Estuarine mouths vary considerably in salinity regime depending on freshwater discharge, tidal mixing, and geomorphology; euryhaline/hyperosmotic-tolerant elasmobranchs can only persist in specific estuaries whose salinity range matches their osmoregulatory tolerance.
Among the listed river mouths, Gautami (a distributary of the Godavari delta) provides the estuarine salinity and hydrographic conditions that a hyperosmotic-tolerant shark such as...
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