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Diversity and morphometry of edible, bivalve and gastropod classes of molluscs were investigated from July 2010 to January 2012, for a particular set of bivalve species, at selected coastal divisions of Sarawak including Kuching, Sibu, Mukah, Bintulu, Miri, Limbang, and Lawas. A total of 41 edible species were recorded and identified from 11 families of gastropods represented by 21 species, and from 12 families of bivalves represented by 20 species. For bivalves, species of the family Cyrenidae (Geloina erosa, G. expansa and G. bengalensis) were the most widely distributed bivalve species. The gastropod family Potamididae (Cerithidea obtusa, C. quadrata, C. rizophorarum and Telescopium telescopium) was also commonly observed over the entire seven divisions. Species diversity was found to be highest in Bintulu division for both classes, having 13 species of gastropods and 11 species of bivalves. Jaccard’s index showed high similarity amongst the edible bivalves for Limbang division with Miri division (0.75), and for Limbang with Lawas (0.75). For gastropods, Sibu versus Mukah showed high similarity (0.50). Morphometric study of the bivalves indicated that VPM/SL and LCT/SL features were applicable as an identification key to differentiate between Geloina spp. This morphometric identification key could be developed further for identification of other species in the mollusc family.

This data article presents the composition of selected physico-chemical water parameters, phytoplankton, flora and fauna in Sungai Kertih, Terengganu, Malaysia. Sungai Kertih is surrounded by mangrove forest and located nearby to a coastal hill namely Bukit Labohan that supports vast biological resources to its adjacent inhabitants. Therefore, a biodiversity and environmental assessment was conducted in Sungai Kertih from 19–21 August 2019 to document the biodiversity and physico-chemical water parameters of the river. The dataset show that Sungai Kertih is occupied by 14 tree mangrove species, 43 phytoplankton species, 21 bivalve species, 10 crustacean species, five amphibian species and eight reptilian species. The obtained physico-chemicals water parameters data were the value of pH, total dissolved solids, dissolved oxygen, temperature, salinity and electrical conductivity. Understanding the influence of physical and chemical properties on biological resources in coastal ecosystem is one of important in river conservation and management practices. Thus, this baseline dataset can be utilized for further reference and monitoring the health of the environment in the mangrove ecosystem.