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Utilisation of livestock wastes in the production of live food organisms - an aspect of enviromental management by A. Elango

By: Elango | [Researcher]Material type: TextTextPublication details: Thoothukudi ; Fisheries College and Research Institute ; 1994 Edition: M. F. ScDescription: 68pSubject(s): Live feed - AquacultureDDC classification: 639.8
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Reference Fisheries College and Research Institute, Thoothukudi
639.8 ELA (Browse shelf(Opens below)) Not for loan T64

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"Three different animal wastes cowdung, pigdung and poultry manures were used for the production of the cladoceran Ceriodaphnia sp. and the midge fly larvae chironomid. The various nutrients NO2- -N, NO3- -N and PO4 -3 -P released from the animal wastes were used for the growth of the primary algal food source and the subsequent production of the target livefood organisms. Simultaneous studies were also made on the various hydrobiological parameters viz. dissolved oxygen, CO2 Total alkalinity, COD, BOD, H2S, pH and temperature which were suppose to be the supporting abiotic factors in the production of the above mentioned livefood organisms. Ceriodaphnia sp. utilized a substantial quantity of nitrate- nitrogen (1.85 � 0.94 �g a t NO3 -N/l) and phosphate - Phosphorus (1.76 � 0.19 �g a t PO4 -P/l) nutrients from cowdung waste media inoculated with algae indicating the combined utility of the nutrient by the prolifying algae as well as Ceriodaphnia sp. Raw cowdung suspended medium indicated an enhanced Ceriodaphnia sp. production rate of 8667 to 12,233 nos at 5g/l and 2g/l concentration respectively. Cowdung waste media inoculated with algae showed 9900 to 13,200 Ceriodaphnia sp. per litre within a culture period of eight days. In raw and algae inoculated pigdung an optimum production range of 9,667 to 13, 433 and 9, 333 to 14, 233 nos/l was achieved respectively. An extremely high production of Ceriodaphnia sp. was achieved in pigdung inoculated with algae. In poultry manure inoculated with algae the Ceriodaphnia sp. production rate was varying between 8, 667 and 13, 767 nos/l. The final production number of chironomid larvae was found to be between 1, 079 to 1, 273 nos in raw cowdung and 1, 374 and 1, 641 nos in algae inoculated media. 1, 827 to 1, 936 nos of chironomid larvae were harvested from pigdung suspended with substratum in a period of seventeen days. A maximum of 21/l chironomid larvae were produced from 2g/l concentration of poultry waste kept with rack substratum. Animal waste with or without algal inoculm and with substratum revealed significant difference in their concentration, various treatments and the related chironomid production. The present investigation of utilizing animal wastes, as nutrient source is indeed an aspect of effective environmental management besides the production of livefoods."

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