After maintaining your simulation pool for only one year, you find a significant decline in the number of moderately colored guppies. The brightest males and drabbest males are still faring pretty ...

these peaceful fish get along perfectly with many other small fish of tranquil nature. Be cautious, though, as Endler’s livebearers will interbreed with guppies. Avoid keeping the two species ...

In a simulation or in the wild, where predators are plentiful, male guppies become increasingly drab over generations, pushed by predation pressure toward greater camouflage. So if camouflage ...