The operculum is a series of bones found in bony fish and chimaeras that serves as a facial support structure and a protective covering for the gills;...

some birds Operculum (bryozoa), a lid on the orifice of some bryozoans Operculum (fish), a flap covering the gills of bony fish Operculum (gastropod)...

branchial pouches. Fish gill respiration Fish gill structure In bony fish, the gills lie in a branchial chamber covered by a bony operculum (branchia is an...

operculum lies on the top rear part of the foot. When the foot is retracted, the operculum is rotated 180° and closes the shell. An operculum (fish)...

protective bony cover or operculum. They are able to oxygenate their gills using muscles in the head. Some 400 species of fish in 50 families can breathe...

Common names of fish can refer to a single species; to an entire group of species, such as a genus or family; or to multiple unrelated species or groups...

Shoaling and schooling In biology, any group of fish that stay together for social reasons are shoaling, and if the group is swimming in the same direction...

Juvenile fish Fish go through various life stages between fertilization and adulthood. The life of fish start as spawned eggs which hatch into immotile...

Fish reproductive organs include testes and ovaries. In most species, gonads are paired organs of similar size, which can be partially or totally fused...

gills protected by an operculum, and a mouth at or near the tip of the snout. The dermis is covered with overlapping scales. Bony fish have a swim bladder...