New Zealand Mudsnails discovered in new locations

The Wyoming Game and Fish Department recently confirmed new findings of New Zealand mudsnails in both the North Platte River near Casper and the Salt River south of Alpine.

10/22/2018 2:24:05 PM

Cheyenne -

The Wyoming Game and Fish Department recently confirmed new findings of New Zealand mudsnails in both the North Platte River near Casper and the Salt River south of Alpine. New Zealand mudsnails are an aquatic invasive species (AIS) that have spread throughout the Greater Yellowstone Ecosystem and now persist in several water bodies in the northwest part of the state, but this is the first finding on the North Platte River.
New Zealand mudsnails are non-native snails that pose some issues for fisheries. They can alter water chemistry through filter feeding and reproduce at rapid rates. They crowd out habitat suited for stoneflies, caddisflies and other insects that are important food for trout. The New Zealand mudsnail is able to shield itself from toxins in the water, making chemical eradication of the species impossible.
“New Zealand mudsnails are easily transported on waders and drift boats. Not taking the time to Clean, Drain, Dry between waters likely led to these new infestations,” states Eric Hansen, Game and Fish AIS specialist in Casper.  
While the Game and Fish AIS program focuses on intercepting invasive species like zebra and quagga mussels from out of state, this is a good reminder for water users traveling to different waters within Wyoming that they must also Clean, Drain and Dry to prevent moving harmful species like New Zealand mudsnails and curly pondweed.  
Hansen adds, “Complacency will not prevent the further spread of these damaging organisms.  It will take action, concern, and care for our fisheries and recreation waters to stop an even more rapid escalation of invasive species in the future. Realizing that a simple task like cleaning your equipment, draining all standing water no matter how minimal and drying everything after each use will help exponentially in slowing the progress of these unwanted, water spoiling invaders.”
Game and Fish will continue to monitor the population and conduct further sampling to determine the breadth of the infestation.

(Renny MacKay- (307) 777-4594)

- WGFD -

  • information

Notice: Wyoming watercraft registration closing for fall

The Wyoming Game and Fish Department will be closing the 2021 watercraft registrations and preparing for the 2022 season during the month of October.

Continue reading...

Wyoming Seeks State Management of Grizzly Bears

Governor Gordon stresses Wyoming’s expertise in meeting benchmarks, managing iconic species.

Continue reading...

Game and Fish tracking EHD in deer, pronghorn

Transmission likely to continue until first frost

Continue reading...

Buy a Super Tag ticket in September for a chance to win custom bow

Win a customizable Mathews V3-31 bow, donated by Mathews Archery.

Continue reading...

Game and Fish Commission continues support of construction projects

The Wyoming Game and Fish Commission met for a one-day meeting in Douglas.

Continue reading...

Lek counts decrease in 2021

Influenced by chick survival, dry conditions

Continue reading...

Hunters: Submit CWD samples

Hunters are an important component in helping Game and Fish understand the disease and achieve CWD monitoring goals.

Continue reading...

Email Newsletter

Email Newsletter Sign Up

Stay up to date on all Wyoming Game and Fish news either by email or text message. Click the link below to get started.

Sign Up Today


Conserving Wildlife - Serving People