Barbunya (Mullus barbatus L., 1758) ve Isparoz (Diplodus annularis L., 1758) İçin Standart ve Dar Trol Torbaların Seçiciliği
Makaleler > Tam Makale · 2007
Yazarlar: Muharrem Hakan KAYKAÇ
DergiPark (Istanbul University), Uluslararası, 2007
Özet
Selectivity of standard and narrow trawl codends for the red mullet (Mullus barbatus L., 1758) and annular sea bream (Diplodus annularis L., 1758).The bottom trawl codends (40 mm PE) used in conventional Turkish demersal fisheries has rather poor selectivity.For this reason, the improvements of the codend selectivity in the bottom trawl nets get importance from the point of view to protect of demersal fish stocks.In this study, selectivity properties of standard codend (200 meshes around the circumference) conventionally used in Turkish bottom trawl fisheries and narrow codend (100 meshes instead of 200 meshes around the circumference) had been searched for red mullet (Mullus barbatus) and annular sea bream (Diplodus annularis) in the Aegean Sea.Sea trials were carried out in İzmir Bay between 3 rd June and 27 th July 2004 on board R/V "Egesüf".Data were collected using the covered codend technique, and analyzed by means of a logistic equation with the maximum likelihood method.For the red mullet, it was shown that the narrow codend (L50=13.9cm) was higher an average L50 values than the standard codend (L50=11.8cm).However, there was no significant difference between average L50 values of the codends for the annular sea bream (p>0.05).As a consequence, it was determined that the narrowed codend compared to standard codend provided considerable improvements for the selectivity of red mullet. Key Words: Standard codend,