It will have 149 years worth of pollutants in it. You can google for yourself which fish are the best to eat but generally the older the fish- the more chemicals it has in its body.
Good point. One of my favourite fish is Kargulena (I've seen it called ice fish
on fishy websites). When it's small it has a sweet, light flavour, but if you get a large one, it has a nasty metallic taste. Scary.