Salmon fishermen on the West Coast of the United States are expressing increasing concern about threats to the fish population.Heat waves and drought, a long period without rain, are raising water temperatures and lowering water levels.The extreme conditions are killing wild fish from Idaho to California.Hundreds of thousands of young salmon are dying in Northern California's Klamath River.The low water levels fuel the spread of parasites that kill the fish.A collapse of one year's group of young salmon can have lasting effects on the total population.It can also shorten or stop the fishing season.Climate change is making the American West hotter and drier and endangering the salmon fishing industry.The industry is worth about $1.4 billion dollars in California alone.The falling numbers of wild salmon catches has caused a sharp rise in price for the fish.Fisherman Mike Hudson says people are not able to spend $35 for a pound, about 450 grams, of the fish.
