Every summer fish biologists across the state suction snorkel masks onto their faces. With scuba diving flashlights in hand, they crawl, swim, and slither up the tributaries of rivers literally counting the number and species of salmon they see to measure the health of the population. This method to monitor the salmon and steelhead populations is effective and low tech and it hasn’t changed much over the years. But the salmon population in California has changed. KALW's environment reporter, Angela Johnston has the story.
