Weeverfish (Trachinus & Echiichthys)

FishVenomousCoastalMarine

Overview

Weeverfish (family Trachinidae) are small, elongated coastal fish of the eastern Atlantic, Mediterranean, Black, and North Seas. The best known are the greater weever (Trachinus draco) and the lesser weever (Echiichthys vipera). They spend much of their time buried in sand on shallow seabeds, with just the eyes and the tip of a spiny fin exposed.

Weevers are venomous. They carry sharp spines — in the first dorsal fin and on the gill covers — that are equipped with venom, and they are widely regarded as among the most venomous fish in temperate European seas. The venom is a defence, not a hunting tool.

Safety note: weeverfish stings are very painful. Because the fish lies hidden in shallow sand, people are most often stung by stepping on one in the shallows or handling a caught fish. Do not handle weeverfish, take care wading on sandy shores where they occur, and seek professional medical advice or attention if stung. This page is educational and does not provide first-aid or medical treatment instructions.

Habitat & Range

Weeverfish live on sandy and muddy seabeds, mostly in shallow coastal waters but ranging into deeper water. The lesser weever in particular favours shallow sandy areas close to shore, including the zone where people swim and wade. They lie buried in the sediment during the day and may be more active at night.

Diet

Weeverfish are ambush predators. Buried in the sand with only the eyes and mouth area exposed, they wait for small fish, shrimps, and other crustaceans to pass within reach, then dart out to seize them. Their venomous spines are used for defence against larger predators, not for catching this prey.

Behavior

The weever's whole lifestyle is built around concealment. By burying itself it stays hidden from both prey and predators, and its upward-facing eyes and mouth let it watch and strike from below the surface. If a predator — or a foot — disturbs it, the erect, venom-bearing spines provide a powerful deterrent. Weevers are not aggressive and do not chase people; stings are a defensive response to being trodden on or handled.

Human Interaction & Conservation

Weeverfish matter to people mainly as a coastal hazard and, in some areas, as a food fish caught by anglers and in trawls. Most stings happen by accident — stepping on a buried lesser weever in shallow water, or handling a fish when removing it from a net or line. If stung, seek professional medical advice or attention. The safest approach is prevention: avoid touching weeverfish and take care when wading on sandy shores where they are known to occur.

More photos of the weeverfish