Woman transformed into half fish sea being

Mami Wata

a mermaid, with a woman's upper body and a fish's tail

Iara

often described as half-woman and half-fish

Sedna

Sedna is most often described as a woman transformed into a being of the deep, her lower body merging into that of a great fish or sea mammal, and her long hair, which she cannot comb herself, drifting loose in the currents around her.

Liban

Her prayer was granted in a partial and striking form: her lower body became that of a salmon while her upper body stayed human, making her a mermaid in the literal sense of the word, and her dog was transformed alongside her into an otter.