One thing you might want to look at is time as well. If lake doesn't matter, as Pana mentioned, then the only two factors besides score is time and fish caught. Those two might be the basic scores looked at.
I'm so out of practice. I've let go at least half of my catches due to being out of practice, my internet hiccuping, and using a wireless mouse, making the response to my movements being just a little out of sync. Note to self, use a wired mouse when fishing. There's no way I'm even going to attempt Durem until I'm back in practice. Since I sucked there even when I was fishing hours a day.