. Ask *any* fish
hobbyist. they'll tell you.
The moment you put that damn net in that blasted tank... thinking you'll sneak up on the bloody little bastard who's so fast *this* time... but you can't get him. He KNOWS you're after him.
If they're schooling fish, the REST of the school goes one way. the one you want, under a rock. in the middle of the school, the wrong way, jump dodge twist and hide.
You'll only catch the ones you don't want.
The moment you want a different one, though, you'll catch him you chased at first. But the new one? Give up now--it's easier.