Effects on invertebrates
Pulse effects on various benthic invertebrates
Smaal and Brummelhuis (2005) exposed a variety of benthic invertebrates to a Delmeco sole pulse for 10 seconds. Some species showed a response to the electrical stimulus by closing their shells (bivalves), withdrawing themselves in their shell (whelk, hermit crab) or showing a tail flip response (decapod shrimps), while other species (polychaetes, Echinodermata) did not show a visible response. The experiments did not suggest that electrical stimulation affected the filtration rate of bivalves or the mortality as compared to the control group. Because the details of the pulse characteristics were not enclosed in the dataset, the results are only indicative for the possible effects.
Pulse effects on shrimps and ragworms
To detect the safe range of pulse parameters, Soetaert et al. (2014) exposed brown shrimps and ragworms to a homogeneous electric field for up to 5 seconds and studied their behaviour, 14-d mortality rate, gross and histology. Pulse setting included the commercially applied frequency and field strengths. No adverse effects were detected except for an increase in a virus infection (IBV) in the hepatopancreas in shrimps exposed to the maximum field strength (200 V/m).
In a follow up experiment studying the effects of repetitive exposure in shrimps, however, this result could not be corroborated. In this experiment, brown shrimps were exposed 20 times during 4 days to either the sole pulse or the shrimp pulse. The survival, egg loss, moulting and the degree of IBV infection was compared shrimps exposed to electrical pulses, shrimps exposed to mechanical disturbance mimicking the conventional shrimp trawling and a control group. The sole pulse treatment gave a significant lower 14-day survival as compared to the control group, while moulting was reduced by mechanical disturbance.
Laboratory Study of the Impact of Repetitive Electrical and Mechanical Stimulation on Brown Shrimp Crangon crangon
Research article published in Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science 8:404–411, 2016. Authors: ...
Determining the safety range of electrical pulses for two benthic invertebrates: brown shrimp and ragworm
Research article published in ICES Journal of Marine Science. Authors:Maarten Soetaert, Koen Chiers, Luc Duchateau, Hans Polet, ...
Presentatie - Effecten Elektrische Pulsen
Presentatie 'Effecten Elektrische Pulsen' door Maarten Soetaert, Hans Polet, Bart Verschueren Annemie Decostere, Koen Chiers ...
Presentatie - Evaluatie van de impact van de elektrische garnaalvisserij op een selectie mariene vis en invertebraten uit de Noordzee
Presentatie 'Evaluatie van de impact van de elektrische garnaalvisserij op een selectie mariene vis en invertebraten uit de ...
Presentatie - Evaluatie van een seizoen pulsvisserij op garnaal met HA 31
Presentatie 'Evaluatie van een seizoen pulsvisserij op garnaal met HA 31' door Bart Verschueren tijdens de thema-ochtend ...