2006年开始人工放养，4年后野生鱼苗出生。
你钓到的肯定不是Atlantic salmon。可能是Chinook salmon，几十年前开始在五大湖人工放养。

http://en.wikipedia.org/wiki/Atlantic_salmon#Distribution_and_habitat
Atlantic salmon were native to Lake Ontario but were extirpated by habitat loss and overfishing in the late 19th century.

http://en.wikipedia.org/wiki/Chinook_salmon
In 1967, the Michigan Department of Natural Resources planted chinook in Lake Michigan and Lake Huron to control the alewife, an invasive species of nuisance fish from the Atlantic Ocean. Alewives then constituted 90% of the biota in these lakes. Coho salmon had been planted the year before and the program was a success. Chinook and Coho salmon thrived on the alewives and spawned in the lakes' tributaries. After this success, chinook were planted in the other Great Lakes

http://www.bringbackthesalmon.ca/