International Journal of Fauna and Biological Studies
2018, Vol. 5 Issue 4, Part A
Laboratory studies on developmental stages and life cycle of Daphnia magna
Ankita Thakur and DK Kocher
The freshwater cladoceran, Daphnia magna
is of great importance being used as a key model in ecological, developmental and ecotoxicological studies. D. magna
were collected from village ponds (Punjab), identified and then cultured under laboratory conditions. Biological characteristics like developmental period of juvenile instars or pre-adult instars, number of egg clutch/brood, body size of juveniles and adult were studied. Female D. magna
showed the capacity to carry clutch of 5-10 eggs in her brood chamber. Adult female was found to produce clutch of eggs every 3-5 day during her life span. Before achieving adult size they undergoes 5-6 moltings i.e. gradually increases in their size. The developmental period from 1st
juvenile instar till the emergence of adult varied from 6-8 days in case of females. Whereas it took 4-6 days to convert juvenile instar into adult in case of male Daphnia.
Females attain their sexual maturity within 6-10 days. Life cycle i.e. from egg to adult was completed within 9-11 days. Overall life span of single D. magna
was 30-45 days under ideal laboratory conditions.
Pages: 04-08 | 953 Views 37 Downloads
Ankita Thakur and DK Kocher. Laboratory studies on developmental stages and life cycle of Daphnia magna. Int. J. Fauna Biol. Stud. 2018;5(4):04-08.