Tweddle's damselfish (Chromis tweddlei) is a ray-finned fish of the family Pomacentridae. It inhabits marine (saltwater) waters in reef-associated environments. This species can reach a maximum total length of 11.1 cm. It occurs at depths between 214 and 219 metres. With a trophic level of 3, it is a low-level carnivore, feeding on invertebrates and small organisms.
Dorsal spines (total): 4; Dorsal soft rays (total): 13 - 14; Anal spines: 2; Anal soft rays: 13 - 14. This species is distinguished by the following set of characters: body depth 2.0-2.1 in SL; D XIV, 13-14; A II, 14 (rarely 13); pectoral-fin rays 20 (rarely 19); procurrent spiniform caudal-fin rays 2; tubed lateral-line scales 18-19; scales above lateral line to dorsal-fin origin 4; circumpeduncular scales 13-14; gill rakers 8-9 + 21-23, total gill rakers 29-32; maxilla ending at vertical at anterior margin of orbit; black caudal band tapering anteriorly (anterior edge v-shaped) the full length of the caudal peduncle; caudal fin yellow with black posterior margin; distal third of anal fin blackish; dorsal fin yellow; upper half of pectoral fin yellow .: short and / or deep; Cross section: compressed.
Behavioural data for Tweddle's damselfish is currently being reviewed.
Marine; reef-associated; depth range 214 - 219 m . Tropical Indian Ocean: Mauritius.
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