Population dynamics of the green mussel Perna viridis from the high spat-fall coastal water of Malacca, Peninsular Malaysia

Abstract

Population parameters such as asymptotic length (L ∞ ), growth coefficient (K), mortality rates (Z, F and M), exploitation level (E) and recruitment pattern of green mussel Perna viridis were estimated using length-frequency data from the coast of Malacca, Peninsular Malaysia. Asymptotic length (L ∞ ) was 102.38 mm and growth coefficient (K) was estimated at 1.50 year −1 . Total mortality (Z) for P. viridis was 2.48 year −1 , while natural mortality (M) and fishing mortality (F) were 1.69 and 0.79 year −1 , respectively. The growth performance index was (ϕ ) 4.197 and the exponent "b" of the length-weight relationship was 2.602 (±0.02) during the study period. The asymptotic wet weight estimated from length-weight relationship was 40.81 g. Exploitation level (E) of P. viridis was 0.32 while the maximum allowable limit of exploitation (E max ) was 0.43. The recruitment pattern was continuous with one major peak in the months of July-August. The exploitation level (0.32) and lower fishing mortality (0.79 year −1 ) indicate that the green mussel is under-exploited from Malacca coastal waters.

Population Parameters of Siluroid Catfish (Eutropiichthys vacha) from Indus River, Pakistan

“…There are a number of tools to evaluate exploitation level and the stock situation, of these FiSAT-II software (FAO-ICLARM Stock Assessment Tools) is the most often and widely used for the estimation of fish population parameters and requires only a length frequency data (Al-Barwani et al, 2007;Tah et al, 2010).…”

Mortality, recruitment pattern and exploitation rates of two Schilbe Oken, 1817 populations: Schilbe mandibularis and Schilbe intermedius from the Aghien Lagoon; estuarine system of West Africa

“…This software is the most frequently used to estimate fish population parameters (Al-Barwani et al, 2007), because of relatively simple application, requiring only length frequency data. In addition, the only necessary and sufficient condition for the use of the FiSAT II package, for a species, is to have data of frequency distributions of lengths of at least 100 fish distributed over 10 to 20 length classes (Ahouanssou, 2011).…”

Population dynamics of the freshwater clamGalatea paradoxafrom the Volta River, Ghana

“…Other studies on G. paradoxa did not report on its recruitment pattern; however, studies elsewhere on tropical bivalves are in agreement with this finding. Al-Barwani et al (2007) reported a continuous year-round recruitment pattern with a major peak between July-August for Perna viridis in the coastal waters of Malacca, Malaysia. Modiolus metcalfei from Panguil Bay, Southern Philippines, has a unimodal recruitment pattern with the peak of recruitment between May-July (Tumanda Jr. et al, 1997).…”

“…For the sustainable management of mollusc resources, knowledge of various population parameters and exploitation level (E) of the population is required. There are many tools for assessing exploitation levels and the population dynamics of a stock, however, the FAO-ICLARM stock assessment tools (FiSAT) has been most frequently used for estimating population parameters of finfish and shellfish (Vakily, 1992;Mancera and Mendo, 1996;Al-Barwani et al, 2007) because it needs only length-frequency data. Despite its commercial importance there is limited information on the population dynamics of G. paradoxa in the Volta River.…”