What is a GSO?
A Gulf Stream Orphan: A larval or juvenile tropical fish that gets transported north by the Gulf Stream.
These tiny fish (often smaller than a quarter) are able to survive this remarkable journey thousands of miles north thanks to the warmer water temperatures along the coast of the Northeast United States in the summer. Divers familiar with these waters have an excellent chance to view these southern visitors in the late summer and early fall when temperatures remain warm enough for these tropical fish to survive. Unfortunately, as winter approaches these fish are not able to tolerate the drop in water temperature and will not survive.