Endangered giant bluefin tuna have returned to Prince Edward Island, Canada in surprising abundance after a complete disappearance from overfishing. But something strange is going on. Normal... Read allEndangered giant bluefin tuna have returned to Prince Edward Island, Canada in surprising abundance after a complete disappearance from overfishing. But something strange is going on. Normally wary tuna no longer fear humans.Endangered giant bluefin tuna have returned to Prince Edward Island, Canada in surprising abundance after a complete disappearance from overfishing. But something strange is going on. Normally wary tuna no longer fear humans.