O. viverrini literature regarding snail diversity and the correlations between different snail species col- lected from various freshwater environments is, however, still limited, with the exception of Haruay et al. (2008), in which a neg- ative correlation between the abundance of Filopaludina martensi martensi snails and that of B.s. goniomphalos snails was identified. Nevertheless, the work can be further improved through standard- ized protocols of snail collections for quantification of biodiversity.