Effect of temperature on haemodynamics and movements of thoracic appendages of fairy shrimp Streptocephalus dichotomous were quantified in a series of experiments. It has been observed with help of Joseph's Rotary Video Microscope (JRVM) that activity of thoracic appendages was related to temperature variations. For this experiment, a 500 ml storage water tank was connected to the mini culture chamber, provided with a valve meant for regulating the flow of water and placed on the stage of microscope. The appendages were functioning as respiratory structures and their movement is required for active respiration to maintain the metabolic rate. The movement of the blood in S. dichotomous is directly proportion to the contractions of heart which inturn is related to the temperature variations. The rate of heart contractions increases with high temperature and reduces in low temperature.