Communication (via talking and signalling) was probably the biggest step in human evolution, enabling us to work together to solve problems. If fish could talk and possibly develop opposable thumbs so they could hold things), I expect they would achieve domination of the oceans in a few million years. They would have to fight us to take over the land though!
too many people find fish tasty and there is too much over fishing going on for fish numbers to get large enough for fish armies 🙂 Plus they would have to make something to let them breath air.
You know what, probably not too long! Fish are amongst the oldest species on earth – they have been around for billions of years so they know how to survive and know their stuff.
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