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A preliminary study on the nutrient sources for fish growth in manured pond as indicated by delta C analysis

Establishment of a Network of Aquaculture Centres in Asia

Year of publication 1985

Pages p. 13

Author Guo Xian-zheng, Fang Yingxue, Wang Jikun, Fang Xiuzhen and Liu Zhiyun;Fisheries and Aquaculture Management Division

Product type Project

Edition 1

Synopsis (short abstract) In a manured fish pond, the conversion of manure-feeds-fish undergoes a complicated process of pond dynamics. In order to understand and manipulate this process and to help us improve farming productivity, we introduced carbon isotope analysis in our experiment. We measured delta C of organic matter, such as fish body, fish feeds, manure, etc. And with this information, we traced the flow of carbon, analysing the interactions of fish growth and the complicated food web in a manured pond. The dat a show that filtering and omnivorous species in this manured pond obtained carbon from both autotrophic and heterotrophic production systems. This is of practical significance in planning aquacultural activities and seeking the truth of pond dynamics.

Language English

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    The use of organic manure in aquaculture is one of the main inputs in the Chinese system of integrated fish farming. Although many scientists in China and elsewhere have done much work on the effects of animal manure on aquaculture production (Chen Qiyu et al, 1982, Buck, 1978. 1979; Schroeder 1978, 1980; McGeacin et al, 1982; Stickney, 1977; Jhingran et al, 1980; Edwards, 1980; Zweig, 1981), little is known of the series of physical, chemical and biological processes which are taking place in a pond after application of manure. The complexity of energy recycling needs further studies. The aim of this study is to determine the independent contribution of three animal manures to changes in the ecological condition of pond water and fish production. The results to be obtained may provide the scientific basis for further research on the use of organic manure in fish culture.
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    Fish yields and ratios of naturally occurring stable carbon isotopes, 13C: 12C (reported as ä C) from 1 mu (670 m2) and 5 mu (3330 m2) ponds were measured. The ponds received daily inputs of green and animal manures as the sole organic inputs. Fish yields exceeding 40 kg/ha per day were attained in both the small and large ponds. ä C data indicated a strong contribution of the fresh fluid pig manure to growth of the two filter-feeding species, silver and bighead carp. Two grass-eating species, g rass carp and Wuchang fish (Megalobrama amblyscephola), had significantly different ä C values, indicating partially separate food sources for each of these two species.
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