Each of the two Ecotoxicology Mobile Field Trailers have been designed to function as mobile laboratories to facilitate testing the exposure of multiple species to waste waters and contaminants within the watershed, including process streams from industries and municipalities, agriculture and other activities. The trailers are equipped specifically to test the responses of small-bodied native fish species, model teleosts (e.g., zebrafish), as well as primary producers (macrophytes, etc), invertebrates (larval insects, etc) and larval vertebrates (amphibians) to waste waters primarily along the Grand River. The mobile field facilities are 30′ x 10′ portable trailers equipped for fish/invertebrate flow-through or static exposure systems (aquaria, air/power/lighting, heat pumps, plumbing, reservoirs, glass dilutor equipment, etc.). They also include equipment for sample collection, analysis, and water quality assessment. The mobile field trailers are staged at Wilfrid Laurier University, allowing integration of field and lab studies (including fish holding). The staging facility houses watershed hydrometeorology calibration units, and supports sample storage and analysis.