I was looking for the name of the Celtic god of making really good pasta, when I cam across God Checker. The site contains a comprehensive list of deities from various cultures and mythologies. I had fun looking up the Celtic deities.
FINN-MACCOOL: Legendary Hero of the Fenians.
He burnt his thumb trying to turn the wise fish FINTAN on a makeshift spit, and when he sucked the resulting blister a great splurge of knowledge was released into his head. But his digestive system couldn't cope and all the knowledge passed onto his son OISIN.
With a salmon that smart, it's more than likely it escaped back into the river and burning Finn with a fin was a ruse to put this into effect.
The heroic FINN-MACCOOL delights in cross-country running into strange situations with dogged persistence.