Streaky Rockskipper

Fascinating facts about the Streaky Rockskipper

• A streak of six to seven irregular double bars runs along its sides, and a dark spot sits right between the first two spines of its dorsal fin, giving this tiny fish a built-in camouflage pattern that lets it melt into the rocky tide pools.
• At just 12 cm (4.7 in) long, it is small enough to fit in the palm of your hand, yet it thrives on shores where the water never exceeds a metre deep – a world where the tide can lift and drop it in seconds.
• From the Cape of Good Hope eastwards through the Indian Ocean to Palau, and north to the Ryukyu Islands of Japan, this blenny’s range spans the Indo-West Pacific.
• Males wear broad dark margins on their dorsal, anal and caudal fins while females scatter dusky spots over their bodies; they form pairs and lay sticky eggs that cling to the substrate before the larvae drift into shallow coastal plankton.
• The fish’s specific name honors Jean-Jacques Dussumier, a 19th-century French voyager.

At a glance

About the Streaky Rockskipper

The streaky rockskipper, Istiblennius dussumieri, is a modestly sized combtooth blenny that reaches up to 12 cm (4.7 in) in total length. Its dusky palette is broken by six to seven irregular double bars along the flanks, a dark spot perched on the anterior dorsal fin between the first two spines, and additional speckles on the dorsal and caudal fins. Females scatter dusky spots across their bodies that echo the male’s banding, while males sport bold dark margins on the dorsal, caudal and anal fins, giving each sex a distinct visual signature that flickers across the shallow reefs where they live. These blennies cling to the very edge of the intertidal zone, often in water less than a metre deep, favoring sheltered rocky shores and even mangrove fringes where they share space with the related Istiblennius edentulus. They are oviparous, forming monogamous pairs; the adhesive eggs cling to the substrate before hatching into planktonic larvae that drift in the shallow coastal waters.

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