How to Identify Miiuy Croaker

To identify Miiuy Croaker (Miichthys miiuy), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Dorsal side is typically grayish-brown to yellowish-brown, fading to silvery-white on the ventral side. Fins are often dusky or yellowish. Juveniles may exhibit faint vertical bands that fade with age.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Relatively large head, approximately 28-33% of standard length., Large mouth, slightly oblique, with the posterior end extending to or slightly beyond the posterior margin of the eye., A pair of small, short barbels on the chin, which can be difficult to observe in some specimens., Lateral line scales number around 50-55., Strongly ctenoid scales covering the body and head, except for the snout and chin.

Dorsal fin

Two dorsal fins; the first dorsal fin has 9-10 spines, and the second dorsal fin has 1 spine and 27-32 soft rays. The two fins are distinctly separated.

Tail fin

Caudal fin is rhomboid or slightly S-shaped, not deeply forked.

Pectoral fin

Pectoral fins are relatively long, reaching beyond the tip of the pelvic fins.

Distinctive fins

Anal fin with 2 spines and 7-8 soft rays. Pelvic fins are thoracic, with 1 spine and 5 soft rays.

Identification Tips

1. 1

   Body Shape and Coloration

   Look for an elongated, somewhat compressed body, grayish-brown dorsally and silvery-white ventrally. Faint bands may be present in younger individuals.

2. 2

   Head and Mouth

   Note the relatively large head and large, slightly oblique mouth extending to or past the eye. The presence of small chin barbels is a key, though sometimes subtle, feature.

3. 3

   Dorsal Fins

   Observe the two distinctly separated dorsal fins: a spiny first dorsal and a longer, soft-rayed second dorsal.

4. 4

   Caudal Fin

   The caudal fin is rhomboid or slightly S-shaped, not deeply forked, which helps distinguish it from some other croaker species.

5. 5

   Lateral Line

   The lateral line is prominent and curves slightly upwards anteriorly.

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