Fishes of Japan(Nakabo, 2002)
Dorsal rays XIII, 12-13; Anal rays II, 12-14; pectoral rays 18-19; lateral-line scales 16-19; Gill rakers 17-19; body depth 2.2-2.4 in standard length. Body moderate to slender. Posterior margin of preopercle smooth. No scales on infraorbitals; cheek with 2 rows of scales. Body brilliant light-blue. This species exhibits a marked sexual dichromatism: juveniles and females usually with a small black spot at the rear base of the dorsal fin and (at least in Micronesia) lack yellow; males sometimes with a bright yellow snout and tail, latter all orange in some regions; also lack the black spot.
Found amongst rubble and coral of clear sheltered lagoons and subtidal reef flats, at depth of 0 to 10m.. Occurs in groups of a male and several females or juveniles. Feeds on algae, pelagic tunicates and copepods.
Widely distributed in the Indo-West Pacific, including eastern edge of the Indian Ocean and Western Australia to New Guinea, New Britain, Solomon Islands, Marianas and Caroline Islands, Indonesia, Philippines, Taiwan and Ryukyu Islands. Also known from Va
Indo-West Pacific: eastern edge of the Indian Ocean and Western Australia to New Guinea, New Britain, Solomon Islands, Marianas and Caroline Islands, Indonesia, Philippines, Taiwan and Ryukyu Islands. Also known from Vanuatu and New Caledonia; Palau and Yap in Micronesia (Ref.
); Samoa (Ref.
Size / Weight / Age
range ? - ? cm
Max length : 8.5 cm TL male/unsexed; (Ref.
Adults are found amongst rubble and coral of clear sheltered lagoons and subtidal reef flats (Ref.
). They occur in groups of a male and several females or juveniles (Ref.
). Feed on algae, pelagic tunicates and copepods. Oviparous, distinct pairing during breeding (Ref.
). Eggs are demersal and adhere to the substrate (Ref.
). Males guard and aerate the eggs (Ref.
Preferred temperature (Ref.
): 25.9 - 29.3, mean 28.6 (based on 2106 cells).
Phylogenetic diversity index (Ref.
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01479 (0.00665 - 0.03288), b=2.98 (2.79 - 3.17), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref.
Trophic Level (Ref.
): 2.5 ±0.1 se; Based on diet studies.
): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
): Low vulnerability (17 of 100) .
Capuli, Estelita Emily
Luna, Susan M.
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