As of 2021, California is home to 31 distinct kinds of native salmon, steelhead and trout species, 20 of which are found only in our state. These fish are prized for their economic and cultural significance by local communities, and for their recreational attributes by anglers from around the world. But these fish face an alarming threat that can’t be ignored. If current trends continue, nearly half of these fish will be extinct within the next 50 years. How do we know this? And perhaps an even better question: what can be done about it?