Breeding the Chestnut Blenny (Cirripectes castaneus)

Cirripectes castaneus is an algae-grazing eyelash blenny of wave-swept outer reefs that pairs to spawn and lays demersal adhesive eggs, with larval rearing not commercially established.

Overview

Cirripectes castaneus (family Blenniidae), the chestnut eyelash-blenny, ranges across the Indo-West Pacific from the Red Sea to Tonga and reaches about 9.2 cm standard length. FishBase places it on the wave-swept algal ridge of outer reef flats over rocky and coralline substrates at depths of roughly 0-10 m. It is herbivorous, feeding on algae.

Sexing

FishBase records the species as oviparous with distinct pairing. No reliable external sexing cues are documented for the aquarium, so a compatible male-female pair is identified by observing pairing and territorial behavior around a chosen hole or crevice.

Breeding Setup

Provide a mature reef aquarium with rocky and coralline surfaces, ample algal growth and small holes the blenny can occupy, mirroring its wave-swept reef-flat habitat. Stable shallow-reef parameters from the linked species record support spawning condition.

Spawning Behavior & Trigger

Reproduction follows the blenny pattern of distinct pairing: the female lays eggs within a sheltered hole or crevice that the male typically fertilises and guards. A secure cavity within the rockwork serves as the nest.

Egg & Fry Care

Eggs are demersal and adhesive, attached to the substrate by a filamentous adhesive pad or pedestal, and larvae hatch as planktonic forms found in shallow coastal waters. Rearing these larvae demands a dedicated larval system and graded live foods.

Common Challenges

The planktonic larval phase is the main hurdle, requiring tiny first-feeding prey and very stable water quality. Sustained algal grazing is needed to keep the broodstock healthy and breeding.