For zoology Why do the osteichthyian fish have fewer gills t
For zoology:
 Why do the osteichthyian fish have fewer gills than the chondrycthian fish? I think it\'s because the osteichthyes have a swim bladder?
 For zoology:
 Why do the osteichthyian fish have fewer gills than the chondrycthian fish? I think it\'s because the osteichthyes have a swim bladder?
 For zoology:
 I think it\'s because the osteichthyes have a swim bladder?
Solution
Osteichthyes or bony fish have 4 pairs of gills. Gills of bony fishes are covered by operculum.
Chondrichthyes or cartilaginous fish have 5-6 pairs of gills. Gilles of cartilaginous fishes are exposed to outside.

