Shell length of the zebra mussel (Dreissena polymorpha) in three lakes of different trophic state

This dataset contains records of shell length of the invasive bivalve mollusc Dreissena polymorpha (zebra mussel) in three lakes of different trophic state. For more details see the original publication: Mastitsky SE (2012) Infection of Dreissena polymorpha (Bivalvia: Dreissenidae) with Conchophthirus acuminatus (Ciliophora: Conchophthiridae) in lakes of different trophy. BioInvasions Records 1, DOI: 10.3391/bir.2012.1 The following variables are included in the dataset: - Lake: the waterbody sampled - Month: sampling date - Site: sampling site within lake - ZMlength: shell length of the zebra mussels in a sample (to the nearest mm)