the amount of fish are always changing and there is no certain answer.
Billions if not trillions.
Fish swimming in waters around Antarctica -- which is liquid -- enjoy water temperatures that are above freezing. Cold water on earth is home to many fish which thrive in cooler water.
parrot fish live in tropical waters
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
There are over 200,000 puffer fish
A Garibaldi is a fish. This Fish is seen in the Coastal Waters in California.
goldfish
aquartic
cold
AnswerOf course! Many fish such as salmon (bears common meal), cod, flatfish, and trout! These fish are specially adapted to the freezing waters and weather of the Tundra!