تخمين پارامترهاي رشد، مرگ و مير و ضريب بهره‌برداري ماهي كفشك گرد در شمال غربي خليج‌فارس‌

Growth parameters, fIShing and natural mortality and exploitation rate estimation of BUTyg/ossa orienta/is (Bloch and Schneider, 1801) in west-north of the Persian Gulf

We used commercial fishing data and samples in the Choebdahlanding near Abadanport to estimate population dynamic parameters for Euryglossa orientalis. Sampling period was October 2004 to October 2005. After collecting the samples, they were transported to the laboratory for further biometry measurements. The minimum and maximum length was 12 and 40cm respectively. Length-weight relationship was calculated as: W:::: 0.0004"LB S86 40. According to the equation, growth of Euryg/ossa orientalis is allometric. Length frequency data were processed in FiSAT-n package. Growth coefficient was estimated at K = 0.28, infinite length was 37.57cm, totalmortality was Z:::: 2.09, naturalmortalitywas M:::: 0.92, and fishing mortality was F :::: 1.17. Exploitation rate was calculated at E :::: 0.56 and since the E valuewas higher than0.5, over-fishing is expected to be happening to the species. • CorrespoDding