Also Greenland Shark, which “has the longest known lifespan of all vertebrate species (estimated to be between 250 and 500 years)”: The flesh of the Greenland

Also Greenland Shark, which “has the longest known lifespan of all vertebrate species (estimated to be between 250 and 500 years)”: The flesh of the Greenland shark is toxic because of the presence of high concentrations of trimethylamine oxide (TMAO). . . . Traditionally, this is done by burying the meat in boreal ground for 6–8 weeks, which presses the TMAO out of the meat and also results in partial fermentation. The meat is then dug up and hung up in strips to dry for several more months.[46] It is considered a delicacy in Iceland. https://en.wikipedia.org/wiki/Greenland_shark https://en.wikipedia.org/wiki/Greenland_shark