APPENDIX C: AIS threats to the Flathead River Basin
Species |
ANS Priority Class2 |
Legal status3 |
|---|---|---|
Fish |
||
| Asian carp species (bighead, grass, silver,
and black) |
1 | Prohibited |
| Black bullhead | 4 | Unclassified |
| Eurasian ruffe | 1 | Prohibited |
| Lake trout | 4 | Unclassified |
| Northern snakehead | 1 | Prohibited |
| Brook trout | 4 | Unclassified |
| Rainbow trout4 | 4 | Unclassified |
| Brown trout | 4 | Unclassified |
| Largemouth Bass | 4 | Unclassified |
| Walleye | 4 | Unclassified |
| Northern pike | 4 | Unclassified |
| Pumpkinseed | 4 | Unclassified |
| Lake Whitefish | 4 | Unclassified |
| Round goby | 1 | Prohibited |
| Tench | 1 | Unclassified |
| Walking catfish | 1 | Prohibited |
| Yellow perch | 4 | Unclassified |
| White perch | 1 | Prohibited |
| Zander | 1 | Prohibited |
Amphibians |
||
| African clawed frogs | Prohibited | |
| North American bullfrog | Prohibited | |
Mollusks |
||
| New Zealand mud snail | 1 | Prohibited |
| Quagga mussel | 1 | Prohibited |
| Zebra mussel | 1 | Prohibited |
| Crustaceans | ||
| Rusty crayfish | 1 | Prohibited |
Plants |
||
| Eurasian watermilfoil | 3 | |
| Curley leaf pondweed | 4 | |
| Flowering rush | 4 | |
| Yellow flag iris | 4 | |
Parisites and Pathogens |
||
| VHS virus | 1 | |
| Whirling disease | 2 | |
Mammals |
||
| Nutria | 1 | Prohibited |
2 Priority classes were adapted from the Statewide ANS Management Plan.
3 Classification in Exotic Wildlife Administrative Rules ARM 12.6.2220.
4 Lake trout and rainbow trout do pose significant impacts to native fish within the Flathead River Basin.
Management strategies are utilized in some locations to control their populations. Continued
management is encouraged and prevention of spread to new areas is essential to limit further impacts to
native species.
Priority Class 1
These species are not known to be present within the Flathead Basin, but have a high
potential to invade. Limited or no known management strategies for these species
exist. Appropriate action for this class includes prevention of introductions and
eradication of pioneering populations.
Priority Class 2
These species are present and established within the Flathead Basin and have the
potential to spread further. Limited or no known management strategies for these
species exist. These species can be managed through actions that involve mitigation of
impact, control of population size, and prevention of dispersal to other waterbodies.
Priority Class 3
These species are not known to be established in the Flathead Basin and have a high
potential for invasion. Appropriate management techniques are available and include
prevention of introductions and eradication of pioneering populations.
Priority Class 4
These species are present and have the potential to spread within the Basin, but
management strategies exist for these species and include mitigation of impact, control
of population size, and prevention of dispersal to other waterbodies.
