I think you might be thinking of a hippocamp.
http://en.wikipedia.org/wiki/Hippocamp
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Half a fish.
Like a mermaid, or merman?
8 ounces of fish = Half a pound =225g
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,
If a horse travels at 25 kilometers per hour for a half hour (30 minutes), it will travel 12.5 kilometers.