Rippled rockskipper
Istiblennius edentulus
The Rippled rockskipper exhibits a streamlined body with mottled brown and yellowish patterns, featuring a prominent, elongated dorsal fin.
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About the Rippled rockskipper
This is that intertidal blenny you see hopping between tidepools - it can breathe air for short periods and literally skip across wet rocks. Males grow a little head crest and both sexes show those broken, ripple-like bars that look great against algae-covered rock. It is a jumper and a grazer, so it does best where it can browse natural film algae.
Also known as
Quick Facts
Size
16 cm (about 6.3 inches)
Temperament
Semi-aggressive
Difficulty
Intermediate
Min Tank Size
70 gallons
Lifespan
3-5 years
Origin
Indo-Pacific
Diet
Herbivore - primarily filamentous algae; offer nori/seaweed and algae-based prepared foods; may nip corals if underfed.
Water Parameters
24.7-29.3°C
8.1-8.4
Need a heater for this species?
This species needs 24.7-29.3°C in a 70 gallon tank. Use our heater calculator to find the right wattage.
Calculate heater sizeCare Notes
- Give it a 70+ gallon marine tank with lots of mature live rock; this grazer does best when it can constantly browse natural film algae.
- Use a tight-fitting lid with all gaps covered; the rippled rockskipper is a determined jumper that can breathe air briefly and will skip across wet surfaces.
- Hold temperature at 24.7-29.3 C and pH at 8.1-8.4, and avoid big swings.
- Feed as an herbivore: offer nori/seaweed and algae-based prepared foods, and clip or tuck sheets to rock so it can graze.
- In reef tanks, keep it well fed and watch for coral nipping if its algae needs are not met.
- Semi-aggressive and territorial around perches and algae patches; avoid mixing with similar algae-grazing blennies in modest tanks and pick tankmates that are not easily bullied.
- It reaches about 16 cm and lives 3-5 years, so plan the rockwork with multiple perches and sight breaks.
Compatibility
Good Tankmates
- Peaceful midwater wrasses that ignore rock perches, like fairy and flasher wrasses (Cirrhilabrus, Paracheilinus)
- Small, peaceful clownfish pairs such as ocellaris or percula that keep to their own area
- Cardinalfish (Banggai, pajama) that are calm and non-competitive with algae grazers
- Sand-sifting or watchman gobies (Valenciennea, Amblygobius) that occupy the sandbed, not the rock ledges
- Reef-safe clean-up crew inverts like snails, small urchins, and cleaner shrimp
- Peaceful schooling fish like blue-green chromis that stay in the water column
Avoid
- Other rock-perching, algae-grazing blennies (Salarias, Atrosalarias, Ecsenius, other Istiblennius) that compete for the same algae and ledges
- Territorial bullies like dottybacks, aggressive damselfish, and maroon clownfish that will harass a rockskipper
- Large predatory fish (groupers, lionfish, big moray eels) that may view it as food
- Nippy or boisterous species like triggers and large Thalassoma-type wrasses that may bite or outcompete it
Rippled rockskipper (Istiblennius edentulus) is a medium combtooth blenny from the Indo-Pacific. It reaches about 16 cm and lives 3-5 years in aquaria. This is the intertidal blenny that can gulp air for short periods and literally skip across wet rocks. Males develop a small head crest, and both sexes show broken, ripple-like bars that look striking against algae-covered rock. Care is intermediate.
This fish is an expert jumper and climber. Keep a tight, gap-free lid and cover overflows.
Origin and natural habitat
Found in the Indo-Pacific, the rippled rockskipper lives in shallow, wave-washed intertidal zones. It spends much of its time on and among algae-coated rocks, grazing filamentous growth and ducking into cracks as water surges. Its ability to breathe air briefly lets it move between tidepools and even rest on damp rock.
Aquarium setup and water conditions
Give it room and real grazing space. A minimum of 70 US gallons lets this active blenny patrol without constantly clashing with tankmates. Use substantial rockwork with many crevices and perches and allow natural film algae to establish on surfaces. A tight-fitting lid is non-negotiable.
- Water: marine
- Temperature: 24.7-29.3 C
- pH: 8.1-8.4
- Minimum tank size: 70 US gallons
Let new rock mature before adding this fish. A tank with stable parameters and visible film algae makes the transition far easier for a grazer.
Diet and feeding
Herbivore. In nature it scrapes filamentous algae. In the aquarium, encourage constant browsing on natural film algae and supplement daily with seaweed and algae-based prepared foods.
- Clip nori or other seaweed so it can pick throughout the day
- Offer algae-based pellets or gels sized for blennies
- Feed small amounts 2-3 times daily if natural algae is limited
May nip corals if underfed. In reef tanks, keep it well supplied with algae to reduce exploratory nipping.
Behaviour and tankmates
Semi-aggressive. Expect it to claim a patch of rock and defend perches, especially from similar-shaped algae grazers and other blennies. It spends time perched, darting, and making short hops between ledges.
- Keep one per tank unless the system is very large with multiple territories
- Mix with dissimilar, moderately robust fish that will not contest its grazing zone
- Reef with caution due to possible coral nipping if food is scarce
Common problems and how to avoid them
- Jumping and escapes: Use a tight lid and block cable gaps and overflow teeth.
- Starvation in sterile tanks: Provide mature rock and daily algae-based foods.
- Territorial skirmishes: Avoid housing with similar blennies or algae specialists in smaller systems.
- Handling out of water: It can breathe air briefly, but do not rely on this. Net and transfer carefully to prevent injury.
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