EFFECTS OF PHYSICO-CHEMICAL PARAMETERS ON PRODUCTION OF Daphnia IN MASS CULTURE USING LOCALLY AVAILABLE ORGANIC MANURE IN RAIPUR DISTRICT OF CHHATTISGARH
Physico-chemical characteristics of water play an important role in regulating the growth and reproduction rate of Daphnia. Optimum levels of these parameters are essential for the better survival of Daphnia. Manures influence the quality of water to a large extent; Egg to egg generation time for cladocerans is 7-8 days at 200 C with a life span of approximately 50 days. The total young ones produced per adult in their life span is 400-600 for cladocerans compared to 250-300 for copepods at this temperature. Series of experiments was conducted under controlled conditions in the aquaculture laboratory, Department of Fisheries, Indira Gandhi Agricultural University, Raipur (Chhattisgarh) for stock culture of Daphnia sp. Treatments (T2 -T9) three different manure (viz. poultry droppings, Cow dung and goat dung) each having different concentration combination (viz. 25g, 50g and 75g) with GOC100g + SSP 50g in common for all, were prepared to observe the growth of Daphnia. T0 the control treatment was having only bore well water whereas T1 is having GOC 100g + SSP 50g. The duration of experiment was 90 days.
The mean value of dissolved oxygen content of water was significant among different eleven treatments (T0-T10). The highest mean was observed 3.16 mg/l for (T5) and lowest at 1.78 mg/l in (T10) is distinctly observed in the experiment. The fluctuation of free carbon dioxide in different treatments was due to the population variation of Daphnia, which was highest in treatment T4 where they consumed dissolved oxygen and released carbon dioxide into the water that increase the dissolved free carbon dioxide. Among the treatments highest mean of free carbon dioxide was found in T4 (1.59 mg/l) and lowest in T0 (1.23 mg/l).The temperature values of different treatments were not significant. The temperature ranged between 26.100C-26.330C in all the experimental tubs. The maximum population density of varied non-significantly with different dozes of animal waste. The highest mean population was observed at T3 (79 individual/ml). In the present study, the water parameters in different treatments remained more or less within the optimal limits except for some small fluctuations during the whole experimental period.
