The blue seachub (Kyphosus cinerascens) belongs to the Kyphosidae family. It inhabits coastal tropical waters at depths of 1 to 50 meters. Large and small schools of this fish are found near reefs and in lagoons. During the day, they usually swim in open water below the surface, preying on zooplankton. At night they stay at the bottom solitary or in small groups.
Blue seachub feed on seaweed, biting it off rocks or dead coral. They often enter areas with strong waves and gather torn pieces of algae. Juveniles can be found offshore among aggregations of drifting seaweed. They are timid and quickly escape from danger.
Blue seachub have an oblong flat body. It is grey-blue in colour with thin yellow lines or dots located in rows. Its back is darker than the belly. Small scales cover the head and the bases of its fins. The head is small with a small mouth. There is a row of wedge-shaped incisor-like teeth on each jaw with tiny needle-like teeth behind.
Cantharus maculatus, Khyphosus cinerascens, Kyphosus indicus, Pimelepterus altipinnis, Pimelepterus altipinnoides, Pimelepterus cinerascens, Pimelepterus dussumieri, Pimelepterus indicus, Pimelepterus raynaldi, Pimelepterus tahmel, Scorpis vinosa
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