How to Identify Weever

To identify Weever (Trachinus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Generally sandy or yellowish-brown to olive-green on the dorsal side, often with darker blotches or stripes, fading to a lighter, silvery-white on the ventral side. Some species, like Trachinus radiatus, have distinct dark spots.

Scale type

cycloid

Mouth position

superior

Distinctive features

Two venomous spines on the operculum (gill cover), First dorsal fin with 5-7 venomous spines, Eyes positioned high on the head, pointing upwards, Protrusible mouth with small, sharp teeth, Laterally compressed body

Dorsal fin

Two dorsal fins: the first is short with 5-7 venomous spines, typically black; the second is long, extending almost to the caudal fin, with numerous soft rays.

Tail fin

Slightly emarginate or rounded caudal fin.

Pectoral fin

Well-developed pectoral fins.

Distinctive fins

Pelvic fins are jugular (located anterior to the pectoral fins).

Identification Tips

1. 1

   Venomous Spines

   Look for the distinct black first dorsal fin with 5-7 spines and two sharp, venomous spines on each gill cover. These are the primary identification features and safety hazards.

2. 2

   Eyes and Mouth

   The eyes are positioned high on the head, almost on top, and point upwards. The mouth is large and angled upwards, adapted for ambushing prey from below.

3. 3

   Body Shape and Coloration

   Elongated, somewhat compressed body with cryptic coloration (sandy, brownish, or olive) that allows them to blend into the seabed. Some species may have darker spots or stripes.

4. 4

   Behavior

   Often found buried in sand or mud, with only the eyes and the tip of the first dorsal fin visible. This behavior is a strong indicator of a weever fish.

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