The Fascinating World of Brackish Mudskippers: Nature’s Amphibious Oddballs

Mudskippers are among the most unusual fish on the planet—creatures that don’t just survive out of water, but thrive there. Found across tropical and subtropical mangrove swamps, estuaries, and muddy shorelines, these amphibious gobies have evolved remarkable adaptations that allow them to walk, climb, dig, and even breathe air. 

Where Mudskippers Live

Mudskippers inhabit inter-tidal zones—areas that are underwater at high tide and exposed at low tide. These shifting environments demand flexibility, and mudskippers have mastered the art of living between worlds. They are most commonly found in:

Mangrove forests

Mudflats

Estuaries

Brackish lagoons

Species within the genera Periophthalmus, Periophthalmodon, Boleophthalmus, and Scartelaos are considered true mudskippers. 

Unique Adaptations: Built for Land and Water

Mudskippers are not your typical fish. Their bodies are engineered for amphibious life:

Prominent, rotating eyes perched on top of their head give them panoramic vision. 

Muscular pectoral fins act like limbs, allowing them to “walk” or hop across mud.

Modified gill chambers trap air bubbles, enabling them to breathe on land. 

Cutaneous respiration (breathing through skin and mouth lining) works as long as they stay moist.

Burrowing behaviour helps regulate temperature and avoid predators.

These adaptations make mudskippers one of the few fish capable of extended terrestrial activity.

Diet and Ecological Role

Mudskippers are omnivores with a varied diet:

Small crabs and insects

Worms

Algae

Detritus

Their burrowing helps aerate mud, improving nutrient cycling in mangrove ecosystems. They also serve as prey for birds and reptiles, making them a vital link in coastal food webs. 

Behaviour: Small Fish, Big Personality

Mudskippers are surprisingly expressive. They display territorial behaviours, raise their dorsal fins in dominance displays, and even perform courtship dances. Some species can leap up to 60cm using their tails. 

They spend much of their day basking on mudbanks, defending burrows, or foraging across exposed flats.

Keeping Mudskippers in a Home Aquarium

Mudskippers are popular in the aquatics trade, but they require specialised care. A proper setup resembles a paludarium more than a standard aquarium.

Key requirements:

Brackish water with a salinity around SG 1.005. 

Warm temperatures between 25–30°C.

High humidity above the waterline.

A large land area—ideally two‑thirds of the enclosure.

Soft sand substrate for burrowing.

Roots, rocks, and platforms for climbing and basking.

Mudskippers must have access to land; without it, they cannot thrive.

Example species: Atlantic Mudskipper

A common species, but quite hard to find on sale anywhere. Because of their size, it is advised to house them singly or in sexed pairs - they are very territorial fish! Mudskippers are swift jumpers, so take care when opening the aquarium lid for maintenance.

Scientific name: Periophthalmus barbarus
Origin: Western African coastline
Habitat: Mangrove swamps
Size: Around 15cm full grown
Recommended tanks size: 120 x 30cm medium (300L)
Water requirements: Brackish, SG 1.005 - 1015, hard water, 7.5 to 8.5 pH
Estimated cost at shops: £40-60 each.

Conservation and Threats

While many mudskipper species are listed as Least Concern, their habitats—mangroves and estuaries—are among the most threatened ecosystems on Earth. Coastal development, pollution, and mangrove destruction pose significant risks. 

Protecting these environments is essential not only for mudskippers but for countless species that depend on them.

Final Thoughts

Brackish mudskippers are living proof that evolution has a sense of creativity. Their amphibious lifestyle, quirky behaviour, and ecological importance make them a captivating subject for aquarists, nature lovers, and bloggers alike. Whether you’re fascinated by their biology or considering keeping them at home, mudskippers offer endless intrigue.

To find out more about Brackish species and topics please click here.

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Photo credit(s): Shutterstock

Related keyword searches: Brackish, Brackish Fish, Goby, Gobies.