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Pulse fishing in Europe

Pulse fishing in Europe. Fishery Overview Sophisticated DC pulse discharge systems Fisheries for flatfish and shrimp ( different stimuli) Dutch, Belgian,

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Page 1: Pulse fishing in Europe. Fishery Overview Sophisticated DC pulse discharge systems Fisheries for flatfish and shrimp ( different stimuli) Dutch, Belgian,

Pulse fishing in Europe

Page 2: Pulse fishing in Europe. Fishery Overview Sophisticated DC pulse discharge systems Fisheries for flatfish and shrimp ( different stimuli) Dutch, Belgian,

Fishery Overview

• Sophisticated DC pulse discharge systems • Fisheries for flatfish and shrimp ( different stimuli)• Dutch, Belgian, German and UK vessels using

systems• Electrical systems replacing beam trawls with heavy

ground gear and tickler chains.• Up to 10% of Dutch fleet ( 80 vessels) may be

derogated in future to use systems. (Predominately flatfish)

• Presently 42 Dutch, 1 Belgian, 5 German, 3 UK licences.

Page 3: Pulse fishing in Europe. Fishery Overview Sophisticated DC pulse discharge systems Fisheries for flatfish and shrimp ( different stimuli) Dutch, Belgian,

WGELECTRA Contributors

• IMARES, & LEI , Netherlands• Thuenen Institute, Germany• ILVO & University of Ghent, Belgium• Marine Laboratory, Scotland

Page 4: Pulse fishing in Europe. Fishery Overview Sophisticated DC pulse discharge systems Fisheries for flatfish and shrimp ( different stimuli) Dutch, Belgian,

Reported work (2014)

• Effects on Sole (adult, egg and larval stages), Plaice, Dab, Cod, Brown Shrimp, Ragworm, Armed Bullhead, Bullrout and enis (Scotland).

• Investigation of impact on benthic invertebrates on going.

• Comparison of catch rates, discards, bycatch etc in traditional and pulse shrimp trawls

• Reduction in by catch by modifying bobbin sizes on shrimp trawls

• Monitor economic performance of pulse fishing vessels

• Initiate survey of stakeholders views on pulse fishing

Page 5: Pulse fishing in Europe. Fishery Overview Sophisticated DC pulse discharge systems Fisheries for flatfish and shrimp ( different stimuli) Dutch, Belgian,

Dutch trawler with tickler chains

Page 6: Pulse fishing in Europe. Fishery Overview Sophisticated DC pulse discharge systems Fisheries for flatfish and shrimp ( different stimuli) Dutch, Belgian,

Sumwing ( contactless) “beam” trawl

Image courtesy of Dr. Daniel StepputtisThuenen Institute, Germany

Page 7: Pulse fishing in Europe. Fishery Overview Sophisticated DC pulse discharge systems Fisheries for flatfish and shrimp ( different stimuli) Dutch, Belgian,

Financial benefits (Energy)

CountryVessel class [hp]

FlatfishFlatfish + shrimps

Shrimps SumTotal by nation

Fuel consumption [M litre/year]

Fuel cost [M €/year]

Fuel saving [M litre/year]

Fuel cost reduction [M €/year]

CO2 reduction [M kg/year]

Netherlands > 300 25 25 30.0 19.5 15.0 9.8 39.0  ≤ 300 13 1 3 17 42 8.9 5.8 3.1 2.0 8.1Germany > 300 3 3 3.6 2.3 1.8 1.2 4.7  ≤ 300 1 0 1 2 5 1.1 0.7 0.4 0.2 1.0United Kingdom > 300 3 3 3.6 2.3 1.8 1.2 4.7  ≤ 300 0 0 0 0 3 0.0 0.0 0.0 0.0 0.0Belgium > 300 0 0 0.0 0.0 0.0 0.0 0.0  ≤ 300 0 0 1 1 1 0.5 0.3 0.2 0.1 0.5Total > 300 31 0 0 31   37.2 24.2 18.6 12.1 48.4  ≤ 300 14 1 5 20 51 10.5 6.8 3.7 2.4 9.6

Totals 47.7 31.0 22.3 14.5 57.9

Variable Value DimensionFuel saving large 50% %Fuel saving small 35% %Fishing weeks large 40 weeksFishing weeks small 35 weekskg CO2 per litre 2.6 kg/litreFuel cons large 30000 litre/weekFuel cons small 15000 litre/weekFuel costs per litre 0.65 €/litre Data courtesy of B. V. Marlen

IMARES, Netherlands

Page 8: Pulse fishing in Europe. Fishery Overview Sophisticated DC pulse discharge systems Fisheries for flatfish and shrimp ( different stimuli) Dutch, Belgian,

Conclusions ( Flatfish trawling)• Lower fuel consumption (40-50%)• Smaller landings (60-80%)• Fewer discards (30-40%)• Higher net earnings (150%)

Conclusions ( Shrimp trawling)• Increased catch rate (23%)• Reduced by catch (9%)• Less flat fish ( 13%)• Less benthic fish (29%)• Less discards (67%)• Reduced bottom pressure (75%)

Page 9: Pulse fishing in Europe. Fishery Overview Sophisticated DC pulse discharge systems Fisheries for flatfish and shrimp ( different stimuli) Dutch, Belgian,

Dutch proposed ensis fishery

• Target species is E. Ensis ( E. Siliqua in Scottish work)• Stimulus 24 volts AC @ 45 amps• Proposed airlift dredge system penetrating 5cm• Tank trials elicited emergence in 40 – 60 seconds• Tow tank trials 90 seconds• Too slow to allow vessel to manoeuver• Future work to elicit faster response: Increasing voltage and

current, partially burying electrodes.