European Eel

"Maximum longevity: 88 years (captivity) Observations: In the wild, these semelparous animals die after first spawning. After transformation from juvenile to adult stage they do not eat and feature elevated corticosteroids while they migrate to the Sargasso Sea to spawn. Preventing migration by keeping animals in captivity significantly extends lifespan. One female called "Putte", generally assumed to be a European eel, died at Halsinborgs Museum in Sweden at about 88 years of age (Caleb Finch 1990). In the wild, animals do not commonly live more than 10-15 years, though it is possible some live up to 30 years (http://www.fishbase.org/)."