Abstract
Species belonging to the genus Nausitora (Bivalvia - Teredinidae) are generally confined to brackish waters. In the Cochin backwaters, a tidal estuary on the southwest coast of India, this genus is represented by the species N. hedleyi Schepman. Fresh settlement of the species in the area is noticed only during the period of low salinity, though the species of found to exist, throughout the year. Tests conducted to ascertain the effect of salinity changes on the activity of the borer showed that though it can endure a wide range, the optimum salinity range for early development was from 11.24–14.54%.
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