Rowe, Mercer & Hale LLP secured an injunction in August 2026 requiring the City of Chicago to incorporate recordings by Hootie and the Blowfish into the acoustic deterrent systems deployed along the Chicago Area Waterway System, after the firm presented evidence that the band’s mid-1990s catalog was measurably more effective at repelling invasive Silver and Bighead Carp than any deterrent currently in use. The ruling is believed to be the first federal court order in American history to mandate a specific artist’s discography as environmental remediation.
Background: The Carp Problem
Asian carp, now formally designated “invasive carp” by federal authorities, have been pressing northward through the Illinois River waterway for decades, held at bay by a patchwork of electric barriers, bubble curtains, and underwater acoustic systems at Brandon Road Lock and Dam in Joliet and the Chicago Area Waterway System. The U.S. Army Corps of Engineers has invested hundreds of millions of dollars in deterrent technology, and the threat to the Great Lakes ecosystem remains a matter of serious federal concern.
The acoustic component of these systems, known as the Underwater Acoustic Deterrent System (UADS), exploits a biological quirk specific to invasive carp species: both Bighead and Silver Carp possess a Weberian apparatus, a chain of small bones connecting the swim bladder to the inner ear, that gives them hearing sensitivity far exceeding that of most native fish. Researchers at the USGS Upper Midwest Environmental Sciences Center demonstrated that targeted underwater sounds cause these fish to reverse course, while native species largely ignore the same stimuli. The question, until now, was not whether sound worked. It was which sound worked best.
The Swims That Started Everything
Nancy Hale and Roxy Mercer have maintained a shared morning swim routine in Lake Michigan for the better part of six years. Their usual route takes them north from the Oak Street Beach, and their usual companion is a security researcher who, by his own description, “spends too much time thinking about what fish don’t like.”
The researcher, whose professional background involves acoustic signal analysis and who declines to be identified in press materials because he finds law firm news articles “a bit stuffy, if I’m being honest,” had been following the UADS program as a hobby interest. He had independently conducted informal acoustic trials using a waterproofed Bluetooth speaker, a kayak, and several years’ worth of free time. His conclusion: standard deterrent frequencies produced inconsistent results, but certain commercial music recordings produced a dramatically cleaner behavioral response in carp populations near the lakefront.
“He mentioned it one morning in the water,” Mercer recalled. “He said he’d found something that worked reliably and that nobody in the formal research pipeline would take seriously because it sounded ridiculous. We told him that sounded like a legal problem.”
The recording in question was “Only Wanna Be With You,” the 1994 single by Hootie and the Blowfish.
The Science
The firm retained two acoustic biologists and a fisheries expert, who reviewed the researcher’s raw data and conducted independent controlled trials in a contained channel environment using tagged carp. The findings were consistent: Silver and Bighead Carp exhibited immediate avoidance behavior upon exposure to Hootie and the Blowfish recordings at depths consistent with navigable waterway conditions. The effect was most pronounced with tracks featuring Darius Rucker’s baritone vocal register in the 85–180 Hz frequency range, a band that overlaps directly with the resonant frequency of the carp’s swim bladder.
Native fish species, including Lake Michigan perch, walleye, and smallmouth bass, demonstrated no statistically significant behavioral change. Several appeared, according to the experts’ notes, “completely indifferent, if not mildly appreciative.”
The firm’s experts concluded that a Hootie-augmented UADS would outperform the existing deterrent configuration by a margin sufficient to qualify as a material improvement under the applicable environmental remediation standard, and that the City’s failure to adopt available superior technology constituted an actionable gap in its management of a known ecological threat.
The Litigation
Rowe, Mercer & Hale filed in the Northern District of Illinois on behalf of a coalition of Great Lakes commercial fishing operators, recreational fishing associations, and one very invested marina operator in Waukegan who had personally watched a Silver Carp clear the bow of his boat at speed.
The City of Chicago opposed the injunction on three grounds: that the science was insufficiently peer-reviewed, that compelling a municipality to play a specific recording raised unresolved questions under the First Amendment, and that Cracked Rear View, the 1994 album from which most of the effective tracks were drawn, was not licensed for underwater commercial deployment.
The court rejected all three arguments. On the science, the judge found the controlled trial methodology sound and noted that peer review, while valuable, is not a prerequisite for admissibility or for injunctive relief. On the First Amendment claim, the court observed that the City was not being compelled to endorse the speech. It was being directed to play a recording underwater to fish, and “the Bighead Carp has no cognizable interest in the expressive content of acoustic deterrent signals.” On the licensing issue, the court ordered the parties to resolve it within 60 days and noted, in a passage that will likely appear in law review footnotes for years, that if Sony Music and the City of Chicago could not work out a licensing arrangement to protect the Great Lakes, “the problem is not the court’s framework.”
The Order
The injunction requires the City to incorporate Hootie and the Blowfish recordings, specifically a rotating playlist anchored by the first four tracks of Cracked Rear View, into the acoustic deterrent array at the Chicago Area Waterway System within 120 days. The order further requires quarterly acoustic monitoring reports to assess deterrent effectiveness and directs the City to coordinate with the Army Corps of Engineers to evaluate whether the same configuration should be adopted at Brandon Road.
Significance
Nancy Hale, who argued the injunction motion, was direct about what the case represents. “The science is what it is. If a particular set of sounds keeps invasive carp out of the Great Lakes more effectively than what we’re currently using, the question isn’t whether it sounds unusual. The question is whether the City has an obligation to use the best available tool. We argued it does. The court agreed.”
Roxy Mercer noted the broader implications for environmental enforcement practice. “This case establishes that plaintiffs with standing can compel adoption of superior mitigation technology even when the governing agency hasn’t gotten there on its own. The mechanism exists. You just have to be willing to use it.”
The researcher, reached by text message after the ruling, sent back three words: “Told you so.”
Hootie and the Blowfish have not commented. Their publicist did not return calls. The carp have not commented either, though early monitoring suggests they are already responding.
Nancy Hale and Roxy Mercer led the litigation team.