Successive removals with electrical fishing gear — a suitable method for making populations estimates in small streams

Libosvarsky, J.

doi:10.1080/03680770.1965.11895815

Cited by 2 publications

(5 citation statements)

References 4 publications

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“…In addition, many authors have described the importance of biotic and abiotic factors on the effectiveness of electrofishing. The biotic factors are: fish body size (Funk, 1949;Backiel, 1964;Lelek, 1974), specific species composition (Lariinore, 1961;Lihosvarsky & Lelek, 1965;Libosvarsky, 1966), behaviour (Larimore, 1961;Mahon, 1980). These conclusions are confirmed by the results of this study which also considered the influence of fish-stock-density and the shape of the fish body.…”

Section: Discussionsupporting

confidence: 70%

“…Therefore, when using them to analyse fish communities in small rivers, the vulnerability of the fish population throughout the fishing efforts must be unchanged (e.g. Libosvarsky, 1966). But published data throw doubt on this method: Lelek (1966) and Cross & Stott (1975) showed that fish become less sensitive to capture after the first electrofishing, and Mahon (1980) showed a decline in capture probability in successive fishing.…”

Section: Discussionmentioning

confidence: 99%

“…are more difficult to capture than trout; grayling occur in deep pools which enable them to avoid approaching fishermen, and sculpins are difficult to catch because of their benthic habitat. Similar conclusions were reached by Libosvarsky (1966).…”

Section: Discussionmentioning

confidence: 99%

“…after the last fishing, and was neutralized with potasium permanganate just below the lower net. To avoid the negative effect of low water temperature on electrofishing efficiency (Libosvarsky, 1966;Lamarque, 1967), samples were only taken at temperatures above 10°C. The negative effect of water conductivity (below 150 ^s) (Alabaster & Hartley, 1962) on electrofishing efficiency did not affect the present results because the conductivity was always over 150 /js/cm.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Fish Community Structure on the Efficiency of Electrofishing

Zalewski

2008

Aquaculture Research

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Data from small rivers in Poland and Canada show that the accuracy of quantitative electro‐fishing in diverse fish communities is dependent on the size, density, behaviour and body shape of the fish. It is shown that in a non‐homogeneous, riverine fish community a more precise estimate of population size is obtained from a consideration of average weight of specimens, sample composition and quality, than by the use of catch‐effort statistical methods.

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Section: Discussionsupporting

confidence: 70%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Influence of Fish Community Structure on the Efficiency of Electrofishing

Zalewski

2008

Aquaculture Research

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“…Relative abundance, C 1 , seems to be an adequate measure of river fish diversity (Libosvarsky 1966;Zalewski 1983Zalewski , 1985Heimbuch et al 1997;Bravo et al 1999;Meador et al 2003). In an earlier study conducted in a stream, Chmielewski et al (1973) found that the first run efficiency was low for some species, but this could have resulted from the imperfect equipment available at that time.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of electrofishing efficiency in a stream under natural and regulated conditions

Penczak

2008

Aquat. Living Resour.

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-Sampling efficiency (p), estimated from the Zippin depletion model and the percentage of fish obtained during first runs (single-pass electrofishing), which is also named relative abundance (C 1 ), calculated as the ratio of C 1 to estimated density for a site (C e ), were analysed in five contiguous sites in a small lowland stream in Poland over 23 years. The sampled reach was unregulated during the first decade of the study period, but regulated by weirs and sluices in the latter 13 years. The sites were populated with 17 fish species during this period. Sampling efficiency p calculated for all species did not differ significantly between the five sites in any given year, between benthic and non-benthic species, or between the natural and regulated periods. Differences in p were only observed between some species. C 1 differed significantly between large and small species and, except for roach, was not dependent on the number of runs. Results indicate a high stability of both sampling indices in this small stream, despite changes in channel morphology after regulation: information which could be useful for future sampling research in streams.Key words: Lowland stream / Natural / Regulated / Electrofishing efficiency / Relative abundance Résumé -Evaluation de l'efficacité de la pêche électrique en rivière en conditions naturelles et en débit régulé. L'efficacité de l'échantillonnage (p), estimée à partir du modèle de Zippin et le pourcentage de poissons obtenu durant les premiers passages, appelé aussi abondance relative (C 1 ), calculée comme le rapport de C 1 à la densité estimée pour un site (C e ), ont été analysés en cinq sites contigus, dans une petite rivière de plaine, en Pologne, sur une période de 23 ans. Le bief échantillonné était non-régulé durant les dix premières années de l'étude, puis régulé au moyen de barrages et chenaux, les treize années suivantes. Les sites étaient peuplées de 17 espèces de poissons durant cette période. L'efficacité p calculée pour toutes les espèces ne diffère pas entre les cinq sites et quelle que soit l'année, entre espèces benthiques ou non-benthiques, ou entre les périodes de régulation ou non. Des différences de p sont seulement observées entre quelques espèces. C 1 diffère significativement entre grandes et petites espèces, à l'exception du gardon, sans être dépendant du nombre de passages. Les résultats indiquent une grande stabilité des deux indices d'échantillonnage dans cette rivière, en dépit du changement de morphologie du cours d'eau après la régulation : des informations qui peuvent être utiles pour de futurs travaux relatifs à l'échantillonnage des cours d'eau.

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Successive removals with electrical fishing gear — a suitable method for making populations estimates in small streams

Cited by 2 publications

References 4 publications

The Influence of Fish Community Structure on the Efficiency of Electrofishing

The Influence of Fish Community Structure on the Efficiency of Electrofishing

Evaluation of electrofishing efficiency in a stream under natural and regulated conditions

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