It’s Wednesday’s Wild and Wet Winter … a California Trout, Keepemwet Fishing and Lost Coast Outfitters initiative celebrating California’s wild winter steelhead.
High and turbid winter flows, especially during migration and spawning, make it difficult to accurately assess Northern California’s winter steelhead population. The optimistic estimate is less than 20,000 fish, a mere 10% of historic annual levels, ranging from just north of the SF Bay Area to the Oregon border.
With fewer fish and steady, if not increasing, angling pressure, it’s imperative that we learn how to handle fish carefully and minimize our angling impact on wild fish.
Odds are, if you’re a winter steelhead fly fisherman, you’re also a dedicated catch and release angler. Today there is a small but growing body of scientific research into the impact of catch and release angling not only on mortality, but also on post-release impacts on things like spawning and behavior. And, while little research to date has focused specifically on steelhead, we can extrapolate some generalities from research on other salmonids.
So a few things to keep in mind:
Releasing a steelhead and watching it swim away doesn’t necessarily mean the fish is in optimal shape. And, while that fish is likely to survive, our collective impact is not zero. It’s generally accepted in the angling community that bait is the most effective method to catch a steelhead, followed by lures which in turn are more effective than flies. It’s generally accepted in the scientific community that mortality rates for bait caught fish are higher than lure caught, which in turn are higher than fly caught fish.
A summary covering a number of steelhead mortality studies published in 2002 assumes the following mortality rates: bait 10%, lure 3% and fly 1%. These differences are primarily driven by how frequently a fish is deeply hooked, and make sense when you think about how a fish eats a bag of roe versus takes a fly.
A recent study on British Columbia’s Bulkley River wild steelhead showed a survival rate three days post-capture at 95.5%. This study also demonstrated that fish held out of the water for ten seconds or more suffered impaired equilibrium and an immediate downstream movement compared to fish kept in the water. Learn more about the research here.
If you’re lucky enough to come across a wild winter steelhead this season, please consider keeping your fish in the water, minimize (if not eliminate) air exposure, and handle the fish carefully.
California Trout – to learn more about California winter run steelhead
Keepemwet Fishing – to learn more about Keepemwet priniciples
Lost Coast Outfitters – blog on many things fly fishing related
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Peter Moyle is the Distinguished Professor Emeritus in the Department of Wildlife, Fish and Conservation Biology and Associate Director of the Center for Watershed Sciences, at UC Davis. He is author or co-author of more than 240 publications, including the definitive Inland Fishes of California (2002). He is co-author of the 2017 book, Floodplains: Processes and Management for Ecosystem Services. His research interests include conservation of aquatic species, habitats, and ecosystems, including salmon; ecology of fishes of the San Francisco Estuary; ecology of California stream fishes; impact of introduced aquatic organisms; and use of floodplains by fish.
Robert Lusardi is the California Trout/UC Davis Wild and Coldwater Fish Researcher focused on establishing the basis for long-term science specific to California Trout’s wild and coldwater fish initiatives. His work bridges the widening gap between academic science and applied conservation policy, ensuring that rapidly developing science informs conservation projects throughout California. Dr. Lusardi resides at the UC Davis Center for Watershed Sciences and works closely with Dr. Peter Moyle on numerous projects to help inform California Trout conservation policy. His recent research interests include Coho salmon on the Shasta River, the ecology of volcanic spring-fed rivers, inland trout conservation and management, and policy implications of trap and haul programs for anadromous fishes in California.
Patrick Samuel is the Conservation Program Coordinator for California Trout, a position he has held for almost two years, where he coordinates special research projects for California Trout, including the State of the Salmonids report. Prior to joining CalTrout, he worked with the Fisheries Leadership & Sustainability Forum, a non-profit that supports the eight federal regional fishery management councils around the country. Patrick got his start in fisheries as an undergraduate intern with NOAA Fisheries Protected Resources Division in Sacramento, and in his first field job as a crew member of the California Department of Fish & Wildlife’s Wild and Heritage Trout Program.