Population dynamics of mangrove clam Geloina expansa (Mousson 1849) (Mollusca Bivalvia) in a Malaysian mangrove system of South China Sea

Nurulafifah Yahya, . and Izwandy Idris, . and Noor Shahida Rosli, . and Zainudin Bachok, . Population dynamics of mangrove clam Geloina expansa (Mousson 1849) (Mollusca Bivalvia) in a Malaysian mangrove system of South China Sea. pp. 203-216. ISSN 1823-8556

Mangrove clam Geloina expansa is a common harvested resource in the Malaysian mangroves. Although the local communities extensively collect the species throughout the year information on the population dynamics of the species in Malaysia is limited. Population dynamics study is essential to help in adequate stock management during potential future commercial exploitation. The population dynamics of G. expansa from Setiu Wetlands were determined by shell length and wet weight for 18 months (from January 2016 to June 2017). The estimated growth parameters using von Bertalanffy growth equation were; L 76.1 mm and K 0.7 year“1. The total mortality (Z) rates were expected to be 2.1 year“1. The fishing mortality (F) rates (1.0 year“1) are almost similar to natural mortality (M) rates (1.1 year“1) whilst observed exploitation (E) rates (0.5 year“1) fall under optimised position in the stock with exploitation rates of Emax 0.5. Therefore there is a need to regulate rules such as time limit legal harvesting size and licence implementation of this organism to avoid population from declining. This study suggests possible step to be taken to ensure the sustainability of G. expansa to thrive in the future.

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Abstract

Mangrove clam Geloina expansa is a common harvested resource in the Malaysian mangroves. Although the local communities extensively collect the species throughout the year information on the population dynamics of the species in Malaysia is limited. Population dynamics study is essential to help in adequate stock management during potential future commercial exploitation. The population dynamics of G. expansa from Setiu Wetlands were determined by shell length and wet weight for 18 months (from January 2016 to June 2017). The estimated growth parameters using von Bertalanffy growth equation were; L 76.1 mm and K 0.7 year“1. The total mortality (Z) rates were expected to be 2.1 year“1. The fishing mortality (F) rates (1.0 year“1) are almost similar to natural mortality (M) rates (1.1 year“1) whilst observed exploitation (E) rates (0.5 year“1) fall under optimised position in the stock with exploitation rates of Emax 0.5. Therefore there is a need to regulate rules such as time limit legal harvesting size and licence implementation of this organism to avoid population from declining. This study suggests possible step to be taken to ensure the sustainability of G. expansa to thrive in the future.

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Item Type:	Article
AGROVOC Term:	Clams
AGROVOC Term:	Bivalves
AGROVOC Term:	Mollusca
AGROVOC Term:	Sampling
AGROVOC Term:	Mangroves
AGROVOC Term:	Wetlands
AGROVOC Term:	Animal morphology
AGROVOC Term:	Length
AGROVOC Term:	Mortality
AGROVOC Term:	Longevity
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:29
URI:	http://webagris.upm.edu.my/id/eprint/25004

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