Narrowing down the number of species requiring detailed study as candidates for the EU Common Fisheries Policy discard ban

Type Article
Date 2017-03
Language English
Author(s) Morfin MarieORCID1, Mehault SoniaORCID1, Benoit Hugues P.2, Kopp DorotheeORCID1
Affiliation(s) 1 : IFREMER, Unite Sci & Technol Halieut, Lab Technol & Biol Halieut, 8 Rue Francois Toullec, F-56325 Lorient, France.
2 : Fisheries & Oceans Canada, Gulf Fisheries Ctr, Moncton, NB E1C 9B6, Canada.
Source Marine Policy (0308-597X) (Elsevier Sci Ltd), 2017-03 , Vol. 77 , P. 23-29
DOI 10.1016/j.marpol.2016.12.003
WOS© Times Cited 19
Keyword(s) Landing obligation, Discard mortality, Hypoxia, Artisanal bottom trawl fishery, Bay of Biscay, English Channel
Abstract By 2019, the Common Fisheries Policy will prohibit discarding in all European fisheries of any pelagic, demersal or shellfish species for which removals are managed by TACs and quotas or minimum sizes. However, the regulation allows for exemptions from the prohibition for species for which scientific evidence demonstrates high survival rates associated with discarding. Producing reliable evidence of high survival typically requires long and costly studies involving tagging or captivity. This paper proposes to use the capacity to resist air exposure, a key stressor for discarded animals, as a proxy for survival that can be used to prioritize candidate species for more in-depth discard survival studies. The time required to induce mortality (TM) in air-exposed fish was estimated for ten discarded species under commercial fishing conditions for two artisanal French otter trawlers in the Bay of Biscay and in the English Channel. European seabass, plaice, sole and skates had extended TM values on average, suggesting that these species are good candidates. The three species observed in both regions (plaice, sole and skates) had larger TM values in the English Channel experiment compared to the Bay of Biscay experiment. Among the four measured external conditions that could influence TM (air temperature, fish length, tow depth and tow duration), the air temperature was the most important and the factor that most distinguished the two experiments.
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