Billions if not trillions.
the amount of fish are always changing and there is no certain answer.
tides
parrot fish live in tropical waters
way to much to count
many things lie beneath the ocean waters including sand, fish, sharks,dolphins,whales etc. there are many undiscovered species in the waters. nobody can be sure exactly what but i think it is this :) under that is some rock that gets hotter as you venture deeper until you get through the earths crust.
The Scorpion or Dragon fish in tropical waters, many species, deadly & the Bullhead, Miller's Thumb or Father Lasher in northern European waters, not so deadly but painful if you tread on one.
sea fish.
There are about 40 different species native to various tropical waters
A Garibaldi is a fish. This Fish is seen in the Coastal Waters in California.
This source is ocean waters.
goldfish
aquartic