Abstract
In this study, the length-weight relationship (LWR) and condition factor (CF) of Mesopotamian spiny eel Mastacembelus simack (Banks & Solander, 1794) caught from the Tigris River and Murat River basins between 2014 and 2016 were investigated. While the length of the fishes ranged between 24.00 and 67.40 cm for Tigris basin and 27.20 and 60.50 cm Murat basin, the weights changed between 31.70 and 585.30 g for Tigris basin and 38.20 and 385.00 g for Murat basin. It was determined positive allometric growth in individuals with a length of between 27.20 and 31.80 cm (b=3.54) in Murat Basin, 41.20 and 52.80 cm (b=3.27), and 53.70 and 67.40 cm (b=4.77) in Tigris Basin, while negative allometric growth (b<3) was determined in total all samples of both basins. The length-weight relationship was found as W=0.005L2.73 (R2=0.94) for Tigris and W=0.005L2.75 (R2=0.97) for Murat rivers. Average CF has the same value (CF=19) for Tigris and Murat rivers basin fish.
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