Harmful Algal Blooms in Wisconsin Lakes Harmful algal blooms (HABs) are becoming increasingly common in Wisconsin lakes and ponds. These blooms can reduce water quality, impact recreation, harm aquatic ecosystems, and pose health risks to people and ...

Wisconsin’s lakes and ponds, whether you’re on Lake Winnebago, a small county lake in Vilas County, or a neighborhood pond near Madison, support rich aquatic ecosystems prized for fishing, boating, wildlife habitat, and scenic beauty. Yet these water...

As winter thaws across Wisconsin, pond owners, golf course superintendents and commercial property managers begin to see the first signs of spring and increased aquatic activity. While the transition may feel gradual, early spring is the most critica...

Spring is a critical season for lakes and ponds across Wisconsin, as rising temperatures and seasonal mixing, commonly called spring turnover, can dramatically affect water quality. Turnover occurs when the surface water warms and mixes with deeper l...

As spring arrives in Wisconsin, lake and pond owners have a key opportunity to manage aquatic invasive species (AIS) before peak summer growing season sets in. Invasive plants, shoreline vegetation, and aquatic animals can spread rapidly, disrupt eco...

Microcystis is a type of cyanobacteria that often forms thick, paint-like scums on lakes and pond surfaces, especially in nutrient-rich waterbodies. Certain strains release microcystin toxins that can be harmful to people, pets, and wildlife. Profess...

Algae are a natural part of healthy lake and pond ecosystems. Many types contribute positively—producing oxygen and forming the base of the aquatic food web. But when nutrient levels become unbalanced, algae can grow rapidly, turning clear water into...

Cattails are a common and important part of Wisconsin’s aquatic landscapes, offering food and shelter for fish, birds, amphibians, and insects. However, when non-native species like Narrowleaf Cattail (Typha angustifolia) and Hybrid Cattail (Typha x ...

Protect Your Lake from Invasive Aquatic Weeds with Spring Management Curly-leaf pondweed (Potamogeton crispus) is an aggressive, non-native aquatic plant that poses a serious threat to Wisconsin’s lakes and ponds. With its wavy, reddish-green leaves ...

By Joseph Berg Senior Aquatic Biologist, Fisheries Specialist Every spring, we hear many of the same questions and statements regarding ponds and fish. “Where are all of my fish?”, “I think all my fish were eaten”, “I don’t have any fish but I don’t ...