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.
as soon as I saw "competitive fishing" in the title, I thought of this video and hoped someone would post it
Iirc, that dude had been on a winning streak, which is why this was a Big Fucking Deal to all the onlookers in the video.