Chiang Mai Journal of Science

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The population parameters like asymptotic length, growth co-efficient, mortalities, recruitment rate and length-weight relationship of  green-lipped mussel, Perna viridis in the offshore waters of  the Naf  River were studied between February 2007 and January 2008. Monthly length frequency data of  P. viridis were analyzed using FiSAT software for estimating population parameters including asymptotic length (L ), growth co-efficient (K) and recruitment pattern to assess the status of the stock. Asymptotic length (L ), growth coefficient (K) and the growth performance index ( ) were calculated as 13.65 cm, 1.30 year^-1 and 2.38 respectively.  Total mortality (Z), natural mortality (M) and fishing mortality (F) were estimated at 1.90 year^-1, 1.09 year^-1, and 0.81 year^-1 respectively. The recruitment pattern was found continuous, displaying a double major peak event per year. The exponent ‘b’ value estimated for this species under study was below 3 (b<3) indicating that the growth pattern showed negative allometric growth.

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