Bengal thryssa (Thryssa spinidens) is a ray-finned fish of the family Engraulidae. It inhabits marine (saltwater) waters in pelagic environments. This species can reach a maximum total length of 16.5 cm. It occurs at depths between 0 and 50 metres. With a trophic level of 3.4, it is a low-level carnivore, feeding on invertebrates and small organisms. It is assessed as Data Deficient on the IUCN Red List.
Dorsal spines (total): 0; Anal spines: 0; Anal soft rays: 41 - 45. Belly with 16 (rarely 17) + 11 to 13 = 27 to 29 keeled scutes from isthmus to anus. Tip of snout on level with upper rim of eye. Maxilla moderate, projecting a little beyond gill cover; first supra-maxilla minute, usually absent; teeth in jaws enlarged, especially in lower jaw. A dark blotch indistinct or absent behind upper part of gill opening; no dark lines along back.: elongated; Cross section: compressed.
Behavioural data for Bengal thryssa is currently being reviewed.
Marine; pelagic-neritic; depth range 0 - 50 m . Tropical; 25°N - 3°N, 85°E - 101°E south to the Indian Ocean coast of Thailand, perhaps to Pinang.
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