Lake & Waterway Management – Aquarius-Systems

Rotorua Lake Weed Odor Sparks Calls for Preventative Management

Thu, 11 Dec 2025 18:12:15 +0000

Rotting lake weed and dead fish are causing a strong odor along Rotorua’s lakefront as a 70-tonne-per-day clean-up continues. Businesses report guests are complaining or staying away, highlighting the impact on the city’s reputation.

The piles of weed surfaced two weeks ago after strong winds disturbed the lakebed. The Bay of Plenty Regional Council began removal on 14 November, with Rotorua Lakes Council handling disposal. Ongoing weather fluctuations have worsened the smell, prompting calls for increased investment in preventative weed management to protect both the lake and Rotorua’s visitor experience.

Long-Term Aquatic Plant Management on Lake Ripley

Fri, 21 Nov 2025 17:48:07 +0000

Misconceptions About Lake Health and the Risks of Chemical Treatments

Wed, 01 Oct 2025 15:32:25 +0000

Lakes across the country are struggling with harmful algal blooms, low oxygen, and declining fish populations. While these problems are often obvious at the surface, many management practices are based on misconceptions that don’t address the real causes. Instead of solving the issue, they often make lakes even sicker.

Chemical Treatments: A Short-Term Fix That Makes Things Worse
Many lake managers turn to algaecides and herbicides to control harmful algae. On the surface, these treatments may look effective, but the reality is very different.

When algae are killed by chemicals, the cells release toxins directly into the water. The dead material then sinks, decomposes, and consumes oxygen—creating hypoxic conditions that stress or kill fish. Low oxygen also triggers internal nutrient release from sediments, fueling the very blooms that the chemicals were meant to stop.

Instead of restoring balance, chemical treatments can lock lakes into a cycle of recurring blooms and declining water quality.

Looking at the Surface Isn’t Enough
It’s common to judge a lake’s health by what can be seen at the surface—clear water, healthy oxygen levels near the top, or visible fish. But many lakes stratify, with deeper waters cut off from oxygen. While the surface looks fine, the bottom layers can be oxygen-depleted and nutrient-rich.

Fish crowded near the surface aren’t thriving—they’re escaping conditions that are deadly below.

Runoff Isn’t the Only Problem
Nutrient runoff from land is an important driver of algae, but it’s not the only one. Sediments at the bottom of lakes often act as storage banks for phosphorus and nitrogen. When oxygen levels drop, these nutrients are released back into the water, feeding new blooms year after year.

Focusing only on reducing runoff misses the internal nutrient cycle already at work inside the lake.

The Limits of Simple Metrics
Common tools like the Trophic State Index (TSI) are often used to measure lake health. But they mostly track surface-level data like clarity and nutrient concentrations. These numbers don’t reveal what’s happening in deeper waters, or how sediments and oxygen loss are driving long-term decline.

A Call for Smarter Lake Management
The misconceptions around lake health—and the overreliance on chemicals—are keeping many lakes stuck in poor condition. Chemical treatments may offer short-term relief, but they create long-term problems.

To break the cycle, management strategies need to focus on oxygen restoration, sediment nutrient control, and ecosystem balance. Prevention and smarter monitoring are also key to creating lakes that are resilient, healthy, and able to support aquatic life for generations.

Decomposing Weeds After Spraying Kills Fish in Lake

Tue, 29 Jul 2025 16:34:36 +0000

Residents around Indian Lake in Worcester, Massachusetts, are raising concerns after a spike in fish deaths following the recent application of aquatic herbicides. These chemicals, intended to control the spread of invasive weeds, work by killing the plants outright. But once the plants die, they begin to decompose in the water—a process that consumes dissolved oxygen. As oxygen levels drop, fish and other aquatic life can no longer survive, resulting in visible fish kills along the shoreline.

This chain reaction—herbicide application, plant decay, and oxygen depletion—has become a growing concern for communities trying to balance weed control with aquatic health. Indian Lake residents voiced frustration over poor communication from city officials, especially after seeing and smelling the aftermath of the July 2025 treatment. This incident underscores the environmental risks of chemical plant control and the importance of considering non-chemical alternatives like mechanical weed harvesting.

Read More https://www.telegram.com/story/news/2025/07/22/dead-fish-herbicides-communication-discussed-at-indian-lake-meeting/85306476007/?gnt-cfr=1&gca-cat=p&gca-uir=true&gca-epti=z118908p000650c000650d00—-v118908d–79–b–79–&gca-ft=234&gca-ds=sophi

Chemical Spraying Causes Major Fish Kill in Florida Canal

Tue, 15 Jul 2025 18:18:06 +0000

Following a chemical treatment aimed at controlling aquatic vegetation in Port St. Lucie’s Elkhorn Canal, residents reported what they called the “worst smell in the entire world” as countless fish perished on the canal’s surface. Water tests revealed that dissolved oxygen levels plunged to levels unsustainable for aquatic life—an unintended but severe consequence of the applied chemicals.

Critics argue that proper dissolved-oxygen testing should have been completed before treatment—something the contractor failed to do. Environmental advocates now recommend exploring safer alternatives, such as mechanical harvesting or biological controls, to manage vegetation without triggering oxygen depletion or fish kills.

When Waterway Management Turns Harmful

Mon, 30 Jun 2025 18:12:20 +0000

In June 2024, a chemical herbicide application in Florida’s Elkcam Waterway resulted in a catastrophic fish kill. Within 24 hours, residents reported fish gasping at the surface, and by the end of the week, thousands of dead fish had washed up along the banks.

This devastating incident underscores the dangers of using chemicals to manage aquatic vegetation. While herbicides can offer a quick solution, the long-term damage can be severe—destroying ecosystems, harming wildlife, and raising health concerns for nearby communities.

The fish lost in Port St. Lucie were part of a balanced aquatic system that also supported birds, turtles, and other species. The sudden collapse of this environment sparked outrage and concern among residents who now question the safety and sustainability of chemical treatments.

Fortunately, there is a better way. Mechanical harvesting offers an eco-friendly, chemical-free method of aquatic weed control. It physically removes vegetation from the water without introducing toxins or disrupting the ecosystem. This method not only preserves water quality but also protects the fish, plants, and wildlife that depend on healthy aquatic habitats.

Whether managing a private lake, public waterway, or residential canal, mechanical harvesting is a responsible, sustainable solution. It’s an effective alternative for those who care about long-term water health and want to avoid the risks of herbicide use.

Milwaukee, Wisconsin: Leading the Charge as a Global Water Hub

Tue, 28 Jan 2025 18:26:51 +0000

Milwaukee, a city steeped in history and industry, is emerging as a global leader in addressing one of humanity’s most pressing challenges: water. As the world faces growing concerns over water scarcity, contamination, and climate resilience, Milwaukee has positioned itself at the forefront of innovative solutions. Through strategic investments, world-class institutions, and a commitment to sustainability, the city has earned its reputation as “Water Forward.”

The Freshwater Capital of the World

Located on the shores of Lake Michigan, one of the largest freshwater bodies on the planet, Milwaukee has long recognized the value of water as a vital resource. The city’s proximity to this vast freshwater supply provides not only a critical natural asset but also a responsibility to protect and manage it wisely. This understanding has driven Milwaukee to establish itself as a center of excellence for water research, technology, and innovation.

The Global Water Center

At the heart of Milwaukee’s water innovation efforts lies the Global Water Center, a state-of-the-art facility that serves as a hub for research, collaboration, and entrepreneurship. Opened in 2013, this cutting-edge center brings together academic researchers, startups, established businesses, and policymakers to develop solutions for water-related challenges. From advanced filtration technologies to sustainable wastewater management practices, the Global Water Center is a beacon of hope for regions grappling with water crises.

A Thriving Water Technology Cluster

Milwaukee’s water technology sector is one of the fastest-growing in the world. The city is home to The Water Council, an organization that connects water-focused businesses and institutions to drive innovation and economic growth. By fostering collaboration among its members, The Water Council has helped Milwaukee attract global companies and startups eager to tackle issues like water scarcity, pollution, and climate adaptation.

Academic Excellence and Research

Milwaukee’s educational institutions play a pivotal role in its water-forward strategy. The University of Wisconsin-Milwaukee’s School of Freshwater Sciences is the only graduate school in the United States dedicated solely to the study of freshwater. This world-renowned institution trains the next generation of scientists and engineers, equipping them with the skills to address global water challenges.

Sustainability in Action

Milwaukee’s commitment to sustainability extends beyond research and innovation. The city has implemented practical measures to improve water quality and resilience. Initiatives like green infrastructure projects, stormwater management systems, and river restoration efforts showcase Milwaukee’s dedication to protecting its waterways while reducing environmental impact.

A Global Model for Water Solutions

Milwaukee’s water-forward approach has not gone unnoticed. The city has become a model for other regions seeking to address their own water challenges. By leveraging public-private partnerships, investing in education and technology, and fostering a culture of collaboration, Milwaukee demonstrates how cities can take proactive steps to secure their water future.

Facing the Future with Confidence

As the global demand for clean, accessible water continues to grow, Milwaukee stands ready to lead. By harnessing its unique assets, fostering innovation, and maintaining a commitment to sustainability, the city exemplifies what it means to be a global water hub. Milwaukee is not just addressing today’s water challenges—it is shaping the future of water for generations to come.

Chloraminated Water Causes Massive Fish Kill in Minnesota

Thu, 19 Sep 2024 15:01:09 +0000

The Minnesota Pollution Control Agency released new information regarding its ongoing efforts to determine what caused a massive fish kill in Duluth’s Tischer Creek in August.

MPCA Communications Specialist Beverly Godfrey says the city of Duluth drained an estimated 1.7 million gallons of chloraminated water into the creek from the Woodland Reservoir over a 15-hour period as part of a maintenance operation for the city’s drinking water system. Chloraminated water is drinking water that has been treated with chloramine, a disinfectant that’s made by combining chlorine and ammonia.

Chloramine is more stable than chlorine, so it can protect water from bacterial regrowth for longer, it produces fewer disinfection byproducts than chlorine and has a less noticeable chlorine odor and taste.

Wake Boarding Restrictions On Wisconsin’s Deepest Natural Inland Lake

Fri, 12 Jul 2024 14:16:42 +0000

The deepest natural inland lake in Wisconsin is the latest to take up the issue of wake boating.

A wake boating advisory has been issued by the municipalities that surround Green Lake.

Wake boats have special tanks allowing them to create larger wakes than other boats. The advisory asks wake boaters to operate in wake mode in a minimum depth of 40 feet of water and stay at least 700 feet from shore.

According to the DNR, Green Lake has a maximum depth of roughly 236 feet.

The recommended area is outlined on a map from the Green Lake Association. This leaves 60% of the lake available for wake surfing.

The advisory comes following a recent study by the University of Minnesota, which looked at how wake surfing can kick up lake sediment, erode shorelines and potentially transport invasive species.

Apple River District Removes Millions of Pounds of Curly-Leaf Pondweed

Thu, 21 Dec 2023 18:20:55 +0000

The strategy of the Apple River Protection and Rehabilitation District was to remove as much of the curly leaf pondweed as possible early, then systematically move up and down the Flowage keeping the main navigation channel clear plus providing access channels to the resident along the shoreline whenever practical.

Operating under the strict rules of a permit authorized by the Wisconsin Department of Natural Resources the harvester begin cutting on May 28th and operations ceased on August 29th. During this time the aquatic plant harvester collected 566 loads of weeds, measuring approximately 155,650 cubic feet in volume, and weighing about 2,535,680 pounds.

Due to its high nutrient content, the harvested weeds make excellent fertilizer and are put to good use by local growers and organic farmers in the area.