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.

 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 zoolog

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