Catch selectivity by electrical fishing systems

Stewart, Peter A.

doi:10.1093/icesjms/36.2.106

Cited by 22 publications

(19 citation statements)

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“…In order to decrease the length selectivity, the current line density could be increased (Stewart, 1975). However, this would also increase the mortality of the fish.…”

Section: Biological Factorsmentioning

confidence: 99%

Electrofishing — Theory and practice with special emphasis on salmonids

et al. 1989

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This report attempts to establish guide-lines for electrofishing in population studies and is the result of literature studies and experience from electrofishing in Denmark, Finland, Norway and Sweden. Equipment, safety and training, sampling design and precision requirements for various types of investigations, population estimation and fishing practice are discussed. The results are put forward in the form of recommendations.Special attention is paid to the sampling design of surveys in streams of different types and for different purposes. Examples of the computation procedures are also included.

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“…In order to decrease the length selectivity, the current line density could be increased (Stewart, 1975). However, this would also increase the mortality of the fish.…”

Section: Biological Factorsmentioning

confidence: 99%

Electrofishing — Theory and practice with special emphasis on salmonids

et al. 1989

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“…The main objective of the work usually was to reduce fuel consumption and to increase the commercial catches with no or very little attention to by-catches. Some experiments, however, already pointed at possibilities for selective fishing with electricity (Stewart, 1975). Research on electric fishing continued into the 1980s but then stopped almost simultaneously in all North Sea countries.…”

Section: Introductionmentioning

confidence: 99%

On electrical fishing for brown shrimp (Crangon crangon)

Polet¹,

Delanghe²,

Verschoore

2005

Fisheries Research

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“…Several authors (Libosvarsky, 1966;Stewart, 1975;Mahon, 1980;Zalewski, 1986) have demonstrated that electro-fishing is size-selective i.e. the larger the fish, the higher the capture probability in the first or earlier captures.…”

Section: Discussionmentioning

confidence: 99%

Effects of eel (Anguilla anguilla L.) removals from selected sites of a stream on its subsequent densities

1990

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We assessed the effect of eel (Anguilla anguilla) removal from three sites of a Cantabrian stream upon its subsequent densities. In the first sample (Sept. 1986) numbers and densities were estimated as 43, 45 and 84 ind and 3490,3030 and 3750 ind ha-'. Removal of these eels reduced the subsequent numbers and densities which, except on two occasions, were never reached again during the two years (eleven estimates) of study. Highest densities were recorded in the uppermost site in May and July, 1987, coincident with a strong drought and the lowest densities occurred in 1988 during a normal wet year. We hypothesize first that, because of a selective underground homing behaviour of eels, electro-fishing is inefficient and results in underestimates of the population. Second, seasonal variations of water discharge and droughts may not influence the homing behaviour of 'eels until a threshold of dryness is reached. If this occurs, eels abandon their refuges and move towards the stream bottom. It seems that in Arroyo Chabatchos this threshold was exceeded in the summer of 1987 when the highest densities were estimated. The re-colonization of these sites experimentally depleted of eels, is a slow procces that lasts for, at least, two years.

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Catch selectivity by electrical fishing systems

Cited by 22 publications

References 0 publications

Electrofishing — Theory and practice with special emphasis on salmonids

Electrofishing — Theory and practice with special emphasis on salmonids

On electrical fishing for brown shrimp (Crangon crangon)

Effects of eel (Anguilla anguilla L.) removals from selected sites of a stream on its subsequent densities

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