How to Identify Gould's Gudgeon

To identify Gould's Gudgeon (Hypseleotris Gouldii), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Generally silvery-grey to brownish on the dorsal surface, fading to a lighter, often whitish, ventral side. Males in breeding condition can display more intense coloration, including reddish or orange hues on the fins and body, and sometimes iridescent spots. A faint lateral stripe may be present. Fins are typically translucent, sometimes with dusky margins.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Relatively large eyes positioned dorsally on the head., Two distinct dorsal fins, the first with spines and the second with soft rays., Slightly compressed body laterally., Maximum recorded standard length up to approximately 60 mm, though typically smaller, around 30-45 mm.

Dorsal fin

Two dorsal fins; D1: VI-VIII spines; D2: I spine, 7-9 soft rays. The first dorsal fin is typically shorter than the second.

Tail fin

Caudal fin is rounded to slightly emarginate.

Pectoral fin

Pectoral fins are relatively large and rounded, with 13-16 rays.

Distinctive fins

Pelvic fins are separate, not fused into a sucking disc, originating below or slightly anterior to the pectoral fin base. Anal fin: I spine, 7-9 soft rays.

Identification Tips

1. 1

   Body Shape and Size

   Look for a small, slender fish, typically under 6 cm in length, with a slightly compressed body.

2. 2

   Dorsal Fins

   Observe the two distinct dorsal fins; the first is spiny and shorter than the soft-rayed second dorsal fin.

3. 3

   Eyes

   Note the relatively large eyes positioned towards the top of the head.

4. 4

   Pelvic Fins

   Confirm that the pelvic fins are separate and not fused, which distinguishes it from many other gudgeon species.

5. 5

   Coloration

   While variable, look for silvery-grey to brownish overall coloration, potentially with subtle lateral markings or breeding colors in males.

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