Combining selection models and population structures to inform fisheries management: a case study on hake in the Mediterranean bottom trawl fishery

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Publiée : Jul 1, 2020
DOI : https://doi.org/10.12681/mms.22191
CHRYSSI MYTILINEOU
Faculty of Biology, Department of Zoology-Marine Biology, National and Kapodistrian University of Athens (NKUA), Panepistimioupolis, Ilissia, 15784 Athens, Greece; Faculty of Biology, Department of Zoology-Marine Biology, National and Kapodistrian University of Athens (NKUA), Panepistimioupolis, Ilissia, 15784 Athens, Greece
https://orcid.org/0000-0002-6440-3891
BENT HERRMANN
SINTEF, Fisheries and Aquaculture, Fishing Gear Technology, Willemoesvej 2, 9850 Hirtshals, DeSINTEFnmark; University of TromsØ, Norway
STEFANOS KAVADAS
Hellenic Centre for Marine Research (HCMR), Institute of Marine Biological Resources & Inland Waters (IMBRIW), P.O. Box 712, Anavyssos 19013, Attica, Greece
CHRIS J. SMITH
Hellenic Centre for Marine Research (HCMR), Institute of Marine Biological Resources & Inland Waters (IMBRIW), P.O. Box 712, Anavyssos 19013, Attica, Greece
PERSEFONI MEGALOFONOU
Faculty of Biology, Department of Zoology-Marine Biology, National and Kapodistrian University of Athens (NKUA), Panepistimioupolis, Ilissia, 15784 Athens, Greece
Résumé

The reduction of juvenile catch and discards are important targets in fisheries policy. This work examines how selection models can predict the size structure (LFD) of discards and landings considering the effects of area, time period, gear and fisher behaviour. Additional exploitation indicators related to the gear used, fisher's selection pattern, and discards were also estimated. The approach is demonstrated in a study concerning hake in the Mediterranean trawl fishery, focusing on high (HRA) and low (LRA) recruitment areas in the Saronikos Gulf (Eastern Mediterranean) during two periods (June, September) using two codends (40 mm square-40S, 50 mm diamond-50D mesh). The predicted discards LFDs revealed generally higher percentages in the HRA in June when using the 50D. The predicted landings LFDs showed higher percentages in the LRA in September for both codends, but undersized hake were always included. LFDs and exploitation indicators indicated that both codends were inappropriate for sustainable fishing of hake in the HRA, where 50D performed worse than the 40S. Fishing with both codends in the LRA in September revealed the lowest discards rates and minimum sizes of landings close to MCRS (minimum conservation reference size). These results can provide information to fisheries management aiming to protect juveniles and reduce discards through spatio-temporal fishing closures.

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