How to Identify Japanese Threadfin Bream

To identify Japanese Threadfin Bream (Nemipterus japonicus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Body silvery-pink to reddish dorsally, fading to silvery-white ventrally. Often with indistinct yellowish longitudinal stripes along the flanks. A prominent red or yellow blotch may be present on the upper part of the operculum. Fins are typically yellowish or pinkish, with the caudal fin often having a reddish or yellowish tinge, and the prolonged upper ray being yellow.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Elongated upper caudal fin ray, often yellow., Large eyes., Slightly forked caudal fin., Absence of scales on the preoperculum and interorbital space., A small, conical tooth at the posterior end of the upper jaw.

Dorsal fin

Single dorsal fin with X spines and 9 soft rays. The spines gradually increase in length posteriorly.

Tail fin

Forked caudal fin, with the upper lobe significantly prolonged into a yellow filament.

Pectoral fin

Long and pointed, reaching beyond the anus.

Distinctive fins

The prolonged upper caudal fin ray is a key distinguishing feature.

Identification Tips

1. 1

   Caudal Fin

   Look for the distinctly prolonged, yellow upper ray of the caudal fin. This is a primary identifier.

2. 2

   Body Coloration

   Observe the silvery-pink to reddish dorsal coloration fading to white, often with faint yellowish stripes.

3. 3

   Dorsal Fin

   Count the dorsal fin spines (X) and soft rays (9). The spines increase in length posteriorly.

4. 4

   Pectoral Fins

   Note the long, pointed pectoral fins that extend past the anus.

Explore Japanese Threadfin Bream