The Wild Mile floating wetland in the Chicago River, October 2022. (Patty Wetli / WTTW News)

Researchers from Shedd Aquarium and Chicago-based Urban Rivers teamed with counterparts in Boston and Baltimore and confirmed that floating wetlands can improve water quality and provide vital habitat.

(WTTW News)

It will be up to the next mayor to decide how to respond to Chicagoans’ growing frustration with these mega-events.

A sucker tagged and released for study in a new research project. (Courtesy Shedd Aquarium)

Shedd researcher Karen Murchie has been singing the praises of suckers for years in service of drawing more attention to the overlooked fish. Now the broader scientific community is taking note. 

Granddad, in livelier days at the Shedd Aquarium. (Shedd Aquarium)

We all knew that Granddad, the Shedd Aquarium’s long-lived Australian lungfish, was an old-timer. Now, five years after he shuffled off to the big fish tank in the sky, Granddad’s true age has been revealed.

Lumpsuckers at the Shedd Aquarium. (Shedd Aquarium)

The Shedd Aquarium recently welcomed a group of lumpsuckers, a fish that’s weird in so many ways, it’s hard to know where to start.

Fish species diversity has been increasing in the Chicago River. (Shedd Aquarium)

Back in the 1980s, the number of fish species found in the Chicago River could be counted on a single hand. Today, that number is up to 60 species, an increase in diversity that can be directly attributed to a decrease in wastewater pollutants, according to a new study from the Shedd Aquarium.

A bighead carp, like the one caught in the Humboldt Park lagoon. (Evan Garcia / WTTW News)

When a fish the size of a 10-year-old child was pulled from the Humboldt Park lagoon earlier this month, the reaction quickly went from “Oooh” to “Uh-oh.” The angler had reeled a whopper of an invasive bighead carp accidentally stocked 20 years ago. Are there more?

In 2015 Jamie Dalton started Aquarium Info, a blog to share information and tips to help others to start building their fish tanks. During the pandemic she decided to go a little further and transformed her second bedroom into a full functioning fish studio. (WTTW News)

Have you ever wanted to get a fish but had no idea where to start? We head to Wicker Park to meet Jamie Dalton, who began creating educational aquarium videos during the pandemic which led her to a new business venture.

In this Tuesday, Oct. 30, 2012, file photo, Kim Bertini looks over some of the 15,000 dead fish that washed up near her backyard on Lake Madeline in Galveston, Texas. (Jennifer Reynolds / The Galveston County Daily News via AP, File)

Oxygen levels have dropped in hundreds of lakes in the United States and Europe over the last four decades, a new study found. And the authors said declining oxygen could lead to increased fish kills, algal blooms and methane emissions.

The Field Museum has more than 2 million fish in its research collections. (Patty Wetli / WTTW News)

Millions of specimens collected by the Field, not for exhibits but for scientific study, are unlocking mysteries of evolution and could answer questions about climate change.

The Little Calumet River. (Charles Morris / National Park Service)

Can you put a price tag on damaged natural resources?

State and federal agencies are still assessing how much damage was done to natural resources in Northwest Indiana as a result of the 2019 discharge of hazardous chemicals into a Lake Michigan tributary.  

A massive sturgeon, caught May 2021 in the Detroit River. (Jason Fischer / U.S. Fish and Wildlife Service)

The 240-pound, 100-year-old, nearly 7-foot-long sturgeon is making headlines. But fish that size used to be common in the Great Lakes and maybe, thanks to restoration efforts, they will be again.

Specimens of the round goby were among the species included in the micro plastics study. (U.S. Fish and Wildlife Service / Eric Engbretson)

Working with specimens in the Field Museum’s collections, researchers from Loyola University Chicago found microplastics in fish dating back to the 1950s. “Plastic is everywhere,” the scientists said. 

A group of suckers on the move in Door County, Wisconsin, during a previous migration. (Courtesy of Shedd Aquarium)

Shedd Aquarium researchers are eagerly anticipating the spring migration of sucker fish, a species that could tell us about climate change.

What’s so special about this fish? It’s all about the little yellow tag. (Metropolitan Water Reclamation District)

A largemouth bass fished from the Skokie River provided proof of the success of a 2018 dam removal on the Chicago River.

A silver carp captured in June 2017 in the Illinois Waterway below the T.J. O’Brien Lock and Dam, about 9 miles from Lake Michigan. (Courtesy Illinois Department of Natural Resources)

If you can’t beat ‘em, eat ‘em. That’s the apparent strategy behind a new state grant program that will provide funding to companies that harvest and sell Asian carp.