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About Cottage Grove sentinel. (Cottage Grove, Or.) 1909-current | View Entire Issue (Aug. 26, 2015)
COTTAGE GROVE SENTINEL , 2015 3B Warm water and disease: a deadly combination that kills juvenile summer steelhead at Rock Creek Hatchery FROM THE OREGON DEPARTMENT OF FISH AND WILDLIFE Photo taken from Wikipedia Steelhead fi ngerlings have been threatened by bacteria and parasite infections. ROSEBURG, Ore. – High water temperatures and re- peated bouts of bacteria and parasite infections beginning in May have killed over 150,000 summer steelhead fi ngerlings at Rock Creek Hatchery. The hatchery began losing fi sh in May when warm water temperatures led to outbreaks of both a bacterial infection and external parasite common in fi sh hatcheries, according to Dan Meyer, ODFW hatchery manager. “We immediately treated the fi sh and got them healthy, but once we moved them to out- side raceways, the disease broke again and again,” Meyer said. “However, the combination of pathogens and unusually high temperatures created a perfect storm that we were never able to get out in front of.” Although the majority of the fi sh died the week of July 9-17, when Meyer estimates losses were as high as 15 percent a day, hatchery staff didn’t realize the full extent of the loss until a routine inventory in early Au- gust. During much of June and July, when the fi sh were under constant treatment for infection, they were not healthy enough to withstand the sampling needed to get a more accurate count. According Craig Banner, ODFW fi sh pathologist, colum- naris (a bacterial infection) and ichthyphthirius (an external par- asite often known as “ick”) are found in low levels in the North Umpqua River, which supplies water to the hatchery. When water temperatures rise, patho- gen levels can increase rapidly, overwhelming a fi sh’s natural defenses. Water temperatures in the North Umpqua River ex- ceeded 71 degrees in July, com- pared to previous years where highs were in the mid-60s. Meyer said it will be diffi cult to accurately estimate the total extent of the loss until the fi sh are larger and ready for release in October. However, the loss is signifi cant and Meyer estimates it could reach 95 percent. The impact on future fi sheries is also diffi cult to predict. To meet the objectives of the Coastal Multi- species Conservation Plan, the hatchery had increased its sum- mer steelhead production this year so there were more fi sh to start with. Also, summer steel- head in the Umpqua tend to re- turn over a two year period so any declines in returns could be spread over time. Buoy 10 Chinook season goes to fi n-clipped only on Monday The columbia River Buoy 10 Chinook fi shery has limited harvest to keep the fi shery open through labor day FROM THE OREGON DEPARTMENT OF FISH AND WILDLIFE CLACKAMAS, Ore. – In an effort to keep the Columbia River Buoy 10 Chinook fi shery open through the Labor Day weekend, fi shery managers de- cided today to limit Chinook harvest to hatchery adipose fi n-clipped fi sh only beginning Monday, Aug. 24. Thanks to excellent fi shing early in the season, anglers are quickly approaching the number of allowable impacts on ESA- listed wild tule Chinook, the limiting factor for the Chinook fi shery. Managers hope today’s action will extend the Chinook fi shery through Sept. 7 as origi- nally scheduled. “This year’s Buoy 10 fi shery started out strong, with very high catch rates and a near-re- cord level of angler participa- tion,” said Chris Kern, ODFW fi sh division deputy administra- tor. “Limiting harvest to hatch- ery fi sh should allow Chinook anglers to keep fi shing through the holiday weekend.” Catch in the Buoy 10 fi shery through Aug. 20 includes 18,600 Chinook kept during 46,600 an- gler trips, and mangers expect the good fi shing to continue. Under the rules adopted to- day: Effective Monday, Aug. 24 through Monday, Sept. 7 only adipose fi n-clipped Chinook may be retained. The overall daily bag limit will continue to be two adult hatchery salmon or steelhead, in combination, only one of which may be a Chinook. All wild steelhead, coho, and Chi- nook salmon must be released. As in all years, all jack salmon caught between Tongue Point and Buoy 10 must be released through Sept. 30. Anglers may transport un- clipped Chinook salmon caught in adjacent fi sheries (such as the ocean or the Columbia River above Tongue Point) through the Buoy 10 area, but cannot fi sh in Buoy 10 with an un-clipped salmon on board. All Chinook retention in the Buoy 10 area is scheduled to close Sept. 8-30. However, managers will be monitoring the fi shery and an earlier closure is possible if effort and harvest rates continue to be high. See the ODFW web page for in-sea- son updates. In the meantime, managers are predicting over half a mil- lion coho will be returning to the mouth of the Columbia and anglers can look forward to some good coho fi shing at Buoy 10, Kern said. $ PUUBHF ( SPWF 4 FOUJOFM Our Community Newspaper since 1889 Subscribe and $AVE Health Services Directory Counseling & Mental Health South Lane Mental Health Douglas G. 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