weever fish (Trachinus vipera )

weever fish (Trachinus vipera ) fish (found in sea off the south coast of England) whose dorsal spine causes a painful sting when trodden on; pain of the sting is reduced by immersing area in hot (~45°C) water, or by rubbing site with a potassium permanganate crystal; old sting sites may show haemosiderosis