Fish Man (鲛人/jiaoren): a mermaid, specialised in weaving waterproof silk fabric.
According to the Book of Supernatural Beings (搜神记), Fish Men/Women look like humans but with a fishtail. When they weep, their tears would turn into pearls; and their body oil can keep a lamp burning for a thousand years. (南海之外有鲛人,水居如鱼,不废织绩。 其眼泣则能出珠)