BAYFIELD, Wis. (AP) — The Wisconsin Department of Natural Resources is considering a permanent limit on cisco harvesting in the state's Lake Superior waters, an idea facing opposition from commercial fishing operations.

Wisconsin Public Radio reports the agency held a public hearing Monday in Bayfield about the proposed rule to maintain the cisco population. The fish, also known as lake herring, is a food source for commercially important lake trout and whitefish.

Brad Ray, senior fisheries biologist for the department, says cisco harvests quadrupled in 2008 when tribal and state commercial fishermen harvested approximately 1.4 million pounds. He says the rule would limit Wisconsin's 10 commercial license holders to 130,000 pounds each.

Maurine Halvorson of Halvorson Fisheries in Cornucopia says she opposes the rule because she believes the lake has plenty of cisco.