How to Identify Southern Purple Spotted Gudgeon

To identify Southern Purple Spotted Gudgeon (Mogurnda adspersa), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Variable, typically a mottled brown to olive-green base color with numerous iridescent purple, blue, or reddish spots and blotches across the body and fins. Males often display more intense coloration, especially during breeding. The belly is usually lighter.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Robust, somewhat compressed body, Large head with a relatively large mouth, Two distinct dorsal fins, Prominent, often iridescent, purple or blue spots on body and fins

Dorsal fin

Two dorsal fins; the first is spiny, the second is soft-rayed and longer. They are typically separated or narrowly joined.

Tail fin

Rounded to slightly truncate caudal fin.

Pectoral fin

Large, rounded pectoral fins.

Distinctive fins

Pelvic fins are thoracic, located beneath the pectoral fins, and are often fused or closely set.

Identification Tips

1. 1

   Coloration and Spotting

   Look for the distinctive purple, blue, or reddish spots on a mottled brown/olive background. The intensity of these spots is a key identifier.

2. 2

   Body Shape

   Its robust, somewhat stocky body and large head are characteristic.

3. 3

   Dorsal Fins

   The presence of two distinct dorsal fins, with the first being spiny, helps differentiate it from some other small native fish.

4. 4

   Mouth Size

   A relatively large mouth indicates its predatory nature.

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