skip to main content
skip to newscasts

Thursday, April 25, 2024

Public News Service Logo
facebook instagram linkedin reddit youtube twitter
view newscast page
play newscast audioPlay

Louisiana teachers' union concerned about educators' future; Supreme Court hears arguments in Trump immunity case; Court issues restraining order against fracking waste-storage facility; Landmark NE agreement takes a proactive approach to CO2 pipeline risks.

view newscast page
play newscast audioPlay

Speaker Johnson accuses demonstrating students of getting support from Hamas. TikTok says it'll challenge the ban. And the Supreme Court dives into the gray area between abortion and pregnancy healthcare, and into former President Trump's broad immunity claims

view newscast page
play newscast audioPlay

The urban-rural death divide is widening for working-age Americans, many home internet connections established for rural students during COVID have been broken, and a new federal rule aims to put the "public" back in public lands.

Salmon Projections: Hard to Catch, Harder to Count

play audio
Play

Monday, March 5, 2012   

PORTLAND, Ore. - Starting this month, more than 314,000 chinook salmon are expected to make their way up the Columbia River - an impressive spring return, if it happens. However, the actual numbers often end up being very different than the early projections, and last year, none of the salmon stock returns lived up to the early estimates.

According to Doug DeHart, a former Oregon Chief of Fisheries, the most common methods for these "educated guesses" haven't proven especially reliable in recent years.

"These large error rates have led the scientific folks who do this stuff to have a whole series of little conferences about, 'What's going wrong here? Should we change how we project these numbers?'"

The projections are used to set fishing seasons, make management plans for dams and hatcheries, and more. Over the last 30 years, they have been higher than actual returns 11 times and lower 19 times; only seven of the forecasts were close to the actual fish numbers.

DeHart, who is a fisheries biologist, agrees it should be a good year for salmon fishing, both spring and fall. He says there is always uncertainty where nature is involved, although efforts to boost salmon survival appear to be working - most notably, the additional water spilled over the Columbia River dams as required by a court order.

"The spills clearly produced additional survival. We saw it in the juveniles and now we're seeing it in the numbers of adults. It's an important addition, and one of the few new tools in the toolbox."

Fish and wildlife departments in Washington and Oregon also credit good ocean conditions for improved fish survival.

DeHart points out that at least 80 percent of the returning fish originated in hatcheries. The separate counts for the endangered, wild fish don't look as impressive, he adds.

"They're the ones that are ESA-listed and constrain fisheries. That's the big challenge. And there the news is cautiously optimistic, but not great."

If the forecast of 462,000 returning fish for a different salmon stock, the sockeye, is true, it would set a Columbia River record.

Fish forecast numbers are from the Washington Dept. of Fish & Wildlife and Northwest Sportsman magazine.



get more stories like this via email

more stories
Rep. Crystal Quade, D-Springfield, the House Democratic floor leader, called Missouri politicians "extremist" on social media after they passed the most restrictive abortion ban in the country and defunded Planned Parenthood. (Fitz/Adobe Stock)

Health and Wellness

play sound

The Missouri Legislature has approved a law to stop its Medicaid program, known as MO HealthNet, from paying Planned Parenthood for medical services …


Environment

play sound

A round of public testimony wrapped up this week as part of renewed efforts by a company seeking permit approval in North Dakota for an underground pi…

Social Issues

play sound

Air travelers could face fewer obstacles in securing a refund if their flight is canceled or changed under new federal rules announced Wednesday…


The Iowa Movement for Migrant Justice calls Senate File 2340 a "ridiculous stunt," passed in an election year "to mobilize voters using fear and anti-immigrant sentiment." (Adobe Stock)

Social Issues

play sound

Advocates for immigrants are pushing back on a bill signed by Iowa Gov. Kim Reynolds in the last few days of the legislative session, modeled on a …

Environment

play sound

An environmental group is suing the U.S. Fish and Wildlife Service to protect the Arkansas mudalia snail under the Endangered Species Act. In …

Currently, more than 2.7 million Californians live within 3,200 feet of an operational oil well. (MSPhotographic/Adobe Stock)

Environment

play sound

Leaders concerned about pollution and climate change are raising awareness about a ballot measure this fall on whether the state should mandate buffer…

play sound

A coalition of climate groups seeking cleaner air at the rail yards and ports of Los Angeles and Long Beach will hold a "die-in" rally tomorrow at Los…

Health and Wellness

play sound

By Marianne Dhenin for Yes! Magazine.Broadcast version by Shanteya Hudson for Georgia News Connection reporting for the YES! Media/Public News …

 

Phone: 303.448.9105 Toll Free: 888.891.9416 Fax: 208.247.1830 Your trusted member- and audience-supported news source since 1996 Copyright © 2021