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Preliminary studies on the effects of fresh and fermented pig manure on fish production

Network of Aquaculture Centres in Asia

Year of publication 1988

Pages p. 9

Author Yang Yejin, Zhu Yun, Hua Dan and Wan Junhua;Fisheries and Aquaculture Management Division

Product type Project

Edition 1

Synopsis (short abstract) The growth of several cultivated fishes of Cyprinidae was studied using cognate fresh and fermented pig manure and the equivalent fertilizers N and P as sole inputs to different experimental groups of fish ponds. Experiment I was conducted from June to October 1986, experiment II from March to October 1987. The proportions of fish production from chemical-fertilized ponds (C), fermented pig manured ponds (F1), and fresh pig manured ponds (F2) were 100:156:226 and 100:294:382 respectively. The ratio of fish production of F1 ponds to F2 ponds was 100 to 145 in experiment I and 100 to 130 in experiment II, respectively.The chlorophyl content, zooplankton biomass, bacterial activity and BOD were lower in the C ponds than in the F1 and F2 ponds, while the DO concentration was higher. There was little difference in the concentration of NH4-N and PO4-P among the experimental ponds. The physico-chemical parameters in the F1 and F2 ponds were not always in conformity with the fish production. Some parameters were contradictory in these two experiments. In the experiment I, the content of NH4-N in the F1 ponds was lower than that in the F2 ponds, and the content of chlorophyl and the biomass of zooplankton in the F1 ponds were greater than those in the F2 ponds. In contrast, in experiment II all these three parameters were reversed in the F1 and F2 ponds. These results indicate that part of the fish production in the C ponds came from the natural planktonic food chain, while in the F1 and F2 ponds, much of the production was derived from the manure detritus as well as from the planktonic food chain. The nutrient value of fermented pig manure is probably less than that of fresh manure because of bacterial decomposition during fermentation. There is a complicated relationship among various physico-chemical factors after manure application in the F1 and F2 ponds.

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    Project
    Comparative study on the effects of fresh and fermented pig manure on fish yield
    Establishment of a Network of Aquaculture Centres in Asia
    1986
    Also available in:
    No results found.
    1) Pig excreta after biogas fermentation are used as a manure source in fish ponds. Not only partial energy can be obtained, but also the decomposition of pig excreta can be conducted fully in anaerabic conditions, and the quick effective nutritional constituents would be raised and preserved. As a result, the biological resources can be reasonably utilized. 2) After applying fermented manure in fish ponds, the content of effective nutritional constituents augmented, resulting in the prolifera tion and growth of plankton and the improvement of the composition of phytoplankton. Fermented manure decreased the D.O. consumption during the process of decomposition of organic matter, and thus, it improved the ecological environment for various species of fish; it raised the food utilization rate with the result that fish yield could be increased. 3) Based on the comparative study for 2 years, the fish yield by using fermented manure was 7.1–25.6% higher than that by using fresh pig manure . The increment of feed-eaters is greater than the increment of plankton-feeders. At the same time, the quality of fish has been improved. It's worth extending the techniques owing to apparent economic benefit. 4) The synchroneous development of livestock-poultry culture, biogas utilization and fresh water aquaculture should be positively encouraged. It could lead to multi-storied comprehensive utilization of biological resources so as to raise the value of biological resources.
  • No Thumbnail Available
    Project
    Studies on the effects of fresh and fermented manure on fish production
    Establishment of a Network of Aquaculture Centres in Asia
    1987
    Also available in:
    No results found.
    With chemical fertilizer (N,P) as control, comparative studies were made on the effects of fresh and fermented pig manure on fish production. The results indicated that fish production in ponds supplied with fresh pig manure was the highest, compared to those with fermented pig manure, or control ponds. It appeared that fish in fresh pig-manured ponds not only could utilize bacteria, detritus and plankton, but could also directly feed on pig manure; thus pig manure was utilized better and result ed in higher fish production.
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