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EPA’s Research Vessel Lake Guardian Begins Summer Survey of Great Lakes

During the survey, scientists on the R/V Lake Guardian will collect samples of water and aquatic organisms such as plankton, zooplankton, and benthic invertebrates to assess water quality in the Great Lakes.

August 1, 2025

EPA’s 2025 Lake Michigan Benthic Survey Underway

Scientist aboard EPA’s largest research vessel, the R/V Lake Guardian, are collecting benthic samples in Lake Michigan to monitor the abundance and spread of invasive quagga mussels.

July 18, 2025

New study on Mysis population trends across the Great Lakes from 1997 – 2019

Scientists recently published a new summary of long-term trends in Mysis populations across the Great Lakes. Mysis diluviana, a small crustacean also known as the opposum shrimp, is an important component of the offshore Great Lakes food web.

October 11, 2023