Pempheris adusta Bleeker, 1877
Dusky sweeper
photo by King, D.R.

Family:  Pempheridae (Sweepers)
Max. size:  17 cm TL (male/unsexed)
Environment:  reef-associated; marine; depth range 0 - 20 m
Distribution:  Indo-Pacific: widely distributed and abundant in the Indian Ocean (including the Red Sea to Andaman Sea) to the Pacific; not in the Mediterranean Sea. Regional variations present in the Indian, Andaman and the Pacific.
Diagnosis:  Dorsal spines (total): 6-6; Dorsal soft rays (total): 8-10; Anal spines: 3-3; Anal soft rays: 36-45; Vertebrae: 25-25. This species is distinguished by the following characters: pectoral fin base with a faint blackish spot; pored lateral-line scales 56-64 (Andaman Sea 52-58; Pacific 51-62); scale rows above lateral line 4.5-6.5 (usually 5.5; Andaman Sea and the Pacific Ocean, 4.5-5.5, usually 4.5); circumpeduncular scales 14-18 (usually 16); outer edge of anal fin with a distinct blackish band (rarely faint or only anterior half prominent; usually none in Pacific); posterior edge of caudal fin with a blackish band (caudal fin whole yellowish in Andaman Sea); upper-jaw length 14.2-15.6% SL; body depth 41.4-45.4% SL. Individuals in the Pacific are distinguished from its congeners by the following set of characters: ctenoid and deciduous scales are thin and semicircular in shape; 51-62 pored lateral-line scales; 4.5-5.5 (usually 4.5) scale rows above lateral line; pectoral fin base with a faint blackish spot; anal fin usually have no blackish outer margin; anal fin base with a dusky band (Ref. 95675).
Biology:  This fish is common on coral reefs (Ref. 6645); forming aggregations in caves or crevices or under overhangs (Ref. 48636) by day, but a few may at times be seen in the open, close to the shelter of reefs. This species is also observed forming small groups with Myripristis murdjan at 0.5-1 m below the surface. At night, it is known to feed on zooplankton (Ref. 94773). Spawning occur during April to June, and is year-round in Okinawa I. (Koeda et al., in press - in Ref. 95675). Spawning occurred after sunset with individuals larger than 11 cm SL joining the spawning group (Ref. 95675). Flesh is edible (Ref. 12484).
IUCN Red List Status: Not Evaluated (N.E.) Ref. (130435)
Threat to humans:  harmless


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