THÀNH PHẦN LOÀI VÀ BIẾN ĐỘNG QUẦN ĐÀN CỦA CÁ LAU KÍNH (PTERYGOPLICHTHYS SPP.) Ở THÀNH PHỐ CẦN THƠ
Abstract
This study was conducted from April 2013 to March 2014 to identify species composition and population dynamics of the Sailfin Catfish in Can Tho City. The population parameters were estimated by using FiSAT II software to analysis the leght-frequency data. The results showed that two species namely Pterygoplichthys disjunctivus and Pterygoplichthys pardalis were identified. The population parameters of P. disjunctivus were also estimated from length-frequency data such as L? = 45 (cm), K = 0.89/ year, t0 = 0.20 year; total mortality Z = 1.86/year, nature mortality M = 1.49/year, fishing mortality F = 0.37/year. The resuts also indicated that there are two recruitment peaks with a distance between two peaks about 5 months. The results also showed that high nature mortality as compared with low fishing mortality of P. disjunctivus population.
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