Salmon (Salmo salar, genus of salmon)

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He [Joyce] once asked me to paint for him a salmon (an avatar of HCE) "A salmon is a wonderful thing," he said to me.... 

Frank Budgen 

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[salmon] varies much in color and appearance according to age, locality, season, and various names [aleven, parr, smolt, gnilse, kelt] distinguish these conditions.

Webster

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Finn is, by name and thumb, connected with the finny tribe. As Fintan, he was a salmon; as Finn, he got his thumb of wisdom from touching a mythical salmon - hence the steady connection of salmon-Solomon.

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"Salmon" is derived from Latin "the leaper."