Which of the following is a feature of a bony fish?

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Feature Class Chondrichthyes Class Osteicthyes Common name Cartilagenous fishes Bony fishes Endoskeleton Cartilaginous Bony Habitat Mostly marine Both marine and fresh water Gills and gill-cover Usually 5–7 pairs of gills without operculum (gill cover) 4 pairs of gills covered by operculum Types of scales Placoid scales present Usually cycloid or ctenoid scales present Air or swim bladder Absent Present

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Doubts & Discussion

Feature	Class Chondrichthyes	Class Osteicthyes
Common name	Cartilagenous fishes	Bony fishes
Endoskeleton	Cartilaginous	Bony
Habitat	Mostly marine	Both marine and fresh water
Gills and gill-cover	Usually 5–7 pairs of gills without operculum (gill cover)	4 pairs of gills covered by operculum
Types of scales	Placoid scales present	Usually cycloid or ctenoid scales present
Air or swim bladder	Absent	Present