sargassum fish
A marine fish of the family Antennariidae, often associated with floating sargassum seaweed.
The sargassum fish camouflages itself in drifting seaweed and preys on small fish.
The name 花虎魚 (はなおこぜ) is a compound of 花 (flower), 虎 (tiger), and 魚 (fish), likely referring to its ornate, flower-like appendages and fierce, tiger-like predatory behavior. The exact historical derivation is uncertain.