 Dr. Dwayne Fox did research for his Ph.D. in the Choctawhatchee and Pea Rivers by radio-tagging sturgeon in the Gulf of Mexico and tracking them up the Choctawhatchee and Pea Rivers upstream of Geneva.He even was able to collect samples of eggs to prove they were breeding in the Pea and Choctawhatchee rivers.Suckers are another fish that travel upstream as the weather changes.