Salmon (Salmo salar, genus of salmon)
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....
[salmon] varies much in color and appearance according to age, locality, season, and various names [aleven, parr, smolt, gnilse, kelt] distinguish these conditions.
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.
"Salmon" is derived from Latin "the leaper."