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Charlyn Partridge, right, associate professor at GVSU’s Annis Water Resources Institute, examines a hemlock tree with biology major Zoe Gondeck at a Muskegon Conservation District site in Oceana County on July 23. Partridge is leading a study using e...

Vessel Scientific Equipment

Visiting students measure water quality in the D.J. Angus's research laboratory.
An AWRI instructor demonstrates the use of a plankton tow net.
An AWRI deckhand and visiting student collect water using a Van Dorn sampler onboard the D.J. Angus research vessel.
Jamie Cross displays a Florel-Ule scale, a series of colored water in vials that provides a measurement of water clarity not requiring expensive machines..
Page last modified June 8, 2026