Guam barred butterflyfish (Roa uejoi) is a ray-finned fish of the family Chaetodontidae. It inhabits marine (saltwater) waters in reef-associated environments. This species can reach a maximum total length of 10.1 cm. With a trophic level of 3.6, it is a mid-level predator.
Dorsal spines (total): 11; Dorsal soft rays (total): 21 - 22; Anal spines: 3; Anal soft rays: 16 - 17; Vertebrae: 24. This species is distinguished from its congeners by the following set of characters: pored lateral-line scales 36-43; distal portion of the outer branch of first pelvic-fin soft ray a long filament, extending considerably from posterior contour of fin, first soft ray length 119%-123% of second ray; no black blotch on membranes associated with the first and second dorsal-fin spines; upper jaw naked, scaleless; pelvic-fin spine and first soft ray broadly whitish, and the remaining portions of fin black (in preserved specimens); the second black body band crossing pectoral-fin base, with no pale narrow interrupting lines; ocellated spot on dorsal-fin soft-rayed portion is more circular than oval, ratio of long axis/short axis of blotch 1.2-1.3 .Cross section: compressed.
Behavioural data for Guam barred butterflyfish is currently being reviewed.
Diet information for Guam barred butterflyfish is currently being compiled.
Reproduction data for Guam barred butterflyfish is currently being compiled.
Marine; reef-associated; depth range ? - 172 m . Tropical
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