Blue-spotted Mudskipper

Boleophthalmus boddarti is unique among mudskippers in being primarily herbivorous, using its comb-like teeth to graze algae and diatoms from exposed mudflat surfaces at low tide. Distributed from the Persian Gulf and Indian subcontinent through Southeast Asia to southern China, it is a strikingly beautiful species: the body is deep grey-blue to olive-green densely covered with vivid electric-blue iridescent spots that glow brilliantly in sunlight. The high first dorsal fin bears a series of blue spots and is prominently displayed during territorial interactions. Unlike the predatory Periophthalmus, Boleophthalmus spends even more time out of water and is a more dedicated algae grazer. In the paludarium, it requires a damp algae-encrusted mudflat area, brackish water, and high humidity. Males are territorial on the surface but less prone to physical combat than Periophthalmus.

Water: 24–30 °C, pH 7.5–8.5, GH 10–25, KH 5–15; brackish (SG 1.005–1.015); mud or fine sand substrate with algae. Tank: 120 L minimum paludarium; damp algae-covered mudflat area; mangrove roots; very high humidity essential. Feeding: Herbivore/aufwuchs; algae wafers, spirulina flakes, blanched spinach; will also take small invertebrates occasionally. Breeding: Burrow spawner with air pocket; breeding rarely achieved; male guards eggs. Compatibility: Territorial with conspecifics; can be housed with other brackish species in water section.