Imagine the river in Cuyahoga Valley back in the 1970s. Detergent bubbles clogged the bend in Peninsula. Catching a carp near Station Road was considered lucky. On bad days, a funk hung in the air from Akron’s water treatment plant. Fast forward to today when bald eagles, otters, and great blue herons are regularly seen raising their young. Kayakers paddle the Cuyahoga River Water Trail past the site of former dams in Brecksville. Could it get any better?
It just might. This year the national park and its partners began two projects that were unimaginable back in those early days. Both explore whether the river can now support some of Ohio’s rarest forms of aquatic life. The first is looking at freshwater mussels and the second at lake sturgeon.
It’s easy to mistake our native mussels for rocks. However, their unassuming looks bely their importance—they are actually rock STARS. According to the US Fish & Wildlife Service and The Nature Conservancy, North America has the greatest diversity of freshwater mussels in the world. The largest concentration is here in the Midwest. Unfortunately, mussels are also our most imperiled group of animals. The adults are sedentary filter feeders. Most cluster in communities called mussel beds that can support 30 or more species. Mussels can live for decades, and sometimes a century or more. This makes them vulnerable to long-term changes in our waterways.
Because of a quirk in their reproduction, freshwater mussels are also good indicators of how healthy certain fish populations are. Female mussels protect their fertilized eggs in a special gill pouch. When the time is right, she uses a specialized lure to attract a host fish and then squirts the unsuspecting babysitter with tiny larvae. The larvae hitchhike for a few weeks in the fish’s gills or fins and then drop off in a new territory. Mussels are out of luck if the right fish aren’t around, or the water is too polluted, or rapid flows wash away the riverbed where the larvae would attach.
In late July, a team of scientists led by the US Army Corps of Engineers collected a small number of fatmuckets (mussels have the coolest names) from the Grand River and relocated them to the Cuyahoga. The mussels are protected within tethered underwater cages. We’re watching to see how they fare. If you come across a cage, please don’t disturb it. Should this pilot be successful, the partners will move forward with a more extensive research project to guide a larger reintroduction program in the coming years.
A second team led by the US Fish & Wildlife Service is mapping the riverbed to see if the Cuyahoga has the right habitats to support lake sturgeon. They are looking at the entire lower half, from the Gorge Dam to the mouth in Cleveland. These unusual fish are uncommon in Lake Erie. The most striking thing about them is that they have rows of heavy, bony plates instead of scales. And they can live to be 150 years old and reach up to 300 pounds! Recent research has confirmed that lake sturgeon travelled up the Cuyahoga to spawn in the past. These fish need places with a pebbly bottom where females can lay their eggs, as well as sandier spots where young hatchlings can find food.
In early spring, US Fish & Wildlife Service staff floated downriver with a side scan sonar. This technology is being used to create a three-dimensional image of the Cuyahoga’s riverbed. Over the summer, they trained national park staff and volunteers on how to “ground truth” the sonar model. Basically, we’re helping with the field work to see if the sonar accurately identified underwater patches of sand, gravel, pebble, or bedrock. To do this, team members use an underwater viewer called a bathyscope—think orange safety cone meets snorkeling mask. If the Cuyahoga has what sturgeon need, we hope to start a reintroduction program. This would build on projects in the Maumee River near Toledo and in the Big Darby Creek near Columbus.
Whether you get excited about wildlife or not, consider what this means for our region. Greening the Rust Belt is a heavy lift. Each success shows our strength and commitment to a better future for all forms of life, including people.
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