What are the real mermaids recorded in Shan Hai Jing?

In Shan Hai Jing, Northern Ocean Jing recorded a mermaid named Yu Ling. According to records, there is Yu Ling in the sea. It has hands and feet and cries like a child.

It can be seen that the spiritual fish lives in the sea, with a human face and a fish body, which is basically the same as the mermaid we imagined. Strangely, this spiritual fish has hands and feet and cries like a baby, unlike a mermaid with only a tail.

Later, according to records, Yu Ling is actually Jiao Ren, and Jiao Ren's records have a clear source in Su Ji Shen. Jiao Ren in Sue Ji Shen lives in the South China Sea, lives in the water like a fish and cries like a turbot.