I think you might be thinking of a hippocamp.
http://en.wikipedia.org/wiki/Hippocamp
Half a fish.
Like a mermaid, or merman?
8 ounces of fish = Half a pound =225g
A creature that is half woman and half fish is known as a mermaid. In folklore, mermaids are often depicted as beautiful women with the tail of a fish, inhabiting oceans and seas. They are commonly associated with enchanting songs and the ability to lure sailors, sometimes leading to perilous encounters. Mermaids appear in various cultures and mythologies, symbolizing the duality of allure and danger.
It is 'Half an hour'. In English Grammar, any noun, prefixed by the indefinite article, that begins , with a,e,i,o,u & h uses 'AN'. e.g. An Horse, An House,
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).
the hippocami is half horse and fish and these are loggend are kelpie scottish im not joking what ever
Mermaid.
Since they are mythical, there is no solid proof. Seeing as how they are half horse and half fish, perhaps they eat seaweed and even small fish.
the front half is horse and the back half is a fish. Tyson calls them 'Fish Ponies'
Since the hippocamp is a half-horse half-fish creature, the tail is used for swimming.
If it is a cross between a Human and a: Horse=Centaur, Fish=Mermaid, Goat=Satyr
A hippocampus was a half horse and half sea horse figure.
The Hippocampus is the genus name for seahorses. It is also the name of a mythological creature with the upper half of a horse and the lower half of a fish or dolphin. The hippocampus region of the brain was named due to its resemblance to a sea-horse.
Kart -_-
I think you might be thinking of a hippocamp. http://en.wikipedia.org/wiki/Hippocamp
The half horse, half eagle was a Hippogriff.