Piling foundations support many historic structures such as canneries, wharves, and shore buildings. Sardine fishing and canning is a traditional industry in Brittany, where most French canneries remain. Later, sardine canneries developed all along the Portuguese coast. In 1880, Norwegian fish canneries began exporting sardines. Packing houses salted cod and herring, and salmon canneries were opened. A large fishing fleet supported the canneries, mostly staffed by immigrant fishermen. Later, some salmon salteries were converted to salmon canneries. Logging, ranching, numerous canneries, and some copper mining are also prevalent. The prisoners worked on peas farms and in canneries that summer. Salmon populations declined dramatically after the establishment of canneries in 1867. Smaller canneries at Semiahmoo also produced 2,000 cases of canned salmon daily. The Tsirku Canning Company Museum offers a glimpse of Haines' historic salmon canneries. He made drawings and linocuts of fish, fishermen, the canneries, and the dramatic Alaskan landscape. Bushehr's industries include seafood canneries, food-processing plants, and engineering firms. Major industries are commercial fishing and the associated canneries, sport fishing, hunting and tourism.