Does an industry survey (i.e. a survey conducted by commercial fishing vessels) provide additional information about plaice and sole?
And could this additional information improve the stock assessments of plaice and sole? These are questions that will answer in the "Trajectory Industry Survey". If there appears to be a need for an industry survey, then the survey will be designed and initiated in the final phase of the study.
Will an industry survey be held in the future in the Netherlands? In England, Norway and Iceland, an industry survey has been implemented for a number of years providing input for the annual fish stock assessments. In Norway, for example, 14 commercial ships participate in the survey every year.
In the Netherlands, the ‘Traject bedrijfssurvey’ (Trajectory Industry Survey) is currently taking place to assess the feasibility and need of an industry survey. Last year, the UK-45 fished for three days with research vessels Isis and Tridens. At that time, comparative fishing was shown to be feasible and useful. Therefore, this year (2010) again the UK-45 fished with the research vessels during weeks 32, 36 and 37.
As a result, sufficient data should have been collected for determining whether the size composition of the sole and plaice caught by the UK-45 deviates from that caught by the research vessels. The comparison does not primarily concern how many more fish the UK-45 has caught with its bigger fishing gear and faster fishing speed, but whether the size composition of the catch differs from that of the research vessels. It is possible that a commercial vessel would catch a certain size of plaice and sole that is not being caught by the research vessels. If that is the case, then data from an industry survey could provide important supplementary information for the fish stock assessments.
Phase 1 showed that it was feasible for a commercial fishing vessel and research vessels to fish together. The catches were processed in such a way that it was possible to compare the size composition of sole and plaice. This phase also showed that there was a support base among researchers, fishermen and fishery managers for a commercial survey. » Report: Traject Bedrijfssurvey - Fase 1 draagvlak & haalbaarheid
In Phase 2, the UK-45 again compared the size composition of plaice and sole with the research vessels during 3 weeks of the research survey.
In November 2010, the results will be presented and discussed with interested parties from the fishing industry and others.
Phase 3: After the information day on November 13, it was decided tht Phase 3 will be initiated, and therefore a commercial survey began in 2011. In this industry survey, fishing vessels annually take samples of plaice and sole using standardised methods.
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