IDAHO, USA — Ever since the invasive quagga mussel was found in Idaho in the early 2000's, the state has been working to eradicate it. Hower, the species is, well invasive, and the work has been slow and difficult. There has also been a new spread since the early days, with the mussel moving through areas of the Snake River in 2023.
The Idaho State Department of Agriculture (ISDA) is working on a multi-faceted treatment plan to end the quagga saga using the aggressive application of the chelated copper (Natrix). The most recent being an 8.5-mile section of the Snake River.
"ISDA staff and partners diligently monitored copper levels at 51 sampling sites in the river throughout the dissipation area 24 hours a day for the entirety of the treatment. Treatment was challenged by deep pools, waterfalls and hydropower facilities. Significant effort was focused on monitoring the treatment application in these areas that varied in depth to ensure the proper concentration of the product was maintained throughout the varying depths and features of the river," a news release stated.
The department reported that changes were observed after the treatment, including changes to the river's colors, and an impact on plant and aquatic life.
"Overall, fish mortality was limited. Sentinel species, including non-native Asian clams, were planted in strategic locations throughout the treatment area in order to better assess the effectiveness of the treatment. ISDA staff are currently evaluating the impact of the treatment to the sentinel species," the release stated.
During the treatment last year, many fish were killed and ISDA chose not to stock the affected areas with fish to minimize this year's impact.
The next treatment is scheduled for November. For more information on fish mortality and the mussel treatment plan, people can contact the Idaho Department of Fish and Game's website.
