Historical biomass of Limnocalanus in Lake Michigan

► Recent biomass reports for Limnocalanus macrurus Sars in Lake Michigan are underestimates by as much as 4-fold. ► We created a length-weight model specifically for Limnocalanus in Lake Michigan. ► Our biomass estimates are approximately 3.5 times greater than previously reported. ► This has important consequences for trophic interactions, bioenergetic considerations, and relative dominance with respect to Cladocera and Diaptomidae in Lake Michigan.