Effects of fishing gear on quality – The SEAQUID-EFF project

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Effects of fishing gear on quality – The SEAQUID-EFF project. Daphné Deloof Karen Bekaert, Johan Robbens. 01/10/2013 Fishing gear and effective catch handling workshop 2013. Institute for Agricultural and Fisheries Research Animal Sciences Unit www.ilvo.vlaanderen.be - PowerPoint PPT Presentation

Transcript of Effects of fishing gear on quality – The SEAQUID-EFF project

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Effects of fishing gear on quality The SEAQUID-EFF project01/10/2013 Fishing gear and effective catch handling workshop 2013Daphn DeloofKaren Bekaert, Johan Robbens Institute for Agricultural and Fisheries ResearchAnimal Sciences Unitwww.ilvo.vlaanderen.beAgriculture and Fisheries Policy Area

voorblad1Aim of the study2 To compare the beam trawl, otter trawl and gillnets and entangling nets trawl in terms of quality of whiting and sole

Sequid technology: objective alternative for QIM?

Aim of the study3 Convincing the ship owners and their national association to turn away from the beam trawl in order to switch to an alternative methods

Improving the image and sustainability of the Belgian fleet, dominated by beam trawlers

Materials and methods42011 : data collection on commercial ships (spring;summer;autumn/winter)

Analysis on board of commercial ships:Initial muscle pHOnset of rigor mortisExternal damages Injury Index Method (IIM)Mortality rate

Analysis in the lab by shelf life study:QIMTVB-N

pH and rigor mortis in sole5pHRigor mortis

gill & ent. otter trawl beam trawl

Otter BeamGill & entpH and rigor mortis in whiting6pHRigor mortis

gill & ent. otter trawl beam trawl

Otter BeamGill & entInjuries 7

gill & ent. otter trawl beam trawlsole

gill & ent. otter trawl beam trawlwhitingMortality 8solewhitingOtter trawl9%7%Beam trawl60%

100%Gill & ent.nets15%100%TVB-N and QIM (shelf life studies)9TVB-N and QIM (shelf life studies)10Conclusions11 Sole : Gill& ent.nets trawling is less stressful than beam and otter trawling Less injuries with gill& ent.nets trawl, followed by beam trawl Few mortality with otter trawl and gill & ent. nets trawl Shelf lifebeam trawl < shelf lifeotter trawl < shelf lifegill&ent.nets

Whiting : Gill& ent.nets trawling is less stressful Significant more injuries with otter trawl Few mortality with otter trawl Shelf life: no significant difference between beam & otter trawl

Changing trawling methods promotes better quality and contributes to more sustainable fisheriesSequid device: principle12

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Objective alternative for QIM? (fish auction/ evaluation of catching methods in terms of fish quality) Tested species: sole and plaice Technology: dilectric spectroscopy TDR-measurements

Sequid device: principle13

Sequid device : TDR measurement => Statistical PCA analysis Fourier transformation Sequid device: results14Measurements

RMSE (sole)MeasurementsRMSE (plaice) Dark skin side2.3 days Dark skin side2.1 daysWhite skin side2.1 daysWhite skin side1.7 daysDeskinned1.5 daysDeskinned-Fillets1.4 daysFillets1.6 days

Sequid device: conclusions15 R: 70% 82% RMSE with skin > RMSE deskinned

RMSE dark skin > RMSE white skin> RMSE fillet Experiments: tagged samples => reality = more complex!

Need for optimization of hard- and software for sequid device