Brachygobius aggregatus — Philippine Bumblebee Goby

Overview

A very small species (1.5–2 cm) from the Philippines and lower Mekong. Lacks a black head band, and the first body band may just touch the posterior margin of the eye. Frequently traded under misapplied names.

Appearance

Shared with the species: Bumblebee Goby

The body is small and compact, reaching up to 3–4 cm. The colouration consists of alternating vivid yellow and black transverse bands — typically four black bands on a yellow background — closely resembling a bumblebee. The belly is paler. Males are noticeably slimmer when viewed from above, while females are broader and plumper, particularly when gravid. The pelvic fins are fused into a small suctorial disc. The anal fin is entirely black, which is a useful identification feature.

Care

Shared with the species: Bumblebee Goby

Bumblebee gobies require slightly brackish water for long-term health, with a specific gravity of 1.005–1.008 (approximately 6–10 g/L of marine salt). Maintaining them in fully freshwater conditions leads to immune suppression and a shortened lifespan. A minimum aquarium of 40–60 litres is recommended, furnished with caves (clay pots, PVC pipes, coconut shells) and tolerant plants like Java fern or Java moss. Use a gentle sponge filter to avoid strong currents. Temperature 22–28 °C, pH 7.5–8.5. Regular partial water changes with appropriately mixed brackish water are essential.

Feeding

Shared with the species: Bumblebee Goby

Bumblebee gobies are strictly carnivorous and typically refuse prepared or dried foods. The primary diet must consist of live or frozen bloodworms, live brine shrimp, live blackworms, and small crustaceans. Transitioning individuals from live to frozen foods requires considerable patience, and some individuals may never accept non-living food. Feeding live foods exclusively is entirely acceptable for the long-term health of the fish. Flake and pellet foods should not be expected.

Compatibility

Shared with the species: Bumblebee Goby

Best kept as a species-only setup or with carefully chosen brackish-tolerant tankmates. Males are territorial and display aggression toward one another, so ample caves must be provided to reduce conflict. Suitable companions in a brackish aquarium include Mollies, and in larger setups, other small brackish gobies or Archerfish. Freshwater species cannot tolerate the salinity required by bumblebee gobies and should not be mixed.

Breeding

Shared with the species: Bumblebee Goby

Breeding is achievable in captivity and is one of the highlights of keeping this species. Males become more intensely coloured during courtship and aggressively defend a chosen cave. The female deposits 150–200 eggs inside the cave, which the male guards and fans. Eggs hatch after approximately 7 days; fry become free-swimming 5–7 days later. First foods for fry include infusoria, baby brine shrimp nauplii, and vinegar eels. Males are identified by their slimmer build and brighter colours; females develop a visible ovipositor just before spawning.

Fun facts

Shared with the species: Bumblebee Goby

Bumblebee gobies require brackish water for long-term health — purely freshwater keeping causes immune suppression and a shortened lifespan. The name 'Brachygobius xanthozonus' has been widely misapplied in aquarium literature for decades; most traded specimens are actually B. doriae or related species. Males become significantly more intensely coloured and boldly patterned during the breeding season.