Keith Lusher 12.15.25
State fishery managers are utilizing a small, streamside incubation system to assist deliver chum salmon again to a tributary of the Clatskanie River in northwest Oregon.
ODFW not too long ago put in a hatchbox system alongside the stream in an effort to reintroduce chum salmon to the watershed. The undertaking was first reported by Oregon Public Broadcasting.
The system consists of six massive barrels, three that filter stream water and three that maintain trays of fertilized salmon eggs. As water flows via the containers, it retains the eggs oxygenated whereas defending them from predators.
When the eggs hatch, normally in January, the younger fish are flushed straight into the stream.
Tom Stahl, a fish biologist with ODFW, stated hatchboxes are a value efficient technique to enhance salmon numbers in waterways that now not help wild runs.
“There are not any chum right here,” Stahl stated. “We wish to reintroduce them. This offers us a means to do this with out impacting current wild fish.”
Hatchboxes have been as soon as widespread throughout Oregon and have been incessantly utilized in faculties to show college students concerning the salmon life cycle. Their use declined over time as considerations grew about hatchery fish competing with wild salmon and the truth that hatchbox fish are launched at a a lot smaller measurement than these from conventional hatcheries.
aAnother concern is that hatchbox fish should not marked, that means they can’t be distinguished from wild salmon as soon as they return to spawn.
Nonetheless, tribal leaders and state officers say hatchboxes can play a task in areas the place salmon runs have practically disappeared.
Brenda Meade, chair of the Coquille Tribe, stated drastic declines in fall Chinook returns compelled managers to contemplate each obtainable instrument. Returns on the Coquille River dropped from roughly 10,000 fish in 2017 to only three brood pairs by 2020.
“They have been calling it close to extinction ranges,” Meade stated. “It was devastating.”
A number of elements contributed to the decline, together with warming water temperatures, low flows, poor habitat and altering ocean circumstances. One main challenge was the introduction of smallmouth bass into the watershed, a predator recognized to devour juvenile salmon.
In response, the tribe and its companions started eradicating bass utilizing electrofishing boats and incentive primarily based fishing derbies.
The Oregon Legislature additionally took motion this yr by passing Senate Invoice 221, which directs ODFW to encourage and research new hatchbox tasks in Coos County. Whereas the Clatskanie hatchbox isn’t a part of that invoice, ODFW plans to observe outcomes as related tasks transfer ahead.
Stahl stated the objective is to judge whether or not hatchboxes can meaningfully improve salmon returns over time.
“These fish might be out within the ocean for a number of years earlier than they return,” he stated. “It’s going to take persistence, however we’ll be watching carefully.”
