OLW News

A Glut of Carp in the Malheur Basin

posted December 30, 2015

Eastern Oregon is facing a major ecological threat in the form of the Asian carp. The Asian carp is causing an ecological collapse to freshwater lakes in the Malheur Basin. The Asian carp is a bottom feeder and when feeding loosens sediment causing an increase in turbidity to the water. A few carp will not have a dramatic effect on the system, but millions of carp will increase the turbidity enough to not allow photosynthesizing plants to grow. Without plants there is a loss in macroinvertebrates which in turn diminishes native fish and bird populations. The solution... a fish fry! Malheur Lake and surrounding waterbodies are going to allow commercial fishing for the Asian carp in the basin.

To find out more about the Asian carp and how the Malheur Basin plans to combat them, check out this article from the Oregonian here


Tui Chub Found in Diamond Lake!

posted November 10, 2015

Nine years after the $5.6 million eradication of the tui chub, the fish has been positively identified at Diamond Lake. Before the eradication in 2006, the tui chub was reaching populations of close to 100 million in the southern Oregon lake. Diamond Lake is a popular location for trout fishing, bird watching, and swimming; but tui chub at high densities drastically alter the lake's ecology and aesthetics. Tui chub brought about dramatic decreases in insects, increases in algal blooms, and decreases in the trout population.

For more information on the effects and history of tui chub in Diamond Lake check out this article (here) and the EPA's TMDL for Diamond Lake (here).


The Secchi Disk Celebrates its 150th Birthday!

posted November 2, 2015

Earlier this year the Secchi Disk, invented by Pietro Angelo Secchi, turned 150 years old. The secchi disk is an instrument used to measure water clarity and the influence behind the OLW logo! Secchi was first and foremost an astrophysicist, but when asked by the Pope to quantify water clarity in the Mediterranean Sea, he came up with everyone's favorite little black and white disk.  To learn more about Pietro Angelo Secchi and other limnological stories check out these graduate school blogs: UW-Madison Center for Limnology, UNC Chapelhill Marine Sciences, Portland State University Aquatic Ecology Lab.


2014 Oregon Lake Watch Report available.

posted April 16, 2014 

Our Oregon Lake Watch Report summarizing results of volunteer sampling during 2014 is now available.  Invasive Watch List species detected by volunteers included Eurasian watermilfoil, Brazilian elodea, Asian clams, and red swamp crayfish.  A report summarizing results from the first year of Oregon Lake Watch sampling is also available. Thanks to all the volunteers and their keen eyes!


Thanks to the Washington County Fly Fishers Club!

posted July 21, 2014 

Thanks to the Washington County Fly Fishers Club for their generous donation in support of the Oregon Lake Watch!  


June 2014 OLW training session agendas available

posted June 11, 2014 by the OLW team

It's not too late to sign up for one of the upcoming OLW training sessions!  Send us an email at olw.pdx.edu if you'd like to join us or want to find out more about the training sessions.  You can also open the pdf files below to find details about our three upcoming training sessions.  Hope to see you there!


OLW training sessions scheduled for June 2014

posted May 27, 2014 by the OLW team

 We'd like to invite new and returning volunteers to sign up for one of the upcoming OLW training sessions:

  • Saturday June 14th at Rooster Rock State Park located 20 miles east of downtown Portland on I-84
  • Saturday June 21st at the Yoncalla Community Center located between Eugene and Roseburg off I-5
  • or Sunday June 22nd at the Bend Central Library in downtown Bend

Sessions last about six hours and include training in the arts of surveying and identifying invasive aquatic species, monitoring water quality, and choosing sampling sites.  Upon completion of the training you will receive the equipment necessary for the surveys and monitoring.

For those of you who completed a training session in 2013, we we would like you to attend the last couple hours of a session as we will cover new topics including tips for taking high quality species identification confirmation photos and training with the Online Data Entry Portal.  Returning volunteers are more than welcome to participate in an entire training session. 

Please contact us at olw@pdx.edu if you have any questions.  We look forward to seeing you soon!