Sea urchins are found in the Pacific Ocean from as far north as Alaska to as far south as Baja California. They generally live in rocky-floored kelp forests, ingesting their main sources of food, kelp and algae. In the 1960s sea urchins were considered a threat to the kelp ecosystem as they overgrazed healthy kelp forests. Measures were taken by authorities to try to eradicate urchins, including hammering and dousing them with quicklime. Then, Susumu Kato of the National Marine Fisheries Service (NMFS) Underutilized Species Group developed a new fishery for sea urchins, stimulating the export of the product to Japan as uni. In the 1970s the San Diego Fisherman's Association was formed by local sea urchin and abalone divers, and by the early 1980s they had raised enough support to convince authorities to stop the liming. Today, urchins are hand collected by divers and harvested by hand or with small-scale tools in many ports in California, including San Diego, Santa Barbara and Fort Bragg.