Steelhead repeat spawners, known as kelts, grow quickly with greater blood fat levels soon after their first spawning, a signal that they will repeat spawning in the first year, according to a recent study.
Irrigation diversions move some water into a canal or pipeline where it can be used for irrigation, but they pose challenges for fish due to changes in water flow, damaged habitats, and blocked migration routes. A specific concern are the millions of fish that could be “entrained” or travel into a harmful environment and outside the natural flow of water because of such structures.
Hatchery females and larger chinook salmon are less likely to return to their hatchery of origin than they are to spawn naturally with wild fish in the Elk Creek basin on the Oregon Coast, even as smaller chinook and males tend to return to the hatchery, according to a recent study.
Some 48 fish and wildlife projects that will cost $43.5 million each year – hatchery work, data management, research -- were reviewed and approved by the Northwest Power and Conservation Council’s Fish and Wildlife Committee at its meeting this week in Butte, Montana.
A recent study combined ecological analysis with the social sciences, identifying a critical link between fish abundance, angler behavior and management actions.
In Oregon’s fertile Willamette River Basin, where two-thirds of the state’s population lives, managing water scarcity would be more effective if conservation measures were introduced in advance and upstream from the locations where droughts are likely to cause shortages, according to a new study.
Nearly 18,000 river kilometers (11,185 miles) of Columbia River basin streams currently has suitable habitat for an invasive predatory fish that, as climate warms, is a range that is predicted to increase by 10,000 river miles by 2080, according to a recent study.
Oregon has overestimated the historical number of coho salmon that ultimately spawned in coastal streams, according to the conclusions of a recent study, and it is likely that the number of coho spawning in Columbia River basin streams has also been overestimated.
A new study finds that the world's marine fisheries form a single network, with over $10 billion worth of fish each year being caught in a country other than the one in which it spawned.