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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

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On electrical fishing for brown shrimp (Crangon crangon): I. Laboratory experiments Polet, H.; Delanghe, F.; Verschoore, R. (2005). On electrical fishing for brown shrimp (Crangon crangon): I. Laboratory experiments. Fish. Res. 72(1): 1-12. dx.doi.org/10.1016/j.fishres.2004.10.016 In: Fisheries Research. Elsevier: Amsterdam. ISSN 0165-7836; e-ISSN 1872-6763, meer

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Beschikbaar in	Auteurs
VLIZ: Open Marine Archive 238948 [ download pdf ]

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Trefwoorden

Beam trawls (bottom) By catch Catching methods > Electric fishing Electric pulses Fisheries > Shellfish fisheries > Crustacean fisheries > Shrimp fisheries Gear selectivity Mortality causes Nets > Fishing gear > Fishing nets > Trawl nets Survival Crangon crangon (Linnaeus, 1758) [WoRMS]; Crangon crangon (Linnaeus, 1758) [WoRMS] ANE, Noordzee [Marine Regions] Marien/Kust

Author keywords

brown shrimp; beam trawl; North Sea; discard reduction; electric pulses

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Auteurs		Top
Polet, H., meer Delanghe, F., meer Verschoore, R.

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Abstract

The fishery for brown shrimp (Crangon crangon) in the North Sea is carried out by more than 600 vessels with total annual brown shrimp landings of around 20,000 t. Due to the small mesh size used, the catches also contain large amounts of unwanted by-catch. To find ways of reducing this by-catch, experiments were carried out with electric pulses. The basic idea was to selectively invoke a startle response with shrimp without stimulating any by-catch species. A selective groundrope could then be used in combination with electric pulses to obtain catch separation. As a preparation for sea trials, laboratory experiments were carried out. The pulse generators were tested for their basic characteristics. Experiments were carried out with fish and invertebrate species that are frequently caught in the brown shrimp fishery. The effect of pulse amplitude and frequency in relation to ambient parameters on the response of these animals was tested. To assess the effect of the pulses on these animals, survival experiments were carried out. The main conclusion was that shrimps react strongly to the pulses and most of the other species regularly caught in shrimp trawls do not, so selective electro-fishing has potential. The survival tests indicated that the pulses have no effect on the survival and general behaviour of the animals that have been in the electric field.

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