OSTEICHTHYES Description: Bony fish skeleton is made of bone, which is an important characteristic. Other structural feature in bony fish is a flap called the operculum (a flap on each side of the head that covers the gills). The movements of these flaps allow the fish to breathe without moving.Most bony fish are carnivorous, few are herbivores that feed on algae and aquatic plants, and some are filter feeders. Bony fish are all aquatic and majorities are marine (salt water) such as salmon, sea horse, blowfish, and sea bass. Gold fish, beta, rainbow trout are few examples of fresh water fish. Examples: 1. Hippocampus kuda - Spotted Seahorse 2. Oncorhynchus mykiss - Rainbow Trout