Since at the moment these legendary fish are of little to no use, even though I still somewhat enjoy catching them. I'd like to see perhaps housing furniture that you can create that will display the legendary fish that you caught and maybe a lesser furnishing that you can create with a legendary fish bought from the Market board. This would make fishing legendary fish more rewarding and fun in my opinion as players can display these fish that at times can be a pain to catch and in the process make fishing a bit more profitable by selling the legendary fish they don't want/need for people to use in the lesser furnishings.

In short, create a way for Fishing Records to be linked and displayed on a furnishing that you created with the legendary fish of choice.
And also have an alternate furnishing that doesn't display records but only the legendary fish of choice.