Catch composition and discard of the boat seine in the Istanbul Strait (Turkey)

Uzer U., Yildiz T., Karakulak F. S.

TURKISH JOURNAL OF ZOOLOGY, vol.41, no.4, pp.702-713, 2017 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 41 Issue: 4
  • Publication Date: 2017
  • Doi Number: 10.3906/zoo-1610-10
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
  • Page Numbers: pp.702-713
  • Keywords: Boat seine, discard, bycatch, Istanbul Strait, Sea of Marmara, BEACH-SEINE, BY-CATCH, FISHERIES, FISH, COAST, SELECTIVITY, BYCATCH
  • Istanbul University Affiliated: Yes


This study attempted to determine certain characteristics of the species caught in the boat seine fishery in the Istanbul Strait during the 2009-2010 fishing season, including catch composition, commercial and nontarget catch ratios, catch per unit effort (CPUE), and the length distributions of commercial species. A survey of 20 boat seine operations detected species belonging to the following 3 different taxonomic groups: 26 Osteichthyes, 2 Crustacea, and 1 Mollusca. Of all of the nontarget species, 13 were commercial, 14 were noncommercial, and only 1 was under threat. Of the total catch, the proportion of the commercial species in the nontarget catch was 31.3%, and that of the discarded catch, which the fishermen did not take into account, was 2.8%. According to the Spearman rank correlation test, there was a significant correlation between the total catch and the discarded catch (r = 0.759); the size of discarded catch increased as the catch increased (P = 0.000). It was clear from the data that overfishing was seen in the commercial species.