Red-streaked blenny

Geographical Origin and Habitat: Cirripectes stigmaticus is widely distributed across the tropical Indo-Pacific, from the coast of East Africa and the Red Sea to the Line Islands, extending north to southern Japan and south to the Great Barrier Reef and Tonga. It inhabits surge-swept rocky reefs, tide pools, and shallow outer reef slopes at depths of 1 to 15 meters, where intense sunlight promotes a rich growth of benthic microalgae.

Taxonomy and Morphology: Belonging to the family Blenniidae, subfamily Salariinae, and genus Cirripectes. Described by Playfair and Günther in 1867. This blenny features an elongated, scaleless body covered in a protective layer of mucus. The head is rounded, featuring a downward-pointing mouth with comb-like teeth for scraping algae, and small tentacular cirri above the eyes. Adults reach 10-12 centimeters.

Social Behavior: A diurnal and solitary fish that fiercely defends its grazing territory on the rocks from other blennies or similar-looking food competitors. It spends the day darting from rock to rock, rasping algae, and retreating backward into its preferred crevice if threatened, exposing only its head. It has an expressive personality.

Coloration and Sexual Dimorphism: The coloration is striking, featuring a dark brown or black body covered with a complex grid-like pattern of bright red or orange lines on the head and flanks. Sexual dimorphism is present in mature males, which exhibit brighter red coloration, slightly longer dorsal and anal fins, and modifications to their urogenital papilla during spawning.

Aquarium Setup: Requires an aquarium of at least 150 liters with a large amount of established live rock. The rockwork should provide ample lit grazing surfaces and numerous small caves or holes where the blenny can shelter. A well-established tank with natural benthic algal growth is essential to support its dietary needs.

Diet and Feeding: An herbivorous specialist that feeds on microalgae and organic film covering the rocks. In captivity, it must be offered high-quality plant-based foods, such as dried nori sheets, spirulina pellets, and herbivore flakes. It may occasionally eat frozen foods like mysis, but these should not make up the main diet.

Water Quality: Demands clean and stable reef parameters. Water temperature between 24°C and 28°C, pH of 8.1 to 8.4, specific gravity of 1.023 to 1.025, and dKH between 8 and 12. Strong water movement and high oxygenation are critical to simulate its natural surge-swept reef habitat. Keep nitrates and phosphates low.

Compatibility and Cohabitation: Generally peaceful toward most other fish families. However, it shows strong territorial aggression toward other blennies or fish with similar diets (like small tangs in smaller enclosures). It is safe with corals, though it may nip at them if it is underfed and lacks algal food source.

Aquarium Breeding: Breeding in captivity is extremely rare. They are oviparous, laying adhesive eggs in small cracks or empty shells. The male guards and fans the nest until hatching. The larvae are planktonic and require microscopic live feeds, making rearing them in standard setups highly difficult.

Risks and Diseases: Starvation is the biggest risk if introduced into a sterile or new tank without algae. It can contract marine ich if stressed. Because blennies are known to jump when startled, the aquarium must have a tightly fitting mesh cover to prevent them from jumping out.