Hypsibius dujardini. Water Bear culture - Easily maintained water bear which feeds on unicellular algae i.e. JA68 Chlorococcum sp. Life cycle from eggs to adults is usually about 3-4 weeks at room temp. (14-22 Celsius) and viable eggs are laid in moulted cuticles. Standard 50ml cultures contain approx. 100 tardigrades plus eggs and sufficient algal food to sustain them for up to 2/3 weeks.