Nalbana Sanctuary is an island protected for the millions of birds visiting every year from different parts of the world. It also harbours a huge number of benthic organism which acts as feed for the migratory birds. While doing ground survey for the planktons, the sample was taken and studied under the Foldscope. The pigmented sample was identified to be bivalve veliger larvae.

The bivalve veliger is the planktonic larva of the bivalve molluscs which unlike shelled molluscs are not sedentary but free-floating. The free-floating nature of the veliger enhances the dispersion of the molluscs to far away regions. The general body plan includes a shell covering the visceral organs with a locomotive ciliated like structure called velum. The velum is used for swimming and feeding purposes. They feed on phytoplankton and are eaten by pelagic swimming fishes.