I already wrote this as an e-mail, but perhaps it got stuck in a spam filter... Here others will be able to read it too, so it's better.
As a side note, I would never fish in real life, I eat no meat at all... but I enjoyed catching these pixel fishies in "A Short Hike" and I wanted to provide my feedback.
First: I kindly suggest to tidy up the fish journal so that the fish are in a more or less predetermined order. Particularly - a "special" fish always right after its "basic" variant. After my last time playing "A Short Hike", the order in my fish journal looks like this:
1. Common Carp, 2. Albino Common Carp, 3. Brook Trout, 4. Albino Brook Trout, 5. Rainbow Trout, 6. Actually Rainbow Trout, 7. Spotted Brook Trout, 8. Albino Spotted Brook Trout, 9. Catfish, 10. Pumpkinseed Fish, 11. Golden Catfish, 12. Albino Pumpkinseed Fish, 13. White Bass, 14. Pink White Bass, 15. Bluegill, 16. Crayfish, 17. White Perch, 18. Albino Bluegill, 19. Albino Crayfish, 20. Albino White Perch, 21. Salmon, 22. Yellow Perch, 23. Albino Salmon, 24. Albino Yellow Perch, 25. Burbot, 26. Northern Pike, 27. Albino Burbot, 28. Albino Northern Pike. So, as you can see, it's quite messed up - a special fish IS always after its basic variant, but sometimes separated by one or two others...
Second: I know that you update the game from time to time, for example have introduced the Orange Islands. Perhaps you could add a few more fish? I love the blue colour, so I'm thinking of something which would be very very blue in its "special" variant. It would blend with blue waters well and could live there as part of its camouflage.
Anyway, my favourite was the Actually Rainbow Trout - I love everything rainbow-coloured too.