How to Identify Giant kokopu

To identify Giant kokopu (Galaxias argenteus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Adults typically exhibit a dark olive-green to brown background color, heavily mottled with irregular, large, pale cream to golden-yellow blotches and spots. The ventral surface is usually paler. Juveniles (whitebait) are translucent.

Scale type

none

Mouth position

terminal

Distinctive features

Robust, cylindrical body, particularly thick-set compared to other galaxiids., Large, irregular pale blotches and spots over a dark background., Absence of scales., Single dorsal fin positioned far back on the body, opposite the anal fin., Large mouth with a prominent lower jaw.

Dorsal fin

Single, short-based, located posteriorly, opposite the anal fin.

Tail fin

Slightly forked to truncate, robust.

Pectoral fin

Relatively small, positioned low on the body.

Distinctive fins

Pelvic fins are present and abdominal in position. Adipose fin is absent.

Identification Tips

1. 1

   Size

   Largest of the New Zealand galaxiids, reaching up to 58 cm in length, though typically 30-40 cm.

2. 2

   Coloration and Pattern

   Distinctive large, irregular pale blotches and spots on a dark background. This mottled pattern is key to distinguishing it from other kokopu species.

3. 3

   Body Shape

   Robust, thick-set, and cylindrical body, not as slender as some other galaxiids.

4. 4

   Absence of Scales

   Like all galaxiids, it lacks scales, having smooth, slimy skin.

5. 5

   Fin Position

   The single dorsal fin is located far back on the body, directly above the anal fin.

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