Abstract
Laboratory experiments to determine the stage durations of Pseudocalanus elongatus (Boeck) and Calanus sp. have been described. The duration of all the nauplius and copepodid stages at temperatures ranging from 4° to 15 CC is given for both species. The effect of temperature on the development rate of copepod eggs has also been determined at these temperatures. The effects of food supply and temperature on the distribution, abundance and development rate of different species of copepods are discussed.