Update of pollack abundance indices from professional fishing data (2016-2018)

The ROMELIGO project included a proposal of abundance indicators for pol-89a stock using professional fishing data. The methodolgy is based on the selection of a sample of representative vessels grouped in a cluster with the same technical characteristics, taking into account their LPUE for specifed period and area. The analysis was conducted on an historical dataset from 2005 to 2015. To be able to update it, a conditional decision tree was used to find rules to assign any new vessels to one of the predefined GNS clusters. Then, the trends of LPUE on the overall period were considered: for the past three years, the LPUEs display low levels compared to the whole series while the highest levels were observed between 2011 and 2015. No management measure likely to affect the indicators was identified by professionals. At this time no new element leads to discuss the relevance of this GNS indicator but attention should be paid to its use alone (linked to the possible various uses of the gear).

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Caill-Milly Nathalie, Lissardy Muriel, Bru NOELLE (2020). Update of pollack abundance indices from professional fishing data (2016-2018). Ref. Working Document for the Working Group for the Bay of Biscay and the Iberian Waters Ecoregion (WGBIE). 6 – 13 May 2020, Copenhagen (Denmark). https://archimer.ifremer.fr/doc/00631/74351/

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