I found some scanalations of lots of mermaid manga and mermen too!
Mister Mermaid
On a full moon night, Subaru - a merman - coincidentally saved a man who sank into the ocean. After that, in order to see that man again, Subaru traded off his tail for a pair of legs and came to the surface to find Tatsuki - the man's name. Despite of his throbbing feet and his lost voice, Subaru was happy to be able to stay by Tatsuki's side. However, his happiness soon faded away when he found out the reason why Tatsuki was at the bottom of the ocean that day.
Mermaid Line
A series of short mermaid manga stories
Mermaid Saga
Legend has it that if a human eats a mermaid's flesh, they will be granted eternal life. But is that a blessing or a curse? Immortal lovers Yuta and Mana travel through Japan and the centuries longing for a normal life. On their journey, they meet others who have consumed the flesh of a mermaid in hope of becoming immortal. But the powerful substance affects each person differently. Yuta and Mana are two of the lucky ones. Others are fated to die or transform into a savage monster, a "lost soul." Mermaid Saga contains three of Takahashi's uniquely macabre mermaid tales, A Mermaid Never Smiles, The Village of the Fighting Fish, and Mermaid Forest. Each revolves around Yuta, who wanders for hundreds of years, seeking a mermaid to cure him of his immortality.
edit: Actually the above link no longer works but it's online on other sites, you can buy it or rent it from the library and the anime is on youtube
Mermaid Melody Pichi Pichi Pitch
Lucia is the new girl at school. She and her sister run a public bath that's all the rage. When Lucia meets a terrific-looking surfer boy, Kaito, she starts to think if he's the dream boy she was looking for that she met a few years ago. There's just one little problem: Lucia is a mermaid-not just any mermaid, but a princess on an important mission to save the seven seas from an evil force bent on taking control of the marine world. Such a responsibility doesn't leave much time for romance. But Lucia vows to protect her world and win the heart of handsome Kaito
School Ningyo
Two girls go hunting for mermaids to win their true love. Featuring very untraditional mermaids.
Kaizoku to Ningyo
During the time when the world is full of barren lands and big ships sail out to the vast oceans, a very rare type of sub-human--mermaid--was born. Normally, they have white hair, but only in water does the color change. Among the aristocrats, they are traded for large sums of money. Hisui is a merman with scarlet hair, and he's kept by a lord. However, as he's stolen away by the pirate Ikuta and gains freedom, they start their journey together!
Ningyo Hime Aqua
Jinae and Jadae are twins. Ever since they were together when they were little, Jadae is always the one who is praised by the adults, being outgoing and older.
Whenever an accident occurs, the one to be scolded was always Jinae.
To Jinae, everyone likes Jadae better than Jinae, ranging from her dad, uncle, aunt and the sensei at school. Due to this, she hates adults.
Then, she met a cute boy at the beach! Also, He's the first one who's willing to listen to Jinae's story about mermaids.
Ningyo Hime-dono
First there was Cinderalla...then there was Hansel and Gretel...now, the third and final piece in Junko Mizuno's full-color fractured "fairy tales" series, Princess Mermaid! In this dark-hued ocean fable, three beautiful and seductive mermaid sisters, Tara, Julie, and Ai, lure unsuspecting sailors into their underwater pleasure palace only to...eat them!?! Crazed with vengeance for human atrocities against their mother, these mermaid sisters have sworn to kill...but things take a twist when Julie falls for the all-to-human Suekichi, and the two lovers find themselves in the middle of an inter-special feud. Will Julie find true love? Or will the double-dealings of the lusty Dragon of the deep take things in a whole other direction?
Anyone know of any others? Post links if you can
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