Biologist Dr. John Waldman discusses why sea-river fish have dwindled in numbers, what we stand to lose, and actions needed to ensure their recovery. Discover the past, present, and future of these fascinating fish through research, historical accounts, anecdotes, and images.
Have you ever wondered what happens when a fish encounters a dam or a culvert? Too often, these structures are barriers to breeding and nursery sites, feeding grounds, and vital genetic mixing. In a warming world, barriers also prevent fish from seeking refuge as stream temperatures change.
A public-private partnership is hoping to make travel a bit easier for Hudson Valley fish by figuring out all the places where fish can't get there from here, and then fixing as many of them as possible.
Managing fish in human-altered rivers is a challenge because their food webs are sensitive to environmental disturbance. So reports a new study in the journal Ecological Monographs, based on an exhaustive three-year analysis of the Colorado River in Glen and Grand Canyons.