How to Identify Blue-spotted mudskipper

To identify Blue-spotted mudskipper (Boleophthalmus boddarti), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Dorsal surface typically dark brown to olive-green, fading to a lighter ventral side. Distinctive iridescent blue spots are scattered across the body, head, and fins, particularly prominent on the flanks. The first dorsal fin often has a dark margin and a series of white or light spots.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Large, protruding eyes located dorsally on the head, capable of independent movement., Robust, muscular pectoral fins modified for terrestrial locomotion (walking and 'crutching')., Two distinct dorsal fins; the first is typically taller and more triangular., Small, cycloid scales embedded in the skin, giving a smooth appearance., A prominent gular fold (throat sac) that can be inflated to store water for cutaneous respiration.

Dorsal fin

Two dorsal fins. The first dorsal fin (D1) has V-XV (typically X-XIV) spines, often with a dark margin and light spots. The second dorsal fin (D2) has I spine and 24-28 soft rays, typically lower and longer than D1.

Tail fin

Rounded to slightly emarginate caudal fin, often with dark bands or spots.

Pectoral fin

Large, muscular, and fleshy, with a broad base, used for terrestrial locomotion. Typically 18-20 rays.

Distinctive fins

Pelvic fins are fused into a disc-like structure, aiding in adhesion to surfaces and providing support on land.

Identification Tips

1. 1

   Coloration and Spots

   Look for the characteristic iridescent blue spots on the body and fins, which are a key identifier for this species.

2. 2

   Dorsal Fins

   Observe the two distinct dorsal fins. The first dorsal fin is typically taller and more triangular, often with a dark margin and light spots, distinguishing it from some other mudskipper species.

3. 3

   Pectoral Fins

   Note the robust, muscular pectoral fins used for 'walking' on land, a common feature among mudskippers but particularly well-developed in Boleophthalmus species.

4. 4

   Eye Position

   The large, dorsally-placed, independently movable eyes are a hallmark of mudskippers and aid in spotting prey and predators on land.

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