Fig. 4. Glycerol levels in tissues of rainbow smelt Osmerus mordax subjected to a controlled decrease in water temperature. The date at which a controlled temperature decrease was initiated (i.e. 15 January 2004) was used as day 0. Water temperature (°C) on each sampling day is shown on bottom panel in parentheses. Values are means ± s.e.m., N=4 for all time points.