by Andrew Blok, Great Lakes Echo

Lennart Lennuk [CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0)]

Big changes for tiny creatures have swept through the Great Lakes in the past two decades, with ramifications for the salmon and trout people love to chase.

Major shifts in zooplankton levels—most notably crashes of populations in Lake Huron—are “shocking” in some cases, said Richard Barbiero, a contract researcher for the U.S. Environmental Protection Agency and the coauthor of a June study that presented the findings.

The zooplankton in Lakes Michigan and Huron shifted dramatically from 1997 to 2016, according to a the study recently published in the Journal of Great Lakes Research and funded by the EPA’s Great Lakes National Program Office.

Read more: