How the fish was listed as endangered  

   It had been 18 years since any significant increase was recorded in sucker populations in Upper Klamath Lake.

   When the Klamath Basin was a sprawling wetland and floodplain, with more than 350,000 acres of potential habitat for the sucker, the fish lived in many areas connected by the Klamath River and its tributaries. Dams were erected, irrigation channels dug and wetlands drained, altering the landscape and reducing the habitat and connectivity of that habitat throughout the watershed, according to the Federal Register.  

   Numbers

   Concern about the health of these fish prompted collection efforts and documentation. It was estimated, based on spawning run counts, that 23,123 Lost River suckers were living in Upper Klamath Lake in 1984. By 1985, that population had declined to an estimated 11,861.

   In 1984, 2,650 individual shortnose suckers were estimated to live in the lake. In 1985 and 1986 there were too few shortnose suckers found   during the spawning run to estimate how many were left.

   13 comments

   The Fish and Wildlife Service proposed in August 1987 listing the shortnose and Lost River suckers as endangered species. Public notice throughout the region garnered just 13 comments, and none opposed listing the fish.

   The criteria for listing a species under the Endangered Species Act include: The presence or threatened destruction, modification or curtailment of its habitat or range; overutilization for commercial, recreational, scientific or education purposes; disease or predation; inadequacy of existing regulatory mechanisms; and other natural or man made factors affecting its continued existence.  

   The determination that added the sucker to the Endangered Species list was based on a limited amount of existing data about the fish and its decline. “Causes of the decline are varied and not fully understood,” it states. “Clearly, there has been a drastic reduction in spawning success.”

   Spawning grounds

   One thing was certain. A dam upstream of the confluence of the Sprague and Williamson rivers near Chiloquin likely eliminated 95 percent of the fish’s spawning grounds, according to the Federal Register listing, and fish ladders   placed on the Sprague River dam did little to aid in fish passage.

   The dam was removed last year to increase the upstream spawning habitat available   to suckers from Upper Klamath Lake. It is believed the dam’s removal will provide as much as 80 miles of spawning grounds, according to the Federal Register listing.  

Side Bar

Where the sucker makes its home     

   The endangered Lost River and shortnose suckers can be found in Upper Klamath Lake and its tributaries: Williamson River, Sprague River, Sycan River, Wood River, Crooked Creek and Crystal Creek. Suckers also can be found in Tule Lake and its tributaries, Lost River and Miller Creek, and in Clear Lake and its tributaries, Willow Creek and Boles Creek.

   In addition, suckers have been located in Link River and Lake Ewauna, Keno Reservoir, JC Boyle Reservoir, Copco Reservoir, Iron Gate Reservoir and Gerber Reservoir (shortnose only).  

   The fish historically lived in Sevenmile Creek, Fourmile Creek, Lake of the Woods, Lower Klamath Lake and Sheepy Creek.

   According to the 1988 Federal Register listing, the population of suckers living in Lake of the Woods was lost in 1952 during a fish eradication program aimed at removing carp and perch from the lake.

   The populations in Sheepy Lake, Lower Klamath Lake and Tule Lake were lost in 1924 when the lakes were drained for farming. The Lost River suckers living in Clear Lake are the last known population of the species from the Lost River system.

   — Information from U.S. Fish and Wildlife Service