Miami Herald: Maybe the fish are on to something. Don Hammond, who catches, tags and releases dolphin-fish (also known as mahi-mahi), says those Florida natives are being hooked in some unusual places. Like Massachusetts and Canada. People who study South Florida’s environment say global warming is starting to have a significant impact on Florida’s fish, fowl and flora. Among those beginning to see the signs is Hammond, a private researcher in Charleston, S.C., who retired after 35 …