Mudskipper Care Guide: Periophthalmus Species Semi-Terrestrial Brackish Fish
Few aquarium fish blur the line between aquatic and terrestrial quite like mudskippers. A proper mudskipper care guide must address what most generic resources overlook: these fish spend the majority of their time out of water. At Gensou Aquascaping, 5 Everton Park, Singapore, we have kept Periophthalmus barbarus and Periophthalmus argentilineatus for years and can confirm they are among the most entertaining brackish species available to hobbyists here. Getting their setup right, however, demands a fundamentally different approach from conventional fishkeeping.
Understanding Mudskipper Species
The genus Periophthalmus contains over a dozen species, but two dominate the hobby. Periophthalmus barbarus, the Atlantic mudskipper, reaches around 15 cm and thrives in moderate brackish conditions. The silver-lined mudskipper, Periophthalmus argentilineatus, stays slightly smaller at 10-12 cm and is commonly collected from Southeast Asian mangrove flats. Both species possess modified pectoral fins that function as rudimentary limbs and specially adapted eyes that see clearly in both air and water.
Tank Design: More Land Than Water
Forget the standard aquarium layout. Mudskippers need a paludarium with at least 60% land area and 40% shallow water. A 90 x 45 x 45 cm tank suits a pair comfortably. Slope the substrate from a deep water section of about 10-12 cm at one end to a dry mud bank at the other. Use a mix of fine sand and aquarium soil to create the land portion, planting mangrove propagules or Rhizophora seedlings if you want an authentic look.
A tight-fitting lid is non-negotiable. Mudskippers are exceptional climbers and will escape through any gap wider than a few millimetres. Maintain high humidity — 75-90% — inside the tank by keeping the land area damp and ensuring the lid traps moist air. Singapore’s ambient humidity helps enormously with this.
Brackish Water Parameters
Target a specific gravity of 1.005-1.015 using marine salt mix. PUB tap water works well as a base after dechlorination, though its softness means you should monitor KH and supplement with crushed coral if it drops below 5 dKH. Maintain the water temperature between 26 and 30°C — rarely a problem in our climate without air-conditioning. Weekly partial water changes of 20-30% keep nitrates manageable, and always pre-mix your replacement water to match the salinity before adding it.
Feeding Mudskippers
Wild mudskippers feed on insects, small crabs and worms across mudflats. In captivity, offer a varied diet of live or frozen bloodworms, brine shrimp, small crickets and flightless fruit flies. Many keepers find that hand-feeding develops quickly — these fish recognise their owners within weeks. Feed once or twice daily, placing food on the land portion as well as in the water. Avoid flake food entirely; mudskippers rarely accept it and the uneaten flakes foul the shallow water rapidly.
Territorial Behaviour and Tankmates
Male mudskippers are fiercely territorial. Each individual claims a mud burrow and defends it aggressively, raising its dorsal fin in threat displays. Keep only one male per tank unless the enclosure exceeds 120 cm in length with distinct territory boundaries created by rocks or driftwood. Females are less combative but still establish pecking orders. Suitable tankmates are limited to hardy brackish fish that stay in the water zone — small Poecilia mollies or Neritina snails work well and avoid the land areas mudskippers patrol.
Lighting and Heating
Provide a basking spot using a low-wattage LED or clip-on lamp positioned above the land section. Mudskippers bask to thermoregulate, and a warm spot of 32-34°C encourages natural behaviour. A standard day-night cycle of 10-12 hours works well. In Singapore, you generally will not need a water heater, but a small submersible unit set to 27°C acts as insurance during prolonged air-conditioned periods.
Common Health Issues
Skin infections from poor water quality are the most frequent problem. Because mudskippers sit in shallow, stagnant water and moist substrate, bacterial counts can spike quickly. Siphon detritus from the water section every few days, not just during weekly changes. Fungal patches on the skin typically respond to a short salt bath at 1.020 specific gravity for 10-15 minutes. Avoid copper-based medications — brackish species are often sensitive to them.
Where to Source Mudskippers in Singapore
Local fish shops in the Serangoon North area occasionally stock Periophthalmus species, and Carousell listings appear regularly from hobbyists downsizing. Expect to pay $8-15 per fish depending on species and size. Before purchasing, check that the mudskipper is alert, climbing actively and has no cloudy patches on its skin. A healthy mudskipper should react immediately to movement outside the tank, often following your finger with its prominent eyes. With the right mudskipper care guide in hand and a well-designed paludarium, these remarkable fish reward you with behaviour unlike anything else in the hobby.
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emilynakatani
Still Have Questions About Your Tank?
Drop by Gensou Aquascaping — most walk-in questions get answered in under 10 minutes by someone who has set up hundreds of tanks.
5 Everton Park #01-34B, Singapore 080005 · Open daily 11am – 8pm
