New Captive Breeding Program Aims to Stabilize Fingerling Supply
Idaho Department of Fish and Game released approximately one million kokanee fingerlings in June 2026 from the agency’s first captive broodstock program, marking a significant milestone in efforts to maintain consistent fish stocking across the state’s lakes and reservoirs.
The fingerlings, distributed to Hayden Lake and Lower Twin Lake among other waters, represent the culmination of a four-year effort to establish a self-sustaining breeding program that reduces the agency’s reliance on capturing wild spawners each year. The program began in fall 2022 when fisheries staff collected eggs from adult kokanee in the North Fork Payette River and transported them to Cabinet Gorge Fish Hatchery in the Panhandle region.
Beau Gunter, the state’s hatchery production manager, said the transition from concept to operational program moved quickly. “Within about four years, our fisheries and hatchery crews have taken it from a concept to young kokanee being released,” Gunter stated.
The rearing process spans multiple years and locations. Initial fry spent approximately one year at Cabinet Gorge before roughly 15,000 young kokanee were transferred to Grace Fish Hatchery in southeast Idaho. There, they spent two additional years developing to spawning age before their offspring were released as fingerlings this summer.
Addressing Supply Challenges in Wild Populations
Idaho Fish and Game traditionally relies on capturing wild adult kokanee spawners for breeding stock each year. However, survival rates for wild adults fluctuate significantly, creating inconsistent fingerling availability across stocking seasons. The new captive broodstock program addresses that vulnerability by maintaining a population of spawners under controlled conditions.
The agency targets approximately 7 million kokanee fingerlings for annual stocking but has struggled to meet that goal in years when wild populations underperform. The captive program is modeled on the state’s sockeye salmon hatchery approach, which produces roughly one million young sockeye annually with greater predictability.
Fisheries managers are raising three additional generations of captive spawners in hatcheries now and project the program will eventually produce approximately 3 million fingerlings per year—a substantial increase from the current release but still below the full stocking target.
Andy Dux, the regional fishery manager overseeing North Idaho waters, emphasized the benefits for anglers at one of the state’s premier kokanee destinations. “Hayden Lake is one of the most popular kokanee fisheries in the region, so more reliable stocking will benefit anglers in the coming years,” Dux said.
Broader Context and Water Management
Most of the fingerlings released this year are expected to reach catchable size within two to three years, providing meaningful fishing opportunities in the near term. Kokanee fishing in Hayden Lake is almost entirely dependent on hatchery-raised fish, making the stability that captive broodstock offers particularly valuable for that fishery and others across Idaho.
The fingerling releases also come at a time when Idaho’s water management faces broader challenges. Earlier assessments of regional snowpack indicated potential summer water shortages affecting both agricultural and recreational demands.
Idaho Fish and Game manages kokanee populations across numerous reservoirs statewide, with June releases distributed across Anderson Ranch Reservoir, Arrowrock Reservoir, Deadwood Reservoir, Lucky Peak Reservoir, Montpelier Reservoir, Payette Lake, and Ririe Reservoir, in addition to Hayden Lake and Lower Twin Lake.
What Comes Next
The agency will continue monitoring the survival and growth of released fingerlings over the next several years while ramping up the captive spawning program toward its three-million-fish annual goal. As additional generations of captive-bred fish mature, Idaho Fish and Game expects to reduce dependence on wild-caught spawners and deliver more consistent stocking numbers to anglers across the state.