How to Identify Blacktail

To identify Blacktail (Diplodus capensis), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Silvery-grey body, often with a yellowish tinge on the flanks. The most prominent feature is a distinct, large, black spot on the caudal peduncle, extending onto the base of the caudal fin. Juveniles may have faint vertical bars on their flanks that fade with age.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Large, prominent black spot on the caudal peduncle and caudal fin base., Small, protractile mouth with incisor-like teeth in the front and molar-like teeth at the sides., Deep, compressed body.

Dorsal fin

Single dorsal fin with 11-12 strong spines and 12-15 soft rays. The spiny portion is longer than the soft-rayed portion.

Tail fin

Moderately forked caudal fin, with the distinctive black spot covering its base.

Pectoral fin

Long and pointed pectoral fins.

Distinctive fins

Anal fin with 3 spines and 11-13 soft rays. Pelvic fins are thoracic.

Identification Tips

1. 1

   Caudal Spot

   The most definitive identification feature is the large, distinct black spot on the caudal peduncle and the base of the caudal fin. This spot is present at all life stages.

2. 2

   Body Shape and Color

   Look for a deep, compressed, silvery-grey body. Juveniles might show faint vertical bars, but the black caudal spot remains constant.

3. 3

   Mouth and Teeth

   Observe the small, slightly protractile mouth with a combination of incisor-like and molar-like teeth, indicative of its omnivorous diet.

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