Abstract
Growth, survivorship of immature animals and breeding activity in Jesogarrmarus sp, were studied at 9°C, 14°C and 19°C in the laboratory. Growth rates increased with temperatures in isolated condition but decreased in group animals. Initial mortality was highest in 19°C and survivorship was low in group animals than in isolated animals. Breeding was least successful in 19°C in terms of the release of young per female breeding cycle as well as the number of young released per brood. It was concluded that the upper critical temperature for the population of Jesogammarus sp, lay at about 19°C.
