Description
Siganus virgatus, commonly known as the barhead spinefoot or doublebar rabbitfish, is a marine ray-finned fish belonging to the family Siganidae.
Morphology & Appearance
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Size: Reaches a maximum length of 30 cm TL, with a common length of around 20 cm TL.
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Body Shape: Deep, laterally compressed body with a bulging head profile.
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Coloration: Pale silvery-white to yellowish base with a yellow back, dorsal fin, and caudal fin.
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Distinct Markings: Features two broad, diagonal dark/brown bands across the head and front of the body, adorned with pale blue spots and lines.
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Spines: Equipped with stout, venomous fin spines (13 dorsal spines and 7 anal spines).
Distribution & Habitat
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Geographic Range: Found throughout the Indo-West Pacific region, ranging from India and Sri Lanka to Indonesia, the Philippines, China, Taiwan, and Northern Australia.
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Depth & Environment: Inhabits shallow coral reefs, rocky substrates, estuaries, and mangroves at depths ranging from 1 to 20 meters.
Behavior & Diet
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Diet: Primarily herbivorous (grazing on benthic seaweeds and macroalgae like Sargassum), functioning as an important algae browser on reefs.
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Social Structure: Diurnal; juveniles often form groups, while adults are typically seen in pairs or living in isolation
