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Bycatch of crustacean and fish bottom trawl fisheries from southern Portugal (Algarve)
Costa, M.E.; Erzini, K.; Borges, T.C. (2008). Bycatch of crustacean and fish bottom trawl fisheries from southern Portugal (Algarve). Sci. Mar. (Barc.) 72(4): 801-814. dx.doi.org/10.3989/scimar.2008.72n4801
In: Scientia Marina (Barcelona). Consejo Superior de Investigaciones Científicas. Institut de Ciènces del Mar: Barcelona. ISSN 0214-8358, more
Peer reviewed article  

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Keywords
    By catch; Crustaceans; Fish; Trawling; ANE, Portugal, Algarve [Marine Regions]; Marine

Authors  Top 
  • Costa, M.E.
  • Erzini, K.
  • Borges, T.C.

Abstract
    As part of two research projects for analysing bycatch and discards, we quantified catch composition, catch rates. bycatch and discards in two important commercial bottom trawl fisheries (crustacean and fish trawls) off the southern coast of Portugal (Algarve). Stratified sampling by onboard observers took place from February 1999 to March 2001 and data were collectcd from 165 tows during 52 fishing trips. Commercial target species included crustaceans: blue and red shrimp (Aristeus antennatus), deep-water rose shrimp (Parapenaeus longirostris), Norway lobster (Nephrops norvegicus); and fishes: seabreams (Diplodus spp. and Pagellus spp.), horse mackerels (Trachurus spp.) and European hake (Merluccius merlaccius). The trawl fisheries are characterised by considerable amounts of bycatch: 59.5% and 80.4% of the overall total catch for crustacean and fish trawlers respectively. A total of 255 species were identified, which belonged to 15 classes of organisms (137 vertebrates, 112 invertebrates and 6 algae). Crustacean trawlers had higher bycatch biodiversity. Bony fish (45.6% and 37.8%) followed by crustaceans (14.6% and 11.5%) were the dominant bycatch components of both crustacean and fish trawlers respectively. The influence of a number of factors (e.g. depth, fishing gear, tow duration and season) on bycatch and discards is discussed.

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