Common name: Barnacle Blenny

General Information

The Barnacle Blenny, scientifically known as Acanthemblemaria macrospilus, is a small, charismatic fish that has captured the hearts of many aquarists. Known for its curious nature and unique appearance, this blenny is a delightful addition to small reef aquariums. It is characterized by its elongated body, large eyes, and a distinct habit of peering out from empty barnacle shells or rock crevices, which provide both shelter and a vantage point for observing its surroundings.

While not as widely recognized as some other marine species, the Barnacle Blenny is appreciated by hobbyists for its entertaining behavior and relatively easy care requirements. Its presence in the aquarium adds a dynamic element, as these fish are often seen darting out to grab food and quickly retreating to their safe havens.

Care

Caring for the Barnacle Blenny is relatively straightforward, making it suitable for aquarists of all levels. They thrive in well-established aquariums with plenty of hiding spots, such as barnacle clusters, rock crevices, or even artificial structures designed to mimic their natural habitat. These fish are not demanding in terms of space, and a small tank can comfortably house a single blenny.

To ensure the well-being of the Barnacle Blenny, maintain stable water conditions with regular monitoring of parameters. While they are hardy, sudden changes in water quality can stress these fish, making them susceptible to disease.

Diet and Feeding

Barnacle Blennies are carnivorous and have a preference for meaty foods. In the wild, they feed on small crustaceans and zooplankton. In captivity, they can be fed a variety of foods, including frozen mysis shrimp, brine shrimp, and finely chopped seafood. Offering a varied diet helps maintain their health and vibrant coloration.

Feed them small portions once or twice a day, ensuring that the food reaches their hiding spots. These fish are quick to learn feeding routines and will eagerly emerge from their shelters when food is introduced into the tank.

Behavior and Compatibility

The Barnacle Blenny is known for its peaceful temperament, making it a good fit for community tanks. It generally coexists well with other small, non-aggressive fish. However, they can be territorial towards their own kind, especially if suitable hiding spots are limited. Providing ample hiding places can help mitigate this behavior.

These blennies exhibit interesting behaviors, such as peeking out from their chosen spots and rapidly retreating when startled. Their antics are a source of entertainment and fascination for many aquarists.

Symbiosis

While the Barnacle Blenny does not engage in symbiotic relationships like clownfish and anemones, its relationship with its chosen barnacle or crevice can be considered a form of commensalism. The blenny benefits from the protection and vantage point provided by the barnacle shell, while the barnacle remains unaffected.

Health and Common Issues

Barnacle Blennies are hardy fish, but like all marine species, they can be susceptible to common ailments such as ich or marine velvet if water quality is not maintained. Regular water changes and monitoring are crucial to prevent outbreaks.

When selecting a Barnacle Blenny, look for individuals that are active and alert, with clear eyes and smooth fins. Avoid fish that appear lethargic or have visible signs of disease.

Habitat

Naturally found in the tropical waters of the eastern Pacific Ocean, the Barnacle Blenny inhabits rocky reefs and tidal pools. They are often seen in areas with abundant barnacle growth, where they utilize empty shells as their homes. These environments provide them with both protection from predators and access to food carried by the currents.