Spiny chromis

The Spiny chromis (Acanthochromis polyacanthus) is a tropical marine fish known for its distinctive spiny dorsal fin. Predominantly pale to dark brown or sometimes almost black, with some individuals displaying lighter patches or bands, the fish is native to the western Pacific Ocean, including the Great Barrier Reef. It is relatively small and robust, characterized by its lack of a lateral line system, a unique trait among damselfish. While recognizable for its specific appearance and habitat, Acanthochromis polyacanthus is not particularly well-known in the aquarium hobby, primarily due to its specific care requirements and less vibrant coloration compared to other popular aquarium fish.