Haha, I do think you figured out the optimal strategy with the current way the fish combine! Adding some rare fish and making the fishing minigame not fill up with junk as quickly would make for a fun decision of 'how much do you want to push your luck to wait for a specific fish'.
I'm glad that you appreciated the fish names! I had a lot of fun seeing what weird results I could get while I was testing the combining system. I think one of my favorites was 'Jellynow', from the Jellyfish and the Minnow.
Thank you for the kind words!