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AIS / Fisheries

AIS September 2014 : Mystery Snails

Best Detected by walking your shoreline because when snails die, their shells wash up on shore.

Habitat Requirements

Prefer shallow highly productive lakes and slow-moving streams with soft mud, silt, or sand substrate
Productive systems provide minimum calcium requirements for shell growth
Feed non-selectively on organic and inorganic bottom material, diatoms, and algae
Prefer pH of 6.3-8.5, dissolved oxygen 7-11 …

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AIS August 2014 : Eurasian Water Milfoil

Submersed aquatic plant with 3-4 feather like leaves arranged in a circle around the stem. Each feather-like leave has 12 or more pairs of leaflets whereas native Northern water milfoil has less than 10 pairs. Monitoring and prevention are key to controlling the spread!


Submersed aquatic plant
3-4 feather-like leaves in circle around stem
Leaves are divided into …

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AIS July 2014 : Purple Loosestrife

Best Detected when blooming in late July and early August. Plants have angular stems, usually opposite pairs of leaves, and multiple magenta flower spikes. Best controlled by biological control, Galerucella weevils, which are propagated and then released in July.


Hardy perennial found in moist soil: wetlands, stream/river banks, lake shores, and disturbed
Established plants tolerate dry conditions:roadsides, …

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Purple Loosestrife Project

Thanks to those of you who reported infestations of Purple Loosestrife along Chain shores. The identified areas were on Wild Rice Lake, Stepping Stones Lakes, an area near Rest Lake, and on the river leading into lsland Lake. Work is now underway to treat those areas with beetles known to kill this invasive plant.

Pat Egan …

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AIS June 2014 : Curly-Leaf Pondweed

Best Detected in the spring because it forms new plants under the ice in the winter, making it one of the first aquatic plants to emerge in the spring. Best controlled in the spring or early summer when native species are still dormant and temperatures are low enough for endothal herbicides to be effective.


Found in alkaline, high …

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Mystery Snails

There actually is a large snail dubbed “Chinese Mystery Snail.” They were introduced into inland lakes from home aquariums and bait buckets, and from boats with exposure to larger lakes where ships’ ballast water has been dumped. The UW-Madison Center for Limnology surveyed 45 Wisconsin lakes and found these snails in 40%. They warn that …

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