ISSN : 1225-3480
Benthic mollusk communities in the upper part of the Ba Lai River (the Mekong Delta), located upstream an irrigation dam, were investigated with respect to species composition, densities, biodiversity and some ecological aspects in 5 sampling stations. Densities of bivalve communities ranged from 21.5 ± 8.2 inds/10 cm2 to 28.5 ± 3.3 inds/10 cm2. In summary, 12 species from six Bivalvia families were recognised. Preliminary investigation on reproductivity of Corbicula blandiana showed the species is dioecious (specimens with separately female or male gonads were indicated), perhaps non-incubatory. Find of Meretrix lyrata, the most abundant commercial species in southern Vietnam, brings up a necessity on suitable policy and exploration in the Ba Lai to conserve valuable species for economic development and scientific purpose.
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