Single-Pass Electrofishing Predicts Trout Abundance in Mountain Streams with Sparse Habitat

Kruse, C.W.; Hubert, Wayne A.; Rahel, Frank J.

doi:10.1577/1548-8675(1998)018<0940:spepta>2.0.co;2

Cited by 96 publications

(99 citation statements)

References 16 publications

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“…For reaches where only one removal pass was made in 2000, estimates of abundance were made by using data from the multipass reaches to construct a linear relationship between the number of brook trout captured in first passes and subsequent maximum likelihood abundance estimates. From these relationships, we predicted brook trout abundance (and 95% prediction intervals) for the reaches where only a single removal pass was made (Lobón-Cerviá and Utrilla 1993; Jones and Stockwell 1995;Kruse et al 1998). Separate regression models were built for brook trout smaller than 80 mm TL and for those 80 mm TL and larger.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of an Unsuccessful Brook Trout Electrofishing Removal Project in a Small Rocky Mountain Stream

Meyer

Lamansky

Schill

2006

N American J Fish Manag

108

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Abstract.-In the western United States, exotic brook trout Salvelinus fontinalis frequently have a deleterious effect on native salmonids, and biologists often attempt to remove brook trout from streams by means of electrofishing. Although the success of such projects typically is low, few studies have assessed the underlying mechanisms of failure, especially in terms of compensatory responses. A multiagency watershed advisory group (WAG) conducted a 3-year removal project to reduce brook trout and enhance native salmonids in 7.8 km of a southwestern Idaho stream. We evaluated the costs and success of their project in suppressing brook trout and looked for brook trout compensatory responses, such as decreased natural mortality, increased growth, increased fecundity at length, and earlier maturation. The total number of brook trout removed was 1,401 in 1998, 1,241 in 1999, and 890 in 2000; removal constituted an estimated 88% of the total number of brook trout in the stream in 1999 and 79% in 2000. Although abundance of age-1 and older brook trout declined slightly during and after the removals, abundance of age-0 brook trout increased 789% in the entire stream 2 years after the removals ceased. Total annual survival rate for age-2 and older brook trout did not decrease during the removals, and the removals failed to produce an increase in the abundance of native redband trout Oncorhynchus mykiss gairdneri. Lack of a meaningful decline and unchanged total mortality for older brook trout during the removals suggest that a compensatory response occurred in the brook trout population via reduced natural mortality, which offset the removal of large numbers of brook trout. Although we applaud WAG personnel for their goal of enhancing native salmonids by suppressing brook trout via electrofishing removal, we conclude that their efforts were unsuccessful and suggest that similar future projects elsewhere over such large stream lengths would be costly, quixotic enterprises.

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Section: Methodsmentioning

confidence: 99%

Evaluation of an Unsuccessful Brook Trout Electrofishing Removal Project in a Small Rocky Mountain Stream

Meyer

Lamansky

Schill

2006

N American J Fish Manag

108

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“…When several fishing runs were performed, population densities (individuals 100m )2 for each species) were estimated according to Higgins (1985). When only one fishing run was performed, densities were estimated according to relations of catch efficiencies between single and depletion fishing presented in the Swedish Board of Fisheries' extensive data base (see also Kruse et al 1998, Degerman & Sers 1999, Edwards et al 2003.…”

Section: Methodsmentioning

confidence: 99%

Are fish populations in temperate streams affected by crayfish? – A field survey and prospects

et al. 2006

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SynopsisFish populations may be affected by predation and competition from various types of organisms, among which crayfish have been suggested as important actors. We here present results from stream surveys, suggesting that neither native noble, Astacus astacus, nor introduced signal crayfish, Pacifastacus leniusculus, necessarily affect fish population densities in temperate stream communities. Comparisons of fish densities within stream sites between years with absence and presence of crayfish showed no effect of either crayfish species. A further analysis of changes in fish densities between periods without and with crayfish in low, intermediate and high densities revealed that crayfish density did neither have an effect on fish densities. Our study is one of exceptionally few that consider the above aspects in long-term perspectives in natural systems, and we discuss that previously reported divergent results of crayfish effects on fish may be highly dependent on specific species and methods used, and that the effects of crayfish on fish populations deserve further attention to enable reliable predictions of community processes in streams.

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“…Naargelang de beoogde resultaten wordt een locatie één of tweemaal afgevist (CEN, 2002, Penczak, 2011. Soms wordt de rivier afgespannen met een net voor het voorkomen van ontsnappingen (Kruse et al, 1998). Deze methode is echter niet praktisch vooral bij sterke stroming.…”

Section: Rivierenunclassified

De biologische kwaliteit van waterlopen, kanaal en vijvers in het Brussels Hoofdstedelijk Gewest in 2016.

Onsem

Breine

Triest

2017

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Single-Pass Electrofishing Predicts Trout Abundance in Mountain Streams with Sparse Habitat

Cited by 96 publications

References 16 publications

Evaluation of an Unsuccessful Brook Trout Electrofishing Removal Project in a Small Rocky Mountain Stream

Evaluation of an Unsuccessful Brook Trout Electrofishing Removal Project in a Small Rocky Mountain Stream

Are fish populations in temperate streams affected by crayfish? – A field survey and prospects

De biologische kwaliteit van waterlopen, kanaal en vijvers in het Brussels Hoofdstedelijk Gewest in 2016.

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