Temperature is one of the most important factors shaping life and ecosystems. In this course we will study how temperature affects water (in all the phases) and life under different situations from optimal ranges to extremes. Once we have discussed how temperature interacts with salinity, pH, pressure, thermodynamics, metabolism and other factors… we will approach the use of low temperatures for conservation: cryopreservation. This course will explain the basic concepts of cryobiology and the latest findings and uses regarding aquatic organisms.