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Quantifying causes of discard variability: an indispensable assistance to discard estimation and a paramount need for policy measures Depestele, J.; Vandemaele, S.; Vanhee, W.; Polet, H.; Torreele, E.; Leirs, H.; Vincx, M. (2011). Quantifying causes of discard variability: an indispensable assistance to discard estimation and a paramount need for policy measures. ICES J. Mar. Sci./J. Cons. int. Explor. Mer 68(8): 1719-1725. dx.doi.org/10.1093/icesjms/fsr030 In: ICES Journal of Marine Science. Academic Press: London. ISSN 1054-3139; e-ISSN 1095-9289

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Beschikbaar in	Auteurs
VLIZ: Open access 220961 [ download pdf ]

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Trefwoorden

ANE, North Sea Beam trawlers Legislation > Fishery regulations > Quota regulations Management > Resource management > Fishery management Market prices ANE, Noordzee [Marine Regions] Marien/Kust

Author keywords

beam trawl; discards; fishery management; highgrading; market price; minimum landing size; North Sea; quota

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Auteurs		Top
Depestele, J. Vandemaele, S. Vanhee, W. Polet, H.	Torreele, E. Leirs, H. Vincx, M.

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Abstract

Fishery-dependent data underpin the scientific advice given to fishery managers. However, discard estimates are often imprecise as a result of limited sampling coverage. Estimating discard rates from length frequency distributions (LFDs) in commercial catches may complement information from observer trips. The accuracy of estimates depends greatly on careful investigation of the discard variability. Here, the impact of three essential factors was quantified for beam-trawl fisheries in the southern North Sea: (i) market prices, (ii) landings per trip (LPT) limitations, and (iii) selectivity of the commercial fishing gear. Observed discard rates for cod, plaice, sole, and whiting were compared with estimates based on length frequency data, taking account of the variability attributable to LPT limitations and market price. Observed discard estimates of cod and whiting differed significantly from LFD-derived estimates because of highgrading. The results indicate that LFD-derived discard estimates are only reliable if the crucial driving factors are quantified. LFDs can be collected from research vessels or by fishers in partnership with scientists. Based upon many of these LFDs and the discard-variability factors identified in observer programmes, discard rates can be estimated better.

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