Exploring habitat credits to manage the benthic impact in a mixed fishery

Type Article
Date 2018-01
Language English
Author(s) Batsleer J.1, 2, Marchal PaulORCID3, Vaz SandrineORCID4, Vermard YouenORCID5, Rijnsdorp A. D.1, 2, Poos J. J.1
Affiliation(s) 1 : Wageningen Marine Res, POB 68, NL-1970 AB Ijmuiden, Netherlands.
2 : Wageningen Univ, Aquaculture & Fisheries Grp, POB 338, NL-6700 AH Wageningen, Netherlands.
3 : IFREMER, Channel & North Sea Fisheries Res Unit, 150 Quai Gambetta,BP 699, F-62321 Boulogne, France.
4 : IFREMER, UMR MARBEC, Av Jean Monnet,BP 171, F-34200 Sete, France.
5 : IFREMER, Ctr Atlantique, Rue Ile dYeu,BP 21105, F-44311 Nantes, France.
Source Marine Ecology Progress Series (0171-8630) (Inter-research), 2018-01 , Vol. 586 , P. 167-179
DOI 10.3354/meps12392
WOS© Times Cited 1
Keyword(s) Fleet dynamics, Dynamic state variable modelling, TAC, Total allowable catch, Mixed fisheries, Eastern English Channel, Plaice, Cod
Abstract

The performance of a combined catch quota and habitat credit system was explored to manage the sustainable exploitation of a mix of demersal fish species and reduce the benthic impacts of bottom trawl fisheries using a dynamic state variable model approach. The model was parameterised for the Eastern English Channel demersal mixed fishery using otter trawls or dredges. Target species differed in their association with habitat types. Restricting catch quota for plaice and cod had a limited effect on benthic impact, except when reduced to very low values, forcing the vessels to stay in port. Quota management had a minimal influence on fishing behaviour and hence resulted in a minimal reduction of benthic impact. Habitat credits may reduce the benthic impacts of the trawl fisheries at a minimal loss of landings and revenue, as vessels are still able to reallocate their effort to less vulnerable fishing grounds, while allowing the fishery to catch their catch quota and maintain their revenue. Only if they are reduced to extremely low levels can habitat credits potentially constrain fishing activities to levels that prevent the fisheries from using up the catch quota for the target species.

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