Seasonal variation in the trawl codend selectivity of picarel (Spicare smaris)


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Oezbilgin H., TOSUNOĞLU Z. , TOKAÇ A. , Metin G.

ICES JOURNAL OF MARINE SCIENCE, vol.64, no.8, pp.1569-1572, 2007 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 64 Issue: 8
  • Publication Date: 2007
  • Doi Number: 10.1093/icesjms/fsm115
  • Title of Journal : ICES JOURNAL OF MARINE SCIENCE
  • Page Numbers: pp.1569-1572
  • Keywords: Aegean Sea, picarel (Spicara smaris), seasonal variation, trawl selectivity, TURKISH BOTTOM-TRAWL, END SELECTIVITY, SEA, HADDOCK

Abstract

Seasonal selectivity of commercial 40 mm polyethylene codend was tested for picarel (Spicara smaris) in spring (4-18 April 2002), summer (10-25 July 2002), autumn (26 September-2 October 2002), and winter (22-23 January 2003) in the Aegean Sea. Data were collected using the covered codend technique and analysed using the logistic equation with the maximum likelihood method. Four sets of selection curves were analysed and compared using the model developed by Fryer (1991). Highest L-50 is in autumn (13.82 cm; s.e. 0.62), when water temperature is highest and the fish are expected to be in their best condition after summer feeding. Lowest L-50 is in spring (11.09 cm; s.e. 0.51), when water temperature is lowest and the fish are at their spawning stage. However, there is not sufficient evidence to say that the seasonal variation in the selectivity of 40 mm polyethylene codend for picarel is statistically significant (p > 0.05).