Benthic Blitz Uncovers Rare Aquatic Species in Upper Cumberland Basin

TWRA biologists held their second annual Benthic Blitz, covering 123 sites from 10 watersheds within the Upper Cumberland River Basin. The watersheds included the Caney, Collins, and Calfkiller rivers. A benthic blitz is critical for maintaining wildlife diversity, aims to fill date gaps, and targets rare animals such as bottom-dwelling snails, mussels, crayfish, and fish. Healthy aquatic ecosystems should have a wide range of species.

Led by TWRA biologists Brittany Bajo-Walker and Parker Hildreth, nearly 100 biologists representing 28 unique partners participated in this year's blitz and represented state, federal, university, non-profit, and consulting organizations. The event allows biologists to explore new segments of river, discover new animals, and build new relationships with partnering agencies.

Benthic Blitz highlights included more than 74 benthic species and approximately 9,668 animals that were observed. Seven mussels, 15 crayfish, and 46 fish were identified. Biologists located 14 species of Greatest Conservation Need, and two listed as federally endangered. Littlewing Pearlymussel (Pegias fabula), are extremely rare and known to exist in only two river systems. A new, robust population of Littlewing Pearlymussel will provide amazing recovery opportunities for this species.

"Exploring an aquatic region with this level of effort allows us to fill in significant data gaps within the Biodiversity Division and leads to more informed conservation and management practices,” Brittany said. “These extremely rare and cryptic animals are so incredibly important to the overall health of an ecosystem, and we are so grateful that partners are willing to loan their time to this effort."

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