تقدير المساحة التنفـسية لغلا صم أسمـاك البـني ((Gunther , 1872 Barbus sharpeyi في نهر الديوانية .

Abstract

The present study deals with gills surface area of one species of Teleost, Barbus sharpeyi which belongs to family Cyprinidae. In present study used different length and weight groups from Barbus sharpeyi .Its range (80 – 220 mm and 29.76 – 550.25 gm).They are collected from Al-Diwaniya river from region which the river pass nearly Al-Saniya district to the town center by using gill nets . The study of gill area (mm² ⁄gm) shows that the fish length groups differ in gill area (mm² ⁄gm) .The lower length groups have large gill surface area (192.1mm² ⁄gm) whereas the higher length groups have lower gill surface area(38.64mm² ⁄gm) ,due to the increasing value of the total length of the gill filaments (L). The fish of the present study is placed in the category of sluggish activity species that have relatively small gill area.