Salmon are a cold-water fish and all things being equal they prefer...Putman said that his previous studies of the Columbia River have shown... <a href="http://www.bio-medicine.org/inc/biomed/biology-news.asp">http://www.bio-medicine.org/inc/biomed/biology-news.asp</a> http://feeds.bio-medicine.org/latest-biology-newsDate:2/7/2013 archers point out.