How to Identify Black Margate

To identify Black Margate (Anisotremus surinamensis), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Adults are typically dark grey to black dorsally, fading to a lighter grey or whitish belly. Juveniles often have more pronounced dark blotches or bars, sometimes with a yellowish tint. Fins are generally dark. A distinctive dark spot is often present at the base of the pectoral fin.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Robust, compressed body, Large, thick lips, Deeply notched dorsal fin, Dark spot at the base of the pectoral fin (often present), Can produce grunting sounds

Dorsal fin

Single dorsal fin, deeply notched, with 12-13 spines and 16-18 soft rays.

Tail fin

Caudal fin is emarginate (slightly forked) to truncate.

Pectoral fin

Pectoral fins are relatively long and pointed.

Distinctive fins

Anal fin with 3 strong spines and 8-9 soft rays. Pelvic fins thoracic.

Identification Tips

1. 1

   Coloration

   Look for the overall dark grey to black body, often with a lighter belly. Juveniles may have more distinct dark blotches.

2. 2

   Pectoral Fin Spot

   A prominent dark spot at the base of the pectoral fin is a key identifier, though it can be faint in some individuals.

3. 3

   Body Shape and Lips

   Its robust, compressed body and noticeably thick lips are characteristic.

4. 4

   Fin Count

   Counting dorsal fin spines (12-13) and soft rays (16-18), and anal fin spines (3) and soft rays (8-9) can confirm identification.

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