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[thred-fin] /ˈθrɛdˌfɪn/
any spiny-rayed fishes of the family Polynemidae, having the lower part of the pectoral fin composed of numerous, separate, filamentous rays.
1885-90; thread + fin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for threadfin
  • Cast in shallow waters where the threadfin shad tend to linger, especially right before the temperature starts to drop.
  • threadfin shad and gizzard shad are not recommended because they will become overpopulated.
  • Predatory fish have diverse and abundant forage in the form of alewives, gizzard shad, threadfin shad and shiners.
  • Use of threadfin shad as a forage species in channel catfish production ponds.
  • Live bait includes large minnows or gizzard or threadfin shad.
  • Populations of all the forage species have remained fairly abundant with the exception of threadfin shad.
  • Cut gizzard shad, big threadfin shad, and white perch seem to be the best baits.
  • threadfin shad and silverside minnows are the primary forage fish.
  • No differences in pathogens or in length-weight frequencies were observed in the threadfin shad.
British Dictionary definitions for threadfin


noun (pl) -fin, -fins
any spiny-finned tropical marine fish of the family Polynemidae, having pectoral fins consisting partly of long threadlike rays
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Encyclopedia Article for threadfin

any of about 24 species of marine fishes of the family Polynemidae (order Perciformes), widely distributed along warm seashores, often over sand. Threadfins have two well-separated dorsal fins and a forked tail, and are usually silvery in colour. Their name refers to their pectoral fins, each of which is divided into an upper, normally shaped fin and a lower section consisting of four to seven long, threadlike rays that serve as sensory devices; they are especially long in the young. Most threadfins are 30-60 centimetres (1-2 feet) long; one species, Eleutheronema tetradactylum of India, is about 1.8 metres (6 feet) long.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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