A trout moves from a warm environment into a cold environment. Predict how the saturation status of hydrocarbon chains might change to ensure proper membrane fluidity in the new cold environment. A trout moves from a warm environment into a cold environment. Predict how the saturation status of hydrocarbon chains might change to ensure proper membrane fluidity in the new cold environment. The hydrocarbons would become more saturated to decrease the fluidity of the membrane. The hydrocarbons would become less saturated to increase the fluidity of the membrane. The hydrocarbons would become less saturated to reduce the fluidity of the membrane. The hydrocarbons would become more saturated to increase the fluidity of the membrane.