Zebra-perch Sea Chub

Fascinating facts about the Zebra-perch Sea Chub

• Eleven sharp spines line the front of its dorsal fin, and they can be tucked into a scaly groove when the fish swims through tight rock crevices.
• The zebra-perch sea chub attains a maximum total length of 45 cm (18 in) and its body is wrapped in about ten vertical brown bars that break up its pale khaki camouflage on rocky reefs.
• Juveniles swap the typical herbivore menu for a cleaning gig, picking parasites off opaleye and shiner perch while hanging out in tide pools.
• They stay within eight metres (26 ft) of the surface, grazing on red, brown and green algae on coastal reefs before retreating into crevices at night.
• First described in 1889 by Jenkins and Evermann, this fish was once placed in its own genus Hermosilla until a 2013 review folded that name back into Kyphosus.

At a glance

About the Zebra-perch Sea Chub

The zebra-perch sea chub, Kyphosus azureus, is a sleek, oval-shaped fish whose body is cloaked in a pale khaki canvas pierced by ten striking brown vertical bars. A single blue spot crowns the upper edge of its gill cover, while a black dot rests beneath the base of the pectoral fin, and its underparts glow whitish. Its dorsal fin, armed with 11 spines that can be tucked into a scaly furrow, stretches longer than the softer nine-ray posterior portion, and a forked caudal fin propels it through the shallow, algae-rich waters of the eastern Pacific. Adults linger in the subtidal zone of rocky reefs and reef flats down to eight metres, while juveniles seek refuge in rock pools, often serving as cleaner fish for opaleye and shiner perch, a surprising role that underscores their ecological versatility. In the coastal corridors from Monterey Bay to the northern and central Gulf of California, this herbivore grazes on red, brown, and green algae, forming mixed schools with halfmoon, opaleye, and Pacific sergeant major. By day it forages openly, but at night it retreats into crevices, and its life cycle culminates in pelagic spawning, releasing eggs into the open water where currents carry them far beyond the familiar reef flats, ensuring the species’ continued presence across its range

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