It's either the merman(male) or the mermaid(female).
A Mermaid
merman
Mermaids or Mermen
Half human, half fish is a Mermaid.
The hippocamp (ἱπποκαμπος, from ιππος meaning hors and κάμπος meaning monster). They were the the half horse, half fish creatures that drove the sea-chariot of the god of the sea Poseidon (who was also the god of horses).
Ophitaurus is a mythical creature that is half fish half cow.
There is no fantasy creature that is half horse half human and NOT called a centaur.
I think you might be thinking of a hippocamp. http://en.wikipedia.org/wiki/Hippocamp
mermaids are creature(s) that live underwater... they are half-human and a half-fish.........
The close I got for half snake and half lion is a Griffin, which has a body of a lion a tail of a snake and a head and wings of a Eagle.
Mermaids are not real. A creature that is half human and half fish is biologically impossible.
Since the hippocamp is a half-horse half-fish creature, the tail is used for swimming.
The half horse, half eagle was a Hippogriff.
It is called the equator