Fish atlas

Geographical Origin and Habitat: Valenciennea bella is native to the warm tropical waters of the Western Pacific Ocean. Its distribution is primarily focused around the southern Ryukyu Islands of Japan, Taiwan, and the Philippine archipelago. It inhabits the sandy slopes adjacent to coral reefs and protected coastal lagoons, generally preferring depths between 12 and 35 meters. In these biotopes, it occupies areas with deep, fine sand and coral rubble accumulations where it can dig burrows.

Taxonomy and Morphology: Belonging to the family Gobiidae, this species exhibits the typical elongated, sub-cylindrical body shape characteristic of benthic sand-sifting gobies. It features a large, downward-pointing mouth with fleshy lips, anatomically specialized for scooping up mouthfuls of sand to filter out food. The caudal fin is rounded or slightly trilobed. Adult specimens typically reach a maximum length of 12 to 15 centimeters.

Social Behavior: This is a peaceful, diurnal species that spends the majority of its active hours tirelessly sifting the substrate. They show no aggression toward other reef inhabitants but can exhibit notable intraspecific territorial behavior. It is best kept singly or as a mated pair, as individuals of the same sex will fight. Mated pairs are highly cooperative, working together to maintain and defend their burrow.

Coloration and Sexual Dimorphism: The coloration is exceptionally striking, featuring a light orange to peach-pink body contrasted by electric blue or metallic green horizontal stripes on the cheeks and below the eyes. The fins show vibrant red and yellow margins. Sexual dimorphism is subtle, with mature males sometimes displaying slightly longer dorsal fin filaments and a marginally larger body size compared to females.

Aquarium Setup: Requires a mature marine aquarium of at least 200 liters (approx. 50 gallons). The most critical component of the setup is a deep, fine sand bed of at least 5 to 8 centimeters. Coarse substrate or crushed coral must be avoided to prevent damage to their delicate gills. All rockwork must be secured directly onto the bottom glass pane to prevent collapses caused by the goby's constant excavation under the rocks. A tight-fitting lid or screen mesh is mandatory, as this species is an active jumper when startled.

Diet and Feeding: A carnivorous species that feeds on microfauna, small crustaceans, and worms residing in the sand. In captivity, they must be fed multiple times per day with high-quality frozen foods such as mysis shrimp, brine shrimp, finely chopped krill, and fresh seafood preparations. They can eventually be trained to accept sinking pellets, but a continuous supply of meaty food is required to prevent malnutrition.

Water Quality: Like all delicate reef fish, they demand stable marine water parameters. Keep the water temperature between 22°C and 26°C, pH between 8.1 and 8.4, specific gravity between 1.023 and 1.025, and carbonate hardness (KH) at 8-12 dKH. Nitrates and phosphates should be kept close to zero through efficient protein skimming, regular water changes, and proper mechanical filtration.

Compatibility and Cohabitation: Excellent candidates for reef aquariums (100% reef-safe). They are peaceful toward other non-aggressive marine fish such as clownfish, tangs, anthias, and small wrasses. Avoid keeping them with aggressive predators, highly territorial bottom-dwellers, or other sand-sifting species that might outcompete them for food or initiate territorial disputes.

Aquarium Breeding: Breeding in home aquariums is highly challenging and rarely successful. A compatible pair will excavate a burrow beneath a rock where the female deposits adhesive eggs on the ceiling. Both parents guard and fan the nest. Once hatched, the fry enter a pelagic stage and are extremely difficult to raise, requiring specialized live diets such as rotifers and copepods.

Risks and Diseases: The primary risk is starvation, especially when introduced to newly established aquariums lacking a rich microfauna population. Jumping is another common cause of mortality, requiring a secure enclosure. They are susceptible to typical marine external parasites like Marine Ich (Cryptocaryon irritans) and Velvet (Oodinium), which must be treated with copper-based medications in a separate quarantine tank.