Tropical FIsh are a mob coming to Minecraft in the 1.13 Aquatic Update.
There are over 3,000 different combinations of color, pattern, and size. All tropical fish drop the clownfish texture when killed.
In Minecraft Pocket Edition, whenever you pick up a tropical fish in a bucket it lists the type of fish. Due to this we now know the different types of tropical fish. (12 different body structures)
Some tropical fish swimming
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All tropical fish variants
(Note: None of these, except for Spotty, Stripey, and Kob, are actual species)