Electric pulse fishing

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The pulse trawl: electrodes in the tow direction of the gear cause an electric field above the seabed, which stimulate the flatfish so that come up and end up in the net

Electric pulse fishing is a fishing technique sometimes used in trawl fisheries which produces a limited electric field above the seabed to catch fish.[1] The pulse trawl gear consists of a number of electrodes, attached to the gear in the tow direction, that emit short electric pulses. The electrodes replace the tickler chains that are used in traditional beam trawl fishery. The pulse trawl fishery is mainly aimed at flatfish like sole, with by-catch plaice. In addition, the pulse trawl gear is applied in shrimp fisheries on a limited scale. Technically, the use of electricity to catch fish is prohibited in European waters. However, the European Union is able to provide exemptions to this rule since 2007. These exemptions are now mainly used by Dutch and British[2] trawlers in the North Sea.

Electric pulse fishing should not be confused with pulse fishing, which is a fisheries management technique for preventing fish stocks from being overfished by periodically permitting a cycle of fishing followed by a fallow period which allows stocks to reconstitute.[3]

Background

Electric pulse fishing is applied on a limited scale for catching flatfish. In this branch of demersal fishery different techniques can be used for disturbing fish on the seabed and sending them up into the belly of the net. In conventional bottom trawling the trawl doors and foot rope, which consists of steel chains mounted to the bottom of the net opening, disturb the seabed, causing the demersal fish to swim along in the mouth of the net until they succumb and fall into cod end. Electric pulse fishing gear does not involve these chains, but features cables with electrodes consisting of isolated and conductive elements mounted in the dragging direction. A short-lasting electric field is generated to disturb demersal fish without killing or paralysing them, but rather by causing a involuntary muscular contraction.

Electric pulse fishing consumes less energy compared to conventional trawling, due to the lighter trawl, lower fishing speed and lower frictive resistance from the seabed[4]. It therefore requires significantly less fuel, which reduces carbon dioxide emissions and makes it an economically interesting alternative. As there is no "ploughing effect", this method of fishing has a less disastrous impact on the seabed ecosystem[5] [6]. It also involves fewer discards for all species categories that are discarded [4].

Animal rights

In January 2018, the European Parliament approved a call to ban electric pulse fishing, seen by some as cruel.[7]

See also

References

  1. ^ Renders E, Decostere A, Polet H, Vincx M and Verschueren B (2011) "Assessment of electric pulse fishing as an environment friendly fishing method in the North Sea"
  2. ^ Monbiot G "We should be outraged by Europe slaughtering sea life in the name of 'science'", 9 Feb 2015
  3. ^ Da Rocha JM, Gutiérrez MJ and Antelo LT (2013) "Selectivity, pulse fishing and endogenous lifespan in Beverton-Holt models" Environmental and Resource Economics, 54 (1): 139–154.
  4. ^ a b Quirijns, F.J., Strietman, W.J., Marlen, B. van, Rasenberg, M., 2013. Platvis pulsvisserij, Resultaten onderzoek en kennisleemtes. IMARES rapport C193/13.
  5. ^ Van Marlen, B., de Haan, D., van Gool, A.C.M., Burggraaf, D. (2009). The effect of pulse stimulation on marine biota - Research in relation to ICES advice - Progress report on the effects on benthic in-vertebrates. IMARES report C103/09
  6. ^ Van Marlen, B., Bergman, M.J.N., Groenewold, S., Fonds, M. (2001). Research on diminishing impact in demersal trawling – The experiments in The Netherlands. ICES CM2001/R:09
  7. ^ "EU Parliament Calls for Ban on Electric Pulse Fishing". U.S. News & World Report. AP. Retrieved 16 January 2018.

External links

  • Pulse trawling British Sea Fishing. Retrieved 24 September 2014.
  • Pulse fishing dossier Wageningen University and Research. Retrieved 15 January 2018.
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