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.