Do Fish Use Cold Current To Cross Tropics

A big, old Patagonian toothfish found thousands of miles from home is bolstering the theory that large fish can take advantage of very deep, cold ocean waters to cross the tropics from one polar region to the other, swimming under warm water in which they ordinarily could not survive.

The Patagonian toothfish (Dissostichtus eleginoides) is normally found in the icy sub-Antarctic waters off South America. So when a commercial halibut fisherman pulled one in November 2000 from the Davis Straight off the coast of Greenland, he was surprised.