Faced with growing concerns about the hunting of freshwater turtles in the United States for Asian food markets, federal officials this week proposed adding four species to an international list of plants and animals designed to manage commercial trade in the reptiles.

The U.S. Fish and Wildlife Service on Thursday said that listing the common snapping turtle, Florida softshell turtle, smooth softshell turtle and spiny softshell turtle would allow it to better monitor exportation of these species, particularly to Asian nations, where turtle populations have been wiped out due to high demand for their meat.

Bringing the species under the protection of the Convention on International Trade in Endangered Species of Wild Fauna and Flora would require exporters to obtain a permit before shipping turtles overseas. That would help the federal agency determine the extent of legal and illegal exportation and decide whether additional conservation efforts were needed.