

confidence: 99%

Ontogenetic Shifts in Habitat and Diet of Cutthroat Trout in Lake Washington, Washington

Nowak

Tabor

Warner³

et al. 2004

N American J Fish Manag

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Salmonids often display a series of ontogenetic shifts in habitat, and these may also be associated with changes in diet. For example, adfluvial populations rear in streams for several years and then migrate to lakes. The patterns of habitat use, trophic ecology, and movements of such populations are commonly studied during the riverine stages. The lacustrine period is typically less well known, but salmonids may play an important ecological role as lake piscivores. In Lake Washington, Seattle, Washington, cutthroat trout Oncorhynchus clarki are a top native piscivore and may affect the dynamics of the fish and zooplankton upon which they prey. Our objective was to study the growth, diet, and size distribution of cutthroat trout in littoral and limnetic habitats of Lake Washington, with emphasis on consumption of two of the lake's dominant pelagic planktivores: juvenile sockeye salmon O. nerka and longfin smelt Spirinchus thaleichthys. Cutthroat trout entered the lake at approximately age 2. As they grew larger, the cutthroat trout became increasingly piscivorous and tended to occupy the limnetic zone after they reached about 250 mm fork length (FL). Specifically, percentages (by wet weight) of fish in the diet of cutthroat trout increased from 22.5% for cutthroat trout smaller than 200 mm FL to over 95% for cutthroat trout larger than 400 mm FL. Fish made up a higher percentage of cutthroat trout diets in fall and winter in both the limnetic and littoral zones, and a greater proportion of fish was consumed in the limnetic zone than in the littoral zone. Variation in diet was observed among years (1995–2000), apparently reflecting the relative abundance of longfin smelt. The role of cutthroat trout both as the object of recreational fisheries and as a predator on sockeye salmon (valued in commercial and recreational fisheries) complicates management of this large, urban lake.

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The Introduction of Lahontan Cutthroat Trout into a Previously Fishless Lake: Feeding Habits and Effects upon the Zooplankton and Benthic Community

Cited by 10 publications

References 18 publications

Evaluating the Reintroduction Potential of Lahontan Cutthroat Trout in Fallen Leaf Lake, California

Evaluating the Reintroduction Potential of Lahontan Cutthroat Trout in Fallen Leaf Lake, California

Introduction de salmonidés en milieu vierge (Îles Kerguelen, Subantarctique) : enjeux, résultats, perspectives

Ontogenetic Shifts in Habitat and Diet of Cutthroat Trout in Lake Washington, Washington

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