Caffeine thought of the day... in which fish, is there the most difference, between males and female's???

[Magnum Man]

it's funny how some fish, even knowledgeable fish keepers, can't tell the difference in the sexes, then there are some fish, that look so different, they don't even look like the same species, endlers and guppies, a prime example, from my experience.... anyone want to list some you can't tell apart, or some so different, they look different species, and or discuss the evolutionary advantage to either???

these are a few of my Santa Maria Endlers, a prime example of extreme differences between males and females

and my Angel fish, for example, I have no idea of their sex...

 

[Back in the fold]

Guppies for sure as the one fish easiest to tell the sexes . Even someone who doesn’t know tropical fish can tell the difference . The hardest to differentiate is , to me , Angelfish . I’ve never been able to tell even when I thought I knew .