Emerald fish

(Zool.) a fish of the Gulf of Mexico (Gobionellus oceanicus), remarkable for the brilliant green and blue color of the base of the tongue; - whence the name; - called also esmeralda.

See also: Emerald

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in classic literature ?
It is surprising that they are caught here -- that in this deep and capacious spring, far beneath the rattling teams and chaises and tinkling sleighs that travel the Walden road, this great gold and emerald fish swims.
Trade all my emerald fish scales for a limber pair of gams.
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