By far the largest number of extant fish species on Earth have

Question

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The presence of an operculum (bony covering over the gills) and swim bladder is a characteristic of bony fish (Osteichthyes), which make up the vast majority of fish species on Earth. Cartilaginous fish (Chondrichthyes), which have a cartilaginous skeleton, only make up a small percentage of fish species. Fish with rasping tongues for parasitic behavior and high economic importance for their skin are not significant characteristics for the majority of fish species.

By Far the Largest Number of Extant Fish Species on Earth