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Colorado Parks and Wildlife is planning to stock several thousand large, whirling disease resistant Hofer rainbow trout into a section of the Colorado River where a large, natural fish kill occurred earlier this year, the agency reported in a news release.
Wildlife managers will begin stocking operations on Tuesday between Dotsero and the Cottonwood boat ramp.
After a heavy, monsoonal downpour last July, a large amount of silt and debris was washed into the Colorado River below Dotsero and through the Glenwood Canyon, eventually killing several thousand fish in this section, according to the news release.
“We have received recent reports from anglers that fishing has been unproductive and trout seem to have declined since the fish kill," said Aquatic Biologist Kendall Bakich in the release. "Stocking these Hofer rainbows will not only replenish the population, it will establish a whirling disease resistant fish that anglers can enjoy into the future."
Whirling disease, a serious physical condition in some species of trout and salmon, is caused by a parasite found in the water. Severely infected young trout often develop deformities of the skull and spinal column. In some areas of Colorado, most of the young wild rainbow trout die 3 - 6 months after infection, the release stated.
"The fish kill in July was unfortunate, but it has provided an opportunity to stock this disease resistant strain of rainbow trout," said Perry Will, Area Wildlife Manager in Glenwood Springs, in the release. "Anglers fishing in this section of the Colorado River will certainly benefit from this effort."
Hofer rainbow trout originated from the Kamloops rainbow trout found in the Columbia River system. In the late 1800s, these fish were transported to Germany where they were grown as food fish in local hatcheries, according to the release.
Because whirling disease is common in Germany, the fish were reared in whirling disease-positive waters. Over time, this strain developed a resistance to the parasite, the release stated.
For more information, please visit http://wildlife.state.co.us/Fishing/Management/Pages/WhirlingDisease.aspx
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