Effects on trawl selectivity of growth and reproduction in Diplodus annularis L. of Izmir Bay (Aegean Sea)

Trawl selectivity in annular sea bream (Diplodus annularis) of Izmir Bay wa s studied from October 1997 to September 1999, with 26 valid hauls (6 in sp ring, 5 in simmer, 9 in autumn, 6 in winter). The 50 % retention lengths of the trawl codend having a diamond mesh (44 mm) were 12.7 cm in spring, 13. 2 cm in summer, 10.7 cm in autumn, and 10.6 cm in winter. The selectivity o f the trawl improved with the increase in the activity of the Fishes due to rising water temperatures in spring and summer, but it was not affected by reproduction in spring.