How to Identify Blotched croaker

To identify Blotched croaker (Nibea maculata), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Silvery-grey to brownish-grey dorsally, fading to silvery-white ventrally. Characterized by 5-7 irregular, dark, saddle-like blotches or large spots along the lateral line and upper flanks. Fins are generally dusky or yellowish.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

5-7 irregular dark blotches on the upper body, Large mouth with a slightly oblique gape, Presence of a mental barbel (though sometimes rudimentary or absent in adults), Strongly ctenoid scales on the body, cycloid on the head

Dorsal fin

Single dorsal fin deeply notched, with 10-11 spines followed by 1 spine and 26-30 soft rays. The spinous portion is higher than the soft-rayed portion.

Tail fin

Caudal fin rhomboid to S-shaped in adults, slightly pointed.

Pectoral fin

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

Distinctive fins

Anal fin with 2 spines and 7-8 soft rays. Pelvic fins thoracic.

Identification Tips

1. 1

   Body blotches

   Look for the characteristic 5-7 irregular, dark blotches or large spots along the upper flanks and lateral line. These are the most reliable distinguishing feature.

2. 2

   Mouth and chin

   Observe the large, slightly oblique mouth. Check for the presence of a small mental barbel on the chin, though it can be rudimentary or absent in larger individuals.

3. 3

   Caudal fin shape

   The caudal fin is typically rhomboid or slightly S-shaped, which can help differentiate it from other croaker species with more truncate or emarginate tails.

4. 4

   Lateral line

   The lateral line is prominent and curves gently upwards over the pectoral fin, then runs straight to the caudal fin base.

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