http://www.mangago.me/read-manga/blue_eyes_hoshino_lily/
http://www.mangago.me/read-manga/junketsu_ningyo/
http://www.mangago.me/read-manga/koi_uta/
http://www.mangago.me/read-manga/orenchi_no_furo_jijou/
http://www.mangago.me/read-manga/wild_fish/
http://www.mangago.me/read-manga/mermaid_and_the_magician/
There are 16 stories on my Mermaid list, though several are Free DJ's (which are not too bad in my opinion):
http://www.mangago.me/home/mangalist/16523/
Can you guys PLEASE tell me some mermaid yaoi? No doujinshi or anything like that, and I already read the manga by the author of Dekichatta Danshi. And it would help if the mermaid was the main character. San Kyuu (Thank you) everyone! ( T_T)\(^-^ )