Author(s): Krishna PV, K Glori Sathyavani and K Prabhavathi

Abstract: Interu Mangrove swamp located at 81°14′ E longitude and 16° 16′ N latitude is a shallow water body enclosed by the mangrove vegetation situated in the north-eastern part of the River Krishna estuarine region. The water levels in the swamp are subjected to variations depending on the tidal inflow and the incoming water from the irrigation canals from the river Krishna and during monsoon period the surface run off from the surrounding upland areas. Depending on the freshwater in flows in to the swamp, the depth of the swamp ranges from 2 to 3 meters and also varies during high tide and low tide periods. The biodiversity assessments were carried out during 2013–2018 and documented 76 species belonging to 54 genera, in 34 families and 9 orders, including two endemic (Acentrogobius griseus, Bathygobius ostreicola) and one exotic cichlid species (Oreochromis mossambicus). The Order Perciformes is the dominant whereas Gonorynchiformes, Siluriformes and Beloniformes are least representation. Of which 42 species are Not Evaluated (NE), 25 species are Least Concern (LC), 4 species are Vulnerable (VU); 3 species are Data Deficient (DD) and 2 species are while 39 species and 17 species from the Interu mangrove swamp. An account of faunal characteristics for 39 commercially important species is provided.

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