How to Identify Mudskipper

To identify Mudskipper (Periophthalmus sp.), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Highly variable depending on species and environment, typically mottled brown, grey, or olive with darker spots or bands, providing camouflage against mud and mangrove roots. Some species exhibit iridescent blue or green spots, especially during breeding.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Protruding, independently movable eyes located on top of the head, providing 360-degree vision above water., Strong, muscular pectoral fins modified into 'crutches' for terrestrial locomotion., Large, fused pelvic fins forming a suction cup-like structure, aiding in climbing and anchoring., Dorsal fins often prominent and colorful, used in display., Thick, vascularized skin for cutaneous respiration.

Dorsal fin

Typically two dorsal fins. The first dorsal fin is often tall and sail-like, with 6-17 spines, used for display. The second dorsal fin is lower and longer, with 9-14 soft rays.

Tail fin

Rounded or slightly emarginate caudal fin.

Pectoral fin

Large, muscular, and highly mobile, with a fleshy base, adapted for 'walking' on land.

Distinctive fins

Pelvic fins are fused into a disc or suction cup, located anteriorly, used for adhesion to surfaces and stability on land.

Identification Tips

1. 1

   Eyes

   Look for large, bulbous eyes positioned on top of the head, capable of independent movement.

2. 2

   Pectoral Fins

   Observe their strong, muscular pectoral fins which they use to 'walk' or 'skip' across the mud.

3. 3

   Habitat

   Mudskippers are almost exclusively found in intertidal mudflats and mangrove areas, often out of water.

4. 4

   Behavior

   Their terrestrial behavior, including burrowing, territorial displays, and foraging on land, is a key identifier.

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