Jan 2021 DOI 10.14302/issn.2575-1212.jvhc-20-3467
Jairo Kavana NicholasCorresponding author
St. Francis University College of Health and Allied Sciences, P.O Box 175, Ifakara, Tanzania
Background In natural conditions Cyclops are the first intermediate hosts in the life cycle of Spirometra species. In this paper we describe simple method of culturing Copepod of the genus Cyclops for use the first intermediate host in experimental life cycle of Spirometra species. Methods Paramecium was first cultured to be used as food for Cyclops. Sample of water was collected from a pond within Sokoine University. About 100 ml of water and pre-boiled wheat grains were transferred in a Petri dish and kept under laboratory conditions for 7 days, a swarm of Paramecium was formed. An adult female egg sacked Cyclops from a natural water pond in Tarangire National Park, Tanzania was added in a new Petri dish containing tap water, 0.3 ml of Paramecium suspension and 4 pre-boiled wheat grains. The mixture was kept under laboratory conditions temperature 26-29⁰C and observed daily. Results Eggs from the single Cyclops hatched to nauplius. The average time of developing to nauplius I was 1.2 days, nauplius I to copepodite I was 6.9 days, and copepodite I to adult female Cyclops was 26.3 days. The average measurements of naupliusI were 120.2µm length and 80.0µm width while the adult female was 846.3µm length and 284.6µm width. The adult female produced 1 to 8 broods (mean 4.3). The life span of Cyclops averaged 43.1 days. Conclusion The Cyclops cultured in the laboratory were fed Paramecium and used as first intermediate host in the experimental life cycle of Tanzanian Spirometra species.
Feb 2019 DOI 10.14302/issn.2637-6075.jpae-19-2586
E H RadwanCorresponding author
Zoology department, Faculty of Science, Damanhour University, Egypt.
Melia azedarach extract were applied by feeding the adult female flies on diets mixed with the extracts at different doses. The concentrations of Melia azedarach utilized were 1.8, 2.4 and 3.6%. The gonotrophic cycles of length of 90, 753, 67.6 and 84, 72, 68 hours were obtained after feeding at age 24 hours with diet mixed with doses of 1.8, 2.4 and 3.6% fruit extract; respectively. 98 & 96 hours were the length of gonotrophic cycle in the control groups. The length of 86.7, 72.3, 57.3 and 89.3, 75, 61 hours were obtained after feeding adults at age 48 hours with diets mixed with different doses of fruit extract of the same plant 97.3 and 98.7 hours were the length of the control groups. Proportions of the egg hatching reached 69, 55.3, 49 and 72.9, 64.2, 52 in groups of eggs obtained from 24 hours adults feeding with diets mixed with doses of 1.8, 2.4 and 3.6% fruit extract; respectively. Also 68.7, 53.3,48 5 and 81 2, 70, 56.3 were the proportions of egg hatching obtained from groups at age 48 hours after feeding with diets mixed with the same doses. 85, 77.6, 62.2 and 92.6, 88.9, 84.9 were the proportions of the egg hatching obtained from groups feeding with diets mixed with doses of 1.8, 2.4 and 3.6% fruit extract of Melia azedarach; respectively. The pupae showed larval-pupal intermediates which failed to complete the pupal period and died after emerging from the third larval instar.