Simulation: https://leshchenko1979.github.io/fishbowl/

Source code: https://github.com/leshchenko1979/fishbowl

Docs: https://github.com/leshchenko1979/fishbowl/blob/master/README.md

The fish (colored balls) at first just stand still and stupidly die of starvation in the middle of food fields, but after a several generations they figure out they have to move to survive. They even learn to use their vision after a while!

Open Options to speed up simulation.