Day's thryssa (Thryssa dayi) 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 21.5 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 - 46. Belly with 25 to 27 keeled scutes from isthmus to anus. Tip of snout a little above level of eye center. Maxilla long, reaching to pectoral fin base; first supra-maxilla minute, oval; teeth in jaws enlarged. Tip of first pectoral fin ray elongated into a short filament. Gill arches pinky orange, basibranchials black, inside of gill cover pale yellow or golden.: elongated; Cross section: compressed.
Behavioural data for Day's thryssa is currently being reviewed.
Marine; pelagic-neritic; depth range 0 - 50 m . Tropical; 27°N - 6°N, 64°E - 78°W north to Pakistan, possibly to Gulf of Oman.
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