Responses
https://www.mangago.me/read-manga/samezoku_e_no_sasagemono/
i only know of this one, it's like a transformation to merman/shark as well(?). like....the seme is from a shark clan. i love this story (altho yes, it does start out w a bit of sexist undertones.) but over-all the story is lovely and i love the uke and seme is a yearner
Theres desharow merman but it is a manhua so no smut scenes
I feel like it's impossible to find, it's always the uke/bottom that is the merfolk. Feel free to also recommend other themes that need more love but is rare.