Fiji mermaid
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The Fiji mermaid was an object composed of the torso and head of a juvenile monkey sewn to the back half of a fish. It was a common feature of sideshows where it was presented as the mummified body of
Another "mermaid", made of papier-mâché, from the same collection of Moses Kimball—Harvard University's Peabody Museum of Archaeology and Ethnology
The Banff Merman, similar to a Fiji mermaid, on display at the Indian Trading Post
A merman constructed out of wood carving, and parts of monkey and fish, Booth Museum, Brighton
Ningyo
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Ningyo, is a creature with both human and fish-like features, described in various pieces of Japanese literature.
Fiji mermaid
…Jenny Haniver Ningyo The Feejee Mermaid Hoax…
Japanese mermaid (ningyo). Coiffed with nihongami hairstyle of the Edo Period.— Santō Kyōden Hakoiri musume menya ningyō (1791)
The ningyo (人魚) aka ryōgyo (鯪魚; 'hill-fish') (cf. full image)
The Teijin (氐人), or the "Di people"
A ningyo (人魚), aka Teijin (氐人) or a Di countryman—Toriyama Sekien's Konjaku Hyakki Shūi (1781)