On electrical fishing for brown shrimp (Crangon crangon)

Polet, Hans; Delanghe, Fernand; Verschoore, Reinhart

doi:10.1016/j.fishres.2004.10.016

Cited by 35 publications

(28 citation statements)

References 7 publications

(6 reference statements)

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“…However, no significant differences were found between the SOLE and MECH groups, indicating that an increased negative impact of the electrical stimuli is unlikely. Indeed, no adverse effects from the exposure of brown shrimp to a startle pulse have been observed in the present or previous studies (Polet et al 2005a;Soetaert et al 2014). Because the use of this stimulus enables electrotrawls targeting brown shrimp to reduce their bycatch rates of juvenile small shrimp , their impact on brown shrimp stocks will most likely be smaller than that of conventional beam trawls if landings are not increased.…”

Section: Survivalsupporting

confidence: 43%

“…This variability in field strength, inherent in a setup with wireshaped electrodes, was reflected in the less pronounced cramp reaction of the animals situated at the corners of the tanks. This observation suggests that the electrical field of commercial electrotrawls decreases rapidly beyond the trawl and that no effective stimulation outside the trawl path is to be expected (Polet et al 2005a;De Haan et al 2011). Although the intensity of the single electrical exposures experienced by the animals was variable, the total impact on the population of shrimp in the tank was averaged across a large number of exposures and animals as well as the random redistributions of the shrimp during their escape responses after every exposure.…”

Section: Survivalmentioning

confidence: 99%

“…A minority of the electrotrawls target brown shrimp by producing a unipolar startle pulse of 5 Hz. This pulse induces five contractions of the brown shrimp's abdomen per second, each time resulting in a tail flip (Polet et al 2005a). As a consequence, the brown shrimp jump out of the sediment into the water column, while small flatfish, most other benthos, and debris are not stimulated and remain on or close to the seafloor (Polet et al 2005b).…”

mentioning

confidence: 99%

“…This pulse induces five contractions of the brown shrimp's abdomen per second, each time resulting in a tail flip (Polet et al 2005a). As a consequence, the brown shrimp jump out of the sediment into the water column, while small flatfish, most other benthos, and debris are not stimulated and remain on or close to the seafloor (Polet et al 2005b). This allows fishermen to use a straight bobbin rope with 10-12 (instead of 36) bobbins and a higher footrope, which can reduce bycatch volumes up to 75% .…”

mentioning

confidence: 99%

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Laboratory Study of the Impact of Repetitive Electrical and Mechanical Stimulation on Brown Shrimp Crangon crangon

Soetaert

Verschueren²,

Chiers

et al. 2016

Mar Coast Fish

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Pulse trawling is currently the best available alternative to beam trawling in the brown shrimp Crangon crangon and Sole Solea solea (also known as Solea vulgaris) fisheries. To evaluate the effect of repetitive exposure to electrical fields, brown shrimp were exposed to the commercial electrodes and pulse settings used to catch brown shrimp (shrimp startle pulse) or Sole (Sole cramp pulse) 20 times in 4 d and monitored for up to 14 d after the first exposure. Survival, egg loss, molting, and the degree of intranuclear bacilliform virus (IBV) infection were evaluated and compared with those in stressed but not electrically exposed (procedural control) and nonstressed, nonexposed (control) brown shrimp as well as brown shrimp exposed to mechanical stimuli. The lowest survival at 14 d (57.3%) occurred in the Sole cramp pulse treatment, and this was significantly lower than in the group with the highest survival, the procedural control (70.3%). No effect of electrical stimulation on the severity of IBV infection was found. The lowest percentage of molts occurred in the repetitive mechanical stimulation treatment (14.0%), and this was significantly lower than in the group with the highest percentage of molts, the procedural control (21.7%). Additionally, the mechanically stimulated brown shrimp that died during the experiment had a significantly larger size than the surviving individuals. Finally, no effect of the shrimp startle pulse was found. Therefore, it can be concluded that repetitive exposure to a cramp stimulus and mechanical stimulation may have negative effects on the growth and/or survival of brown shrimp. However, there is no evidence that electrical stimulation during electrotrawls would have a larger negative impact on brown shrimp stocks than mechanical stimulation during conventional beam trawling.Received November 15, 2015; accepted May 16, 2016

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Section: Survivalsupporting

confidence: 43%

Section: Survivalmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Laboratory Study of the Impact of Repetitive Electrical and Mechanical Stimulation on Brown Shrimp Crangon crangon

Soetaert

Verschueren²,

Chiers

et al. 2016

Mar Coast Fish

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“…Electrical sensitivity in invertebrates has been suggested by two types of research: stimulation of animals with higher voltages than we know animals or environments to produce [shrimp (Kessler, 1965;Poleta et al, 2005); C. elegans (Sukul and Croll, 1978;Gabel et al, 2007); cockroach (Newland et al, 2008)] and the use of lowlevel voltages to simulate biological events or relationships (Patullo and Macmillan, 2007;Steullet et al, 2007). The responses to high voltages offer little for the interpretation of a specialist sense that detects naturally occurring electrical signals because they cause involuntary or abnormal behaviour, e.g.…”

Section: Discussionmentioning

confidence: 99%

Making sense of electrical sense in crayfish

Patullo

Macmillan

2010

Journal of Experimental Biology

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SUMMARYThe five sensory modalities of humans are also found in a wide range of invertebrates. Other vertebrates have evolved additional special senses, such as the magnetic sense, which are also found in some invertebrates. However, there remain a few sensory abilities that curiously appear to be found in either vertebrates or invertebrates, but not both. For example, electrosensitivity -the ability to detect electric fields in water -which should benefit vertebrates and invertebrates alike, is apparently only used by vertebrates. However, recent reports suggest that some invertebrates could have an electric sense. Here we examine that possibility further and demonstrate a behavioural threshold to low-level electrical fields in two freshwater invertebrates. The responses are not low enough for them to detect the Earth's magnetic field as some other electroreceptive species can do, but sufficiently low for them to use in navigation or prey and predator detection. This finding challenges the current view of the sensory world of aquatic invertebrates and has implications for the evolution of this ability.

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Pulse Trawling: The Impact of Pulsed Direct Current on Early Life Stages of Sole Solea solea

Desender

Dumolein

Duchateau

et al. 2018

N American J Fish Manag

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Despite electric pulse fishing being regarded as a promising environmentally friendly fishing method, very little is known about possible negative effects on early life stages of bottom‐dwelling species such as Sole Solea solea. Electrotrawling for brown shrimp Crangon crangon is increasingly used in shallow coastal zones and estuaries of the southern North Sea. As these fishing grounds are often important nurseries and spawning areas for various marine species, electrotrawling could therefore harm inhabiting fishes during their early life stages. Hence, this research aims to investigate the effect of electric pulses used to catch brown shrimp on the survival and development of Sole embryos and larvae. Exposure of Sole embryos at 2 d postfertilization and larvae at 11 d posthatching to pulsed DC used to catch brown shrimp did not result in a lower survival 8 d after exposure. Additionally, no differences in yolk sac resorption and morphometric length measurements of the notochord, muscle, eye, and head were observed in the developing larvae.

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On electrical fishing for brown shrimp (Crangon crangon)

Cited by 35 publications

References 7 publications

Laboratory Study of the Impact of Repetitive Electrical and Mechanical Stimulation on Brown Shrimp Crangon crangon

Laboratory Study of the Impact of Repetitive Electrical and Mechanical Stimulation on Brown Shrimp Crangon crangon

Making sense of electrical sense in crayfish

Pulse Trawling: The Impact of Pulsed Direct Current on Early Life Stages of Sole Solea solea

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