Maryland became the first state to regulate genetically modified fish this week when Gov. Parris Glendening (D) signed a law that prohibits raising such fish unless they are in ponds or lakes that do not connect with other waterways. Under the law, fish growers must also make sure the fish cannot escape by other means, such as getting picked up and dropped by a bird. The U.S. Food and Drug Administration is currently considering whether to allow sales of genetically modified fish.