Population dynamics and aquaculture potential of the mud clam Geloina expansa (Mousson 1849) (Bivalvia: Cyrenidae) in loay-loboc river Bohol Central Philippines

Ilano Anthony, . and Argente Francis Albert Tabo, . Population dynamics and aquaculture potential of the mud clam Geloina expansa (Mousson 1849) (Bivalvia: Cyrenidae) in loay-loboc river Bohol Central Philippines. pp. 43-55. ISSN 2672-7226

The status of the mud clam Geloina expansa an important bivalve in the artisanal fisheries of the Loay-Loboc River was assessed using monthly shell length frequency data (October 2012 to January 2015) to estimate population parameters. Growth parameters derived were L 91.35 mm K 0.75 yr- and t‚ -0.16. Predicted Lmax was 90.39 mm. Estimated growth rates showed fast growth for the first two years. Longevity is approximately 6.1 years. Length-weight relationship showed a positive allometric growth (r 0.94). The estimated total mortality (Z) was 2.89 yr-1. Natural (M) and fishing (F) mortalities estimates were 0.90 yr-1 and 1.99 yr-1 respectively. Estimated exploitation rate (E 0.69) was higher than the maximum sustainable exploitation (Emax 0.41). Two annual recruitment peaks occurred during the months of December to February and July to August. Monthly condition index (CI) suggested that spawning is year-round. It appeared that the variations in CI of G. expansa in the river was influenced by the water temperature and salinity (r 0.54; P 0.0001). These biological information may be used for aquaculture technique development for G. expansa in central Philippines which will aid in the conservation and management of natural stocks.

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Abstract

The status of the mud clam Geloina expansa an important bivalve in the artisanal fisheries of the Loay-Loboc River was assessed using monthly shell length frequency data (October 2012 to January 2015) to estimate population parameters. Growth parameters derived were L 91.35 mm K 0.75 yr- and t‚ -0.16. Predicted Lmax was 90.39 mm. Estimated growth rates showed fast growth for the first two years. Longevity is approximately 6.1 years. Length-weight relationship showed a positive allometric growth (r 0.94). The estimated total mortality (Z) was 2.89 yr-1. Natural (M) and fishing (F) mortalities estimates were 0.90 yr-1 and 1.99 yr-1 respectively. Estimated exploitation rate (E 0.69) was higher than the maximum sustainable exploitation (Emax 0.41). Two annual recruitment peaks occurred during the months of December to February and July to August. Monthly condition index (CI) suggested that spawning is year-round. It appeared that the variations in CI of G. expansa in the river was influenced by the water temperature and salinity (r 0.54; P 0.0001). These biological information may be used for aquaculture technique development for G. expansa in central Philippines which will aid in the conservation and management of natural stocks.

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Item Type:	Article
AGROVOC Term:	Clams
AGROVOC Term:	Gene frequency
AGROVOC Term:	Population growth
AGROVOC Term:	Data analysis
AGROVOC Term:	Nature conservation
AGROVOC Term:	Bivalves
AGROVOC Term:	Nypa
AGROVOC Term:	Estuarine environment
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:55
URI:	http://webagris.upm.edu.my/id/eprint/9818

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