Threefinger threadfin (Eleutheronema tridactylum) is a ray-finned fish of the family Polynemidae. It inhabits marine (saltwater) waters in pelagic environments. This species can reach a maximum total length of 25 cm. With a trophic level of 3.6, it is a mid-level predator. It is assessed as Data Deficient on the IUCN Red List.
Dorsal spines (total): 9; Dorsal soft rays (total): 13 - 14; Anal spines: 3; Anal soft rays: 14 - 15. Pectoral filaments 3; fin membranes uniformly brown like all other fins. Vomer lacks deciduous tooth plates on both sides throughout its life history. Posterior part of maxilla shallow, 2-3% of SL. Long tooth plate extension onto lateral surface of lower jaw, 9-10% SL .: fusiform / normal; Cross section: compressed.
Behavioural data for Threefinger threadfin is currently being reviewed.
Marine; brackish; pelagic-neritic. Tropical; 14°N - 8°S, 97°E - 130°E known only from Thailand, Malaysia, and western Indonesia.
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