How to Identify Kaudern's Cardinalfish

To identify Kaudern's Cardinalfish (Pterapogon kauderni), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Silver-grey body with distinct black vertical stripes and white spots. The fins are also marked with black and white patterns.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Three prominent black vertical bars on the body, with a fourth on the caudal peduncle., Numerous small, iridescent white spots scattered over the body and fins., Elongated, deeply forked caudal fin., Two distinct dorsal fins, the first being spiny and the second soft-rayed., Large eyes, typical of nocturnal or crepuscular fish.

Dorsal fin

Two dorsal fins: D1 VIII (8 spines); D2 I, 14 (1 spine, 14 soft rays). The first dorsal fin is tall and spiny, the second is softer and more rounded.

Tail fin

Deeply forked caudal fin, often with elongated filaments on the upper and lower lobes.

Pectoral fin

Pectoral fins are relatively large and fan-shaped, typically with 13-14 rays.

Distinctive fins

Pelvic fins are long and pointed, often reaching past the anal fin origin. Anal fin is I, 13-14 (1 spine, 13-14 soft rays).

Identification Tips

1. 1

   Body Pattern

   Look for the distinctive pattern of three black vertical bars on a silver-grey body, complemented by numerous small white spots. This pattern is unique among cardinalfish.

2. 2

   Fin Shape

   The deeply forked caudal fin with elongated filaments and the tall, spiny first dorsal fin are key identifiers.

3. 3

   Habitat Association

   In its natural range, its strong association with Diadema sea urchins or branching corals is a strong indicator.

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