Tennessee Aquarium Reintroduction Biologist II Teresa Israel examines a critically endangered laurel dace before its reintroduction to the wild in March 2025. In July 2024, about 300 of these fish — considered by scientists to be among the most imperiled in North America — were rescued out of rapidly drying streams on Walden Ridge north of Chattanooga.  Tennessee Aquarium

Improving drought conditions on Cumberland Plateau enabled return of fish after 2024 rescue

Casey Phillips is a communications specialist at the Tennessee Aquarium in Chattanooga.

CHATTANOOGA — After being saved from near-certain extinction last summer and overwintering in the expert care of biologists at the Tennessee Aquarium, more than 230 critically endangered laurel dace are finally back where they belong.

Last July, a prolonged regional drought caused many Southeast Tennessee streams to dwindle and, in some cases, dry up entirely. Atop Walden Ridge north of Chattanooga, water flow ceased at Bumbee Creek and Youngs Creek, the last sites known to support populations of Chrosomus saylori, the laurel dace.

When conditions in these rapidly disappearing waterways reached a tipping point, the Aquarium led a series of emergency rescue operations to save as many of these red-bellied, highlighter-yellow-finned minnows as possible. In coordination with the Tennessee Wildlife Resources Agency and with assistance from the U.S. Fish and Wildlife Service and the University of Georgia, about 300 laurel dace — the majority left on the planet — were relocated into the safety of human care at the Tennessee Aquarium in Chattanooga and Wolf Creek National Fish Hatchery in Jamestown, Kentucky.

According to the most recent report from the USDA’s U.S. Drought Monitor, much of Southeast Tennessee is still experiencing moderate drought conditions. However, a slightly wetter-than-average February made it safe to return these rescued minnows to the wild.

Tennessee Aquarium VP and Chief Conservation and Education Officer Dr. Anna George, right, and U.S. Fish and Wildlife Service Conservation Delivery Coordinator Geoff Call collect critically endangered laurel dace from a stream ravaged by a prolonged drought on the Cumberland Plateau. The rescue successfully relocated 105 adults into human care at the Tennessee Aquarium Conservation Institute’s headquarters near downtown Chattanooga.  Photos by Doug Strickland/Tennessee Aquarium

Drought prompts emergency rescue of one of America’s most endangered aquatic species

Casey Phillips is a writer for the Tennessee Aquarium.

CHATTANOOGA — Few things trigger louder or more distressing alarm bells among freshwater biologists than watching a waterway dry up during a severe, prolonged drought. That’s especially true when the disappearing stream is home to one of America’s most imperiled fish.

In late July, reports of dramatically withered streams atop Walden Ridge north of Chattanooga spurred an emergency rescue operation to prevent the extinction of the federally endangered laurel dace, which scientists consider to be among the 10 most at-risk fish in North America.

This effort was carried out by representatives from the Tennessee Aquarium, the U.S. Fish and Wildlife Service, and the University of Georgia’s River Basin Center in coordination with the Tennessee Wildlife Resources Agency. In all, 105 adult laurel dace were removed from dangerously dry streams and successfully relocated to the Tennessee Aquarium Conservation Institute (TNACI) near downtown Chattanooga.

All but one of the collected fish survived the relocation and are now thriving in temporary human care, where they will remain until conditions in their few native streams are sufficiently improved for them to be returned safely.

This laurel dace (Chrosomus saylori) was among dozens other collected from a stream on Walden Ridge north of Chattanooga to save the fish from drought. In the last 12 years, this minnow’s range has drastically dwindled to just two streams, and scientists consider it one of North America’s 10 most imperiled fish species.

Representatives from U.S. Fish and Wildlife Service and the Tennessee Aquarium Conservation Institute work together to rescue Barrens Topminnows imperiled by an exceptional drought in Nov. 2016.  Tennessee Aquarium

Drought conditions threaten some of the nation’s most-endangered fish species

Casey Phillips is a communications specialist at the Tennessee Aquarium in Chattanooga.

CHATTANOOGA — The endless parade of sunny, cloudless days in Chattanooga for the last two months may seem like the stuff of dreams to anyone planning an outdoor activity. However, this fall has turned into a blue-sky nightmare for aquatic species living in smaller creeks and streams.

“Some of those headwater pools are going to dry up, and we’ll lose large numbers of populations,” said Dr. Bernie Kuhajda, an aquatic conservation biologist at the Tennessee Aquarium Conservation Institute. “It just doesn’t look good for our headwater fish communities out there. They’re really getting stressed.”

Less than half an inch (0.42 inches) of rain fell in Chattanooga during a 72-day span between Aug. 30 and Nov. 9, according to meteorological data recorded at Lovell Field. That’s just 0.16 inches more than fell in Death Valley, California, during the same period, according to the National Oceanic and Atmospheric Administration (NOAA).

As of the latest weekly report by the government’s U.S. Drought Monitor, most of Hamilton County is now considered to be experiencing a D4 or “exceptional” drought, the Monitor’s most severe drought category.

Bad news for endangered fish species like the Barrens Topminnow and Laurel Dace.

Conservation scientists with the Tennessee Aquarium Conservation Institute pose in the Tennessee River before releasing more than 600 juvenile lake sturgeon into the waterway. Tennessee Aquarium

CHATTANOOGA — After bulking up all summer on a steady diet of bloodworms and brine shrimp, hundreds of juvenile lake sturgeon finally were returned to their ancestral waters this morning. 

Under a nearly cloudless autumn sky, biologists from the Tennessee Aquarium Conservation Institute and third through fifth grade students from Girls Inc. of Chattanooga’s Fall Break Camp gathered on the north bank of the Tennessee River in Coolidge Park. 

One by one, they carefully made their way to the river’s edge holding clear, water-filled plastic buckets containing five-month-old lake sturgeon. Amidst excited squeals and nervous laughter, they squatted down, gently depositing each sleek, armor-skinned fish into the shallows.

This latest release “class” included 667 lake sturgeon. Comparatively tiny now, these miniature river giants have the potential to reach nine feet in length and could live for up to 150 years. 

Reintroduction events like this are the capstone payoff to a summer spent tirelessly caring for and — most of all — feeding these sturgeon, says Reintroduction Biologist II Teresa Israel. 

“It’s really special. It’s hard to see them go, but it’s a happy day since we’ve seen them get so big, so we know they’ll be successful out there,” she said. “It’s a great accomplishment that completes the circle for all our hard work.” 

Lake Sturgeon are considered endangered in Tennessee. As recently as the 1970s, this species had disappeared from both waterways due to the impacts of damming, poor water quality and over-fishing. Today’s release is the latest in the now-23-year-old effort to bring Lake Sturgeon back to the Tennessee River and Cumberland River.

A young lake sturgeon is viewed through a photographic aquarium after arriving at the Tennessee Aquarium Conservation Institute.  Tennessee Aquarium

Tennessee Aquarium welcomes 2,500 baby lake sturgeon as restoration effort turns 25 years old

Casey Phillips is a communications specialist at the Tennessee Aquarium in Chattanooga.

CHATTANOOGA — The approach of summer coincided with the arrival of thousands of juvenile lake sturgeon in the Tennessee Aquarium Conservation Institute. 

Biologists at the Aquarium’s freshwater field station welcomed 2,500, 2-inch babies into their care. After a steady diet of bloodworms and brine shrimp, bringing the fish to at least 6 inches, they will be reintroduced into the Tennessee River.

These tiny fish hold tremendous promise. Adult lake sturgeon may reach lengths of 8 feet and live 150 years. 

“They start out really small, so it’s shocking to think how big they can get,” says reintroduction biologist Sarah Kate Bailey. “The first year of life is when they grow the quickest. 

“They grow so fast while we have them here. You’ll go home for the day, come in the next morning, and they look like they’ve grown overnight.” 

Pollinator Pathway signs on the Tennessee Aquarium Plaza in Chattanooga lead guests on a self-guided tour highlighting native plants, pollinator behaviors, and unusual pollinators. Courtesy Tennessee Aquarium

TDOT joins with Tennessee Aquarium to pollinate our pathways

CHATTANOOGA — With their distinctive orange and black patterns, gossamer wings and harrowing 3,000-mile migrations, few insects are as charismatic or beloved as the monarch butterfly. 

Just imagine how tragic it would be if they disappeared.

So it was with alarm in 2022 that the world received news that the International Union for Conservation of Nature (IUCN) had declared the monarch an endangered species, citing population numbers that had fallen 80 percent since the 1980s. 

Similar anxiety met reports in the mid-2000s of colony collapse disorder. This sudden phenomenon dramatically imperiled the survival of European honey bees, whose activity directly or indirectly affects roughly one of every three bites of food we eat, according to the U.S. Department of Agriculture.

Pollinators are undoubtedly critically important to plants and humans alike, whether they’re investigating our Irises, calling on our Columbine, or buzzing our Blueberry bushes. This week, June 19-25, the world celebrates Pollinator Week, which recognizes the wondrous, vital contributions of butterflies, bees, moths, bats, and other pollinators.

A crimper is attached to the back of a tractor on a farm in the Sequatchie River Valley. A relatively recent agricultural technique, crimping has been shown to reduce farmers’ input costs and improve soil quality. Recently, USDA approved funneling $10 million into a six-county region of Southeast Tennessee. This money will fuel conservation-minded improvements for landowners, including lowering the cost to rent equipment like crimpers and subsidize the planting of cover crops to improve soil health and reduce sedimentation in nearby streams.  Tennessee Aquarium

Targeted collaborative conservation will help local agricultural operations improve soil and water quality and protect aquatic life

CHATTANOOGA — Tennessee is as much a patchwork quilt of farms as it is an intricately woven lacework of streams and rivers. Soon, farmers and the aquatic life living alongside them will reap the benefits of $10 million in federal funds to support water-friendly agricultural improvements in the rolling uplands of the state’s southeastern corner.

The U.S. Department of Agriculture (USDA) approved the allocation of more than $197 million to support Regional Conservation Partnership Programs (RCPP) throughout the nation. These initiatives promote coordination between USDA’s Natural Resources Conservation Service (NRCS) and partnering organizations that are already engaged in conservation efforts.

Jim Hill Fellow for Conservation Breelyn Bigbee holds a viewing window with a logperch in Long Swamp Creek while conducting fieldwork in search of bridled darters near Jasper, Georgia. Tennessee Aquarium

Tennessee Aquarium fellowships bring minorities into the science space

CHATTANOOGA — Never let it be said that all summer jobs are created equal.

Squatting on his heels to dangle the flexible hose of an environmental DNA pump into a briskly flowing North Georgia stream, the last few weeks have been anything but ordinary for Spencer Trimpe. With the pump’s droning motor steadily collecting a sample of water to filter out genetic traces of the stream’s inhabitants, he doesn’t bother holding back a smile.

A lanky junior biology major from Thomas More University, Trimpe is one of two students selected as part of the Tennessee Aquarium’s George Benz Aquatic Ecology Fellowship. Instead of manning a cash register or waiting tables this summer, he’s assisting freshwater scientists from the Tennessee Aquarium Conservation Institute with a variety of research projects.

Reintroduction Assistant Kaylee Clayton, left, Jim Hill Fellow for Conservation Anthony Hernandez, center, and Reintroduction Biologist Teresa Israel cross a stream during a Southern Appalachian brook trout release. Tennessee Aquarium

Emblematic brook trout get a second chance at home in Southern Appalachian streams

Casey Phillips is a writer for the Tennessee Aquarium.

CHATTANOOGA — A team from the Tennessee Aquarium, Tennessee Wildlife Resources Agency and Trout Unlimited hiked along — and occasionally waded through — a pristine tributary of South Fork Citico Creek in Cherokee National Forest. 

 Navigating an obstacle course of tangled mountain laurel branches and moss-slickened boulders in late May, the team followed the stream as it gently descended through the Appalachian uplands. When a calm pool or shaded rocky overhang presented itself, they paused to dip their nets into five-gallon buckets filled with wriggling juvenile Southern Appalachian brook trout.

These little fish, raised to about two inches over six months, were the focus of more than six months of work at the Tennessee Aquarium Conservation Institute and the impetus for the hours-long trek into the East Tennessee woods.