ik the fish evolve new swimming styles and new textures but at a moment look weird because there are 2 completely different and they are from the same specie. I have a idea , when in the specie appear a mutation that make them to change color or grow a another fin or leg they will make a new species .there will be very much species and a diversity but near the map there are species names and i think too much names there will lag so idk if is good idea