Crayfish, crawdads, mudbugs, ditchbugs, mountain lobsters, or good eats. No matter what you call it, crayfish are an important bellwether species that Jeff Simmons — a TVA aquatic biologist — studies to measure aquatic health. “Most people think a crayfish is just a crayfish, but in Tennessee alone, we have 96 described species of crayfish,” […]

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