触发鱼指的是如阿萨斯触发鱼（Rhinecanthus assasi）、黑色触发鱼（Odonus ni

ggerfish is a colourful, robust and very distinctive fish, characterised by its territoriality, swimming habits and impressive defence system, making it one of the iconic species of the Red Sea's coral reefs. It lives on sandy bottoms, coral reefs and in rocky areas up to 50 m deep. It is a territorial fish that can sometimes be aggressive towards intruders or divers approaching its nest. It swims using synchronised movements of its dorsal and anal fins, accelerating with its tail. It can emit growls or clicks to defend itself or intimidate others using its teeth or swim bladder. Its spine has a locking system reminiscent of a gun trigger, allowing it to wedge itself into crevices and resist extraction by predators. This also allows it to anchor itself securely while resting or facing currents. It benefits from cleaning by cleaner fish and shrimps, particularly the cleaner wrasse.