How to Identify Turquoise Rainbowfish

To identify Turquoise Rainbowfish (Melanotaenia lacustris), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Males exhibit brilliant turquoise to blue-green coloration, often with iridescent scales that shimmer under light. They may also display yellow or orange fins, particularly the anal and dorsal fins. Females are generally duller, with a more subdued silvery-blue or greenish hue. Color intensity can vary based on mood, health, and breeding condition.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Two distinct dorsal fins, with the first being smaller than the second., Deeply forked caudal fin., Large eyes relative to head size., Males develop a more pronounced nuchal hump and elongated fin rays as they mature.

Dorsal fin

Two dorsal fins; the first is small and spiny, the second is larger and soft-rayed, originating just behind the first.

Tail fin

Deeply forked, symmetrical caudal fin.

Pectoral fin

Small, clear, and positioned laterally.

Distinctive fins

Anal fin is long, extending from just behind the pelvic fins to near the caudal peduncle. Pelvic fins are small and located ventrally.

Identification Tips

1. 1

   Coloration

   Vibrant turquoise to blue-green body, especially in mature males. Females are less intensely colored.

2. 2

   Fin Structure

   Two dorsal fins, with the second being significantly larger. Deeply forked caudal fin.

3. 3

   Geographic Origin

   Naturally found only in Lake Kutubu, Papua New Guinea.

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