So, I've decided to not look into this at all, but my understanding is that you're scored by like, size and weight of the best fish or added up fish total by the end of some fishing time limit. So like...isn't this mostly up to the fish? This meta feels VERY rng driven and hardly suitable to competitive play. 
, but it came to kind and I'm curious how the fuck anyone gets credit here. If anything it should be whoever can catch any fish first.
i don't fish and couldn't imagine being invested in it as a competition, but i think the notion is that bigger fish are older and have more guile from being longer lived.
personally, i don't need an excuse or an invitation to sit on the side of a waterbody and zone out.