It would be awesome if we could catch different types of fish, and then put them into personalized fish tanks. We would also have to feed them, and they could have little baby fishes :D
Also have growth and a salmon collector and there could be quariums (small furntiure like) likkle waters (cultivation in home street and can get salmon from) and pools (can get in and can hold tons of fish, can collect, maybe even diving boards, and be like a tower big project) + 1