Bu çal›flmada Temmuz 1996 ve fiubat 1997 aras›nda ‹zmir Körfezinde yürütülen trol seçicili¤i çal›flmalar› s›ras›nda toplanan barbunya (Mullus barbatus) (n = 953) ve ›sparozlar›n (Diplodus annularis) (n = 944) total boylar› (TL) ile çatal boy (FL), çevre (G), s›rt yüksekli¤i (H) ve genifllikleri (W) aras›ndaki iliflki araflt›r›lm›flt›r. Barbunyaya ait FL, G, H ve W de¤erlerinin s›ras›yla TL’nin yüzde 89, 53, 20, ve 11’ine eflit oldu¤u bulunmufltur. Bu de¤erler ›sparoz için s›ras›yla 91, 80, 34 ve 11’dir. Ortalama vücut kal›nl›¤› oran› (W/H) barbunyada 0,573, ›sparozda 0,319 olarak bulunmufltur. Bu türlerin küçük bireylerinin kaç›fl›n› kolaylaflt›rmak için tasarlan›lan torbalar›n donam faktörleri barbunya için (ERM) 0,497, ›sparoz için (EASB) 0,304 olarak hesaplanm›flt›r.

This study investigates the relationship between total length (TL) and fork length (FL), girth (G), height (H) and width (W) of red mullet (Mullus barbatus) (n = 953) and annular sea bream (Diplodus annularis) (n = 944) collected during trawl selectivity trials carried out in İzmir Bay between July 1996 and February 1997. The FL, G, H and W of red mullet were 89, 53, 20 and 11% of the TL, respectively. For annular sea bream these values were 91, 80, 34 and 11%, respectively. The ratios for average body thickness (W/H) were 0.573 for red mullet and 0.319 for annular sea bream. The hanging ratios (ERM and EASB) of codends designed to ease the escape of juveniles of these species were 0.497 for red mullet and 0.304 for annular sea bream.