A methodology based on data filtering to identify reference fleets to account for the abundance of fish species: Application to the Striped red mullet (Mullus surmulletus) in the Bay of Biscay

Type Article
Date 2019-07
Language English
Author(s) Caill-Milly NathalieORCID1, Lissardy MurielORCID1, Bru Noëlle2, Dutertre Marie-Adèle3, Saguet Cassandre1
Affiliation(s) 1 : Ifremer - Laboratory Environment Resources of Arcachon/Anglet (France), Ifremer - Laboratory Environment Resources of Arcachon/Anglet (France), 1 Allée du Parc Montaury, 64600, Anglet, France
2 : CNRS / University of Pau & Pays de l'Adour/ E2S UPPA, Laboratory of Mathematics and its Applications of Pau – MIRA, UMR5142, 1 Allée du Parc Montaury, 64600, Anglet, France
3 : University of Pau & Pays de l'Adour - STEE College - Montaury Campus, 1 Allée du Parc Montaury, 64600, Anglet, France
Source Continental Shelf Research (0278-4343) (Elsevier BV), 2019-07 , Vol. 183 , P. 51-72
DOI 10.1016/j.csr.2019.06.004
Keyword(s) Data-limited stock, Commercial data, Discards, LPUE, Professional knowledge, Data filtering
Abstract

For data-limited stocks (DLS), professional fishing data can be used as a potential source of information, especially in the absence of appropriate scientific survey, to understand abundance evolution under realistic hypothesis on resource catchability. This work focuses on a data-filtering approach, the selected fishing effort must reflect vessel activity that is least dependent on their technical characteristics and as stable as possible over time. The variable of interest is landing by fishing sequence (landing for a given gear, gear mesh, day and ICES statistical rectangle) called LPUE. In order to account for the abundance of the species, it was necessary to consider the discards. The method thus proceeds in 4 steps: (i) focus on LPUE variability and causes' prioritization; (ii) cluster definition to obtain a typology of vessels; (iii) average LPUE per cluster analysis; (iv) consideration of gear mesh classes and seasonal variations (quarters). This approach is outlined for the Striped red mullet of the Bay of Biscay that is currently in DLS category 5. Two reference fleets are thereby proposed: firstly the otter trawlers composed of small vessels (7.9–15.8 m) with a gauge of 2–43.9 grt, an engine power between 44 and 256 kW and a gear mesh of 70–79 mm; secondly the set gillnetters, which are defined by medium-sized vessels (8.2–14.8 m, 2–30.2 grt, 70–331 kW) whose gear mesh is either 50–59 mm (2nd and 3rd quarters), 60–69 mm (2nd quarter) or greater than 90 mm (2nd quarter). LPUEs of these fleets show a downward trend, significant in two out of four cases which may reflect a deterioration of the status of the Striped red mullet stock.

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Caill-Milly Nathalie, Lissardy Muriel, Bru Noëlle, Dutertre Marie-Adèle, Saguet Cassandre (2019). A methodology based on data filtering to identify reference fleets to account for the abundance of fish species: Application to the Striped red mullet (Mullus surmulletus) in the Bay of Biscay. Continental Shelf Research, 183, 51-72. Publisher's official version : https://doi.org/10.1016/j.csr.2019.06.004 , Open Access version : https://archimer.ifremer.fr/doc/00503/61495/