What kind of fish make up the majority of fish species?

Bony fishes!!! Bony fishes are what people generally think of as "fish." Trout are just a type of bony fish. There are less types of cartilaginous fish (fish like sharks and rays) and jawless fish (primitive fish like sea lampreys and hagfish).

Hope this helps

Ithink due to shortage of water

All of them are man made