Breeding the Red-spotted Rockskipper (Blenniella chrysospilos)

Blenniella chrysospilos is an algae-grazing reef-flat blenny that pairs to spawn and lays demersal adhesive eggs in crevices, with no commercially established larval rearing.

Overview

Blenniella chrysospilos (family Blenniidae), the red-spotted blenny, occurs across the Indo-Pacific from the east coast of Africa to the Society Islands and reaches about 13 cm standard length. FishBase records it from clear coastal reef flats and surge-swept seaward reefs at depths of 0-6 m, where it enters small holes with just its head protruding. It feeds on algae with associated detritus and small invertebrates.

Sexing

FishBase records the species as oviparous with distinct pairing. No reliable external sexing characters are documented for the aquarium, so a compatible male-female pair is identified by observing pairing and the defence of a chosen hole.

Breeding Setup

Recreate the reef-flat habitat with a mature aquarium offering rock with small holes the fish can back into, strong algal growth and good water movement reflecting its surge-swept origins. Stable shallow-reef parameters from the linked species record support breeding condition.

Spawning Behavior & Trigger

Reproduction follows the blenny pattern of distinct pairing, with the female laying eggs inside a small hole or crevice that the male typically fertilises and guards. The hole the fish occupies in daily life doubles as the spawning 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 the planktonic larvae requires a dedicated larval system and graded live foods.

Common Challenges

The planktonic larval phase is the limiting step, needing tiny first-feeding prey and stable water quality. Adequate algal grazing and secure holes are needed to keep broodstock settled and in spawning condition.