This study evaluates the thermal tolerance of the veliger life stage of D. rostriformis in conditions similar to those it would encounter on a boat traveling between bodies of water. It hypothesized that veligers contained in interstitial spaces on recreational boats would encounter darkness, limited oxygen availability, and entrainment in a small volume of water. the authors chose to test veligers at temperatures near the presumed high and low limits of their tolerance, in an attempt to verify these assumptions. they hypothesized that quagga mussel veliger survival would be negatively influenced by both increasing water temperature and increasing time spent in the static water baths.