Since You Asked: Old Hyatt Lake fish kill - News - MailTribune.com - Medford, OR

Mail Tribune (Medford, OR — Wayback)

2014-08-27

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0 of 3 Premium Clicks used this month SUBSCRIBE Print + Online Subscriber Activation  |  Register x Forgot Password | Need an Account? e-edition | subscribe | newsletter | deals Home News Latest Stories Emergency Services Lack of incumbents, pot issue draws 10 for Medford council races Asphalt plant opponents frustrated during appeal Superintendent welcomes staff to a new school year Medford man gets three-year prison sentence for robbery, assault Crime, Courts and Emergency Services Emergency Services Medford man gets three-year prison sentence for robbery, assault Central Point man arrested after road rage leads to threats, gunfire Emergency services Clemency still sought for husband killer Politics and Elections Lack of incumbents, pot issue draws 10 for Medford council races Council members in Gold Hill dodge voter recall Bill Pullman campaigns for Oregon GMO labeling law Two races set for Ashland council positions Five to compete for three City Council seats Education Superintendent welcomes staff to a new school year Safe haven: Art program provides a place for youth to express themselves Sacred Heart School gets new principal Medford School District considers gifted land for new school Loan default rate threatens Umpqua student aid Environment Ashland marchers won't give up on climate change message OR-7 could be recollared next month Deadly deer virus may be spreading Talent earns Bee City USA designation Those without senior water rights left high and dry State news Nation - World Obituaries Ted E. 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The biologist said there isn't a history of fish kills in  Hyatt Lake, but I recall at least one 10 or 12 years ago. Who's right? — J.S., Ashland Well, J.S., as much as us at Since You Asked Central like triggering spats between readers and sources, we gotta say this time that you're both right. Dan VanDyke, the ODFW's Rogue District fish biologist, said in Thursday's Mail Tribune that Hyatt does not have a history of fish kills triggered by low water in drought years, particularly similarly low-water years like 1992 and '94. That's why he's not planning on any emergency regulation changes to increase or remove the current five-trout daily limit. And you also have good recall about the lake's history. In mid-July 2002 a significant fish-kill event occurred at this reservoir east of Ashland. Lake conditions turned lethal a week ago when as many as 2,000 rainbow trout, some more than 20 inches long, began turning up dead along the shoreline. Hundreds more were seen finning listlessly atop the lake's surface and an unknown number of dead fish whose carcasses had sunk to the bottom. ODFW biologists measured the lake's temperature and dissolved oxygen levels at just 2.6 parts per million, leading biologists at the time to suspect that the trout suffocated.Dissolved oxygen levels of at least 4 parts per million are considered the minimum for trout survival.  That crash in dissolved oxygen likely occurred when the lake's mid-summer bloom of algae died en masse, and the decaying organisms sucked the lake's water of oxygen. The previously recorded fish-kill at Hyatt Lake was an intentional one, when biologists in 1989 poisoned the lake with rotenone to kill off millions of illegally stocked brown bullhead trout and restocked it with rainbow trout the following spring.   Send questions to “Since You Asked,” Mail Tribune Newsroom, P.O. Box 1108, Medford, OR 97501; by fax to 541-776-4376; or by email to [email protected]. We’re sorry, but the volume of questions received prevents us from answering all of them. MailTribune.com Writer Posted Aug. 25, 2014 @ 12:01 am » Comment or view comments   Reader Reaction »  STAY INFORMED   Email NewsLetter   Sign Up Today   Sign up for our newsletter and have the top headlines from your community delivered right to your inbox. calendar Connect with MailTribune.com Facebook Twitter RSS Back to top Reader Services Reader Services Home Subscriptions Subscriber controls Contact us Submissions Photos Events Letters to the editor Corrections Announcements Obituaries Story ideas Since you asked Alerts Email Alerts RSS Feeds Text Alerts Advertise Media Kit Home Products and services Ad rates Advertising contacts Mail Tribune Daily Tidings The Nickel Shop Our Valley Blogs Stay Informed   Email newsletter   Sign Up Today   Sign up for our newsletter and have the top headlines from your community delivered right to your inbox. 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