triple-tail

from The Century Dictionary.

• noun A fish, Lobotes surinamensis, whose dorsal and anal fins end behind in a figure like that of the caudal fin, giving an appearance of three tails. Also called flasher and black perch. See cut under Lobotes.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoöl.) An edible fish (Lobotes Surinamensis) found in the warmer parts of all the oceans, and common on the southern and middle coasts of the United States. When living it is silvery gray, and becomes brown or blackish when dead. Its dorsal and anal fins are long, and extend back on each side of the tail. It has large silvery scales which are used in the manufacture of fancy work. Called also, locally, black perch, grouper, and flasher.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An edible silver-grey fish (Lobotes surinamensis) found in the warmer parts of the oceans, and common on the southern and middle coasts of the United States.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun large food fish of warm waters worldwide having long anal and dorsal fins that with a caudal fin suggest a three-lobed tail