I have noticed that a lot of the harder to catch fish, or the "legendary fish" serve no purpose but to take up space in you're inventory and retainer. This goes to the same with a lot of fish that are not used in crafting or cooking, so I have thought of a neat and fun way to solve this solution.I suggest that we have large aquariums where we can store fish ( including the giants like the megalodon or octopus) and watch them swim around. heck, maybe we can even feed them so that they produce materials (idk suggestions here). Any way I propose that we access these aquariums via retainer in which takes us to a separate room, sort of like an inn. there we can display our favorite fishes. In fact, this can also become a cool feature for housing, so that you can show off all the cool fish you have collected on your journey.