Waterborne chemicals leached from plastics and detergents, including bisphenol A (BPA), may have contributed to significant lobster die-offs in the waters of Long Island Sound over the last decade, researchers say. As many as half of the lobsters tested in areas where lobster populations have plunged showed high levels of alkylphenols, a group of chemicals derived from detergents, paints, and plastics, according to researchers at the University of Connecticut.