Recent Posts


Green Drakes Sage Fly Rods Metolius River Sharks Mia Sheppard Bryan Huskey Big Trout Fly Tying A River Between Us Elk River history Soul River Rob Crandall Klamath FarBank Kamchatka Echo SA Instagram frying pan river Carp Nehalem River Bamboo A River for Christmas hot water West Slope Cutthroat Winter Steelhead Sandy River Rogue River Catch Magazine Whitefish LaFollette homestead Kickstarter photography Pelton Dam Trout Spey Simon Gawesworth Jason Atkinson Travally Willamette Falls Steamboat Creek Metolius Salmon Fly McKenzie River Fly Fishing Film Tour Deschutes National Forest Fly Fishing Collaborative Soft Hackles Lincoln Motor Company Prineville Eric Neufeld Olympic National Park Jay Nicholas Invasives Douglas County Steelhead Sanctuary Mexico Nevada Trailer Trash Thursday Blast from the Past Native Fish Society Trout-a-Thon Travalley Salmonfly hatch Parasite Adventure PGE Seychelles Bears Boston Whaler #keepemwet Little Creek Outfitters Kenny Morrish Winston Fly Rods Elk & Sixes Project Healing Waters Fly Reels Trout Unlimited native fish Streamers Sea Trout Atlantic Salmon Fly Expo Yellowstone Road Trip Fall River How to Roamerica Trout New Zealand March Browns Oregon Back Roads Redband Trout Bruce Buckmaster Fishing Report Wader Maker Contest North Umpqua Winter Spey Strategies Bull Trout Bill Black Jurassic Lake roll cast G3 Waders Morrish's Fluttering Stone CFR Atlantic Salmon Hardy Reel Chinook Salmon Twin Bridges Chum Salmon hatcheries Deschutes River Mountain Goats Kevin Callaway ODFW Spirit River Costa Lost and Found PMDs The Creel Simms Caddis Guided Fishing Christmas Alaska Cuba Extinction small creeks Smithers Spey Fishing Tips Steamboat Inn Coat Drive Fishing License invasive species Kenny 5 Legs Permit Clackamas Willamette Legos Owyhee River Salmon habitat Rainbow Trout Sea-run Cutthroat Maupin flies Vets Salmonflies Brown Trout Abel Reels BC Northern California Rio Products Dry Fly Sage Home Waters for the Holidays Argentina Steelhead Sea lions Mending Cutthroat Trout Oregon Small Streams Salmon Watch Spring Chinook Brian Silvey Brian O'Keefe Sea-runs Big Bugs Oregon Department of Fish and Wildlife Klamath Dams Grand Teton Warm Water Keepemwet Fishing Pacific ocean Dale La Follette Sr. Scientific Anglers Wild Steelhead Coalition Fly Fishers Club of Oregon Skaters Corey Koff Redside Rainbow Bauer Fly Reels Green River Press Release Crooked River Bass Snow Mako Shark Renzetti Summer Steelhead Bonefish Klamath River Montana Native Trout Klamath Lake Tarpon F3T Dolly Vardon Poachers Craig Montana Willamette River Oregon Trout Bum Salmon-Trout Williamson River Oregon Trout Trail Tenkara Nautilus Reels Christmas Trees Stefan Tritscher Deschutes River Alliance Film Contest Wild fish Ochoco Creek Marty Sheppard Sweden McKenzie North Coast: Pyramid Lake saltwater Columbia River John Day River Mousing Casting for Recovery Port Orford Water Time Outfitters Black Friday Clackamas River Dean Finnerty Puget Sound Salmon Bozeman Winston boat cleaning stations State of Jefferson Southern Coast Lahontan Cutthroat "Clipped" Tying Contest tippet rings Spey-O-Rama Frank Amato Kate Koff Senator Ron Wyden fly fishing Bulkley Patagonia Outdoor Adventure Day vintage news Senator Jeff Merkley Frank Moore British Columbia Black Spot Bill Bakke Goldenstones pay it forward Kispiox Coho Rio Coho Salmon Deschutes Cookie Lady Colorado Trout Bum Road Trip Redfish Florida Keys on-line fly shop Trask John Day Todd Moen Conway Bowman Bamboo Rods Rio Fly Lines


    Camp Water

    Camp water is close to home. Here you will find information on stuff happening here in the shop and on our local waters. You'll also find our weekly newsletter feature, Trailer Trash Thursday, a fun collection of fly fishing videos, perfect for a midweek distraction. If you don't get the newsletter, be sure to sign up today!

    What is Black Spot?

    Joel La Follette - Wednesday, May 03, 2017

    This photo of a Deschutes Bull Trout infected with Black Spot was taken by Nick Wheeler on May 1st on the Warm Springs to Trout Creek section of the Deschutes. 

    A few weeks ago I mentioned that a parasite that infects salmonids was becoming more prevalent in the Deschutes with many anglers reporting catches infected with the telltale “black spots.” To answer some the questions floating around I turned to biologist Greg McMillan and asked “Just what is Black Spot and why are we seeing an increase in cases in the Deschutes?”

    Greg responded, "Black spot disease is caused by a flatworm (trematode) parasite known in the scientific community as Uvulifer ambloplitis, and also known as “neascus”.  This parasite has a complicated life cycle that starts with eggs in water, which hatch and become juveniles known as miracidia, which in turn infect aquatic snails.  In snails this form of the parasite matures into the next life form, known as cercariae.  Cercariae are shed by the snails and become free swimmers, which attach to fish.  Once the cercariae have attached to the flesh of fish, the fish develops an immune response that causes the dark spot.

    Kingfishers are the next host, which become infected when they ingest infected fish.  The cercariae develop into adult flatworms.  The parasite then produces eggs, which are shed in feces by kingfishers, and deposited in water where the life cycle is reinitiated.

    These flatworms do not appear to be fatal to fish, or other hosts.  There are scattered reports of fish stressed from other sources dying while infected.  No human infections have been reported, but there is no real surveillance mechanism to detect human infections.  Although probably safe for human consumption after thorough cooking, there is no study data to confirm that.

    None of us who have fished the lower Deschutes River for decades can say that we’ve seen many, if any fish with this condition until a year ago.  There are reports indicating there have been infected fish in the lower Deschutes River and tributaries in the past, but they aren’t common.  So what has changed?  Is this random?  Or linked to the ongoing ecological changes we are all seeing in the lower river?

    This might be related to an increase in the snail population in the lower Deschutes River. Portland General Electric’s Year 1 Data Summary Report from their Lower Deschutes River Macroinvertebrate and Periphyton Report Study published in 2014, indicates that there has been a significant increase in snail populations in the lower Deschutes River.  This increase in population in the intermediate host (snails) might be related to the increase in black spot disease noted in fish.  The snail population increase is likely linked to the increase in algae in the lower river.

    Is this a catastrophic occurrence?  Probably not, but it could be another indication of ecological change in the lower Deschutes River."

    As Greg said, Black Spot is probably not catastrophic, but it is of concern. Finding out more information on the disease occurrence in Oregon is hard as it seems to not be of concern to ODFW at this time. Perhaps if more cases are reported by anglers, ODFW will finally take notice and look into the cause of this increase in cases. 

    I would suggest that anglers fishing the Deschutes carefully photograph and report cases of Black Spot to ODFW. Take note of where the catch was made and how many cases were observed. Please make an effort to leave fish in the water when handling and photographing them. If you send a photo of infected fish to me I'll add it to this blog post. Again, please handle all wild fish with respect and care.

    Contact Us

    21570 Willamette Drive West Linn, OR 97068

    2014 Royal Treatment Fly Fishing
    Privacy | Legal