cartilage fishes

Are There Any Fish That Do Not Have Operculum?

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Are There Any Fish That Do Not Have Operculum? Sharks, rays and relatives such as elasmobranch fishes lack the opercular series. They instead respire through a series of gill slits that perforate the body wall. Without the operculum bone, other methods of getting water to the gills are required, such as ram ventilation, as used

Do Cartilaginous Fish Have Swim Bladders?

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Do Cartilaginous Fish Have Swim Bladders? Do cartilaginous fish have swim bladders? The swim bladder is missing in some bottom-dwelling and deep-sea bony fish (teleosts) and in all cartilaginous fish (sharks, skates, and rays). Do cartilaginous have swim bladders? Unlike bony fish, the cartilaginous fish do not have a swim bladder, so must move continuously