For years he tries to catch the Salmon of Wisdom, a fish that will grant all the world's knowledge to whoever eats it.
He therefore receives the fish's knowledge, which he can access by putting his thumb in his mouth again.
[3][4] Nuada is referred to in some sources as Nuadu Finn-Éces, and certain authors suggest that the story of Fionn Mac Cumhall and the salmon of knowledge is related to the cult of Nodens or Nuada, which was introduced into the Boyne Valley mythological corpus some time in the early centuries BC.
[5] Nuada was integrated into Fenian lore as an ancestor of Fionn, the name Finn-Ecas meaning "Finn the Seer."
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