دراسة مقارنة لبعض الصفات المظهرية لغلاصم سمكتي الخشني Liza abuوالحمريBarbusluteus في شط الهندية بمحافظة كـربلاء . (*)

Abstract

The present study deals with acomparative study of the estimation of gill surface area of two species of teleostswich belong to two different families , They are the Lizaabubelong to the Mugilidea and other species is Barbusluteusbelong to the Cyprinidea . In this study , used (100) fishes for each species had different length between (111-185 mm) , They were divided into five different length groups to study the effect the fish length on the gill surface area that contains (The average of total length of gill filaments (L) , Number of secondary lamellea in per 1mm (N) and the area of the secondary lamellea (BL) . Our present study showed differ the studied species in valves of gill surface area were especially the (L) among the studied length groups when the study of correlation factor (r) between the relation ships , It was (0.987 – 0.997) in L.abu and B.luteus , while were reflexion relation between the fish length and number of secondary lamellea per 1mm at the same studied species (ــ 0.982 - ــ 0.990) , but the vales (r) were between (0.825 – 0.926) in two studied species to study the correlation between the fish length and the area of secondary lamellea (BL) . The results in present study showed the effect the fish length on the total gill surface area (mm2) while the fish weight were effected on the relative gill surface area (mm2/ gm) .According to these result of the studied species put in the sluggish fish or slow swimming , The L.abuhave (60.10 mm2/ gm) while the B.luteus have (64.47 mm2/gm) wich compared with other studies .