Knee-deep in a river of northern Thailand, scientists scooped up some sand with a net and sifted through it. Hidden between ...

Every year, on 3rd of April we celebrate World Aquatic animal Day. Among these, aquatic Insects are the most important.

Which means mayflies tell a larger story. "This mayfly hatch can be an indicator of how healthy those connections are in the terrestrial and the aquatic environment in Lake Erie," said Hintz.

Instead of looking for adult mayflies, researchers were searching for aquatic immature mayflies, known as nymphs, and used nets to scoop sand from the riverbed, the study said. The method worked.