Population dynamics and aquaculture potential of the mud clam, Geloina expansa (Mousson, 1849) (Bivalvia: Cyrenidae) in loay-loboc river, Bohol, Central Philippines
2021
Ilano, Anthony | Argente, Francis Albert Tabo
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-¹ and tₒ = -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 (r² = 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 (r² = 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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