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No Thumbnail AvailableProjectA 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
1985Also available in:
No results found.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. -
No Thumbnail AvailableProjectObservation on feeding habits of fish in ponds receiving green and animal manures in Wuxi, China
Establishment of a Network of Aquaculture Centres in Asia
1984Also available in:
No results found.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. -
Book (stand-alone)Small Ponds Make a Big Difference: Integrating Fish with Crop and Livestock Farming 2000SINCE THE 1970s, global aquaculture production has grown rapidly and is now among the fastest growing food production sectors in many countries. Although Asia is by far the leading region with about 90 percent of aquaculture production, the importance of aquaculture is growing in Latin America and Africa. However, in relation to the potential for its development in these regions, aquaculture production is still marginal. Introducing aquaculture ponds in farming systems can improve th e economic and ecological sustainability of resource-poor farms. Potential benefits from integrating aquaculture in smallholder farming systems include: . enhanced rural employment and income through additional or off-season production; . improved food security; . increased availability of high-value protein food; . decreased risk through diversification; . improved water availability and nutrient recycling; . environmental benefits through enhanced resource flows. Despite it s potential, aquaculture is an often neglected option in agricultural development. Planners and senior agricultural research and extension officers often lack the information to identify opportunities for aquaculture development and to evaluate its feasibility under specific conditions. Traditionally, aquaculture research and extension is handled by specialized institutions, operating independently from crop and livestock institutions. Successful introduction, however, requires polic y-makers and planners to take sufficient account of diverse and often location specific social, economic, cultural and environmental conditions in traditional farming systems. As a joint effort of aquaculture and farming systems specialists, this book is designed for policy-makers in agriculture with no or little prior exposure to aquaculture. Its main focus is on extensive to semi-intensive small-scale pond aquaculture in developing countries. The main objective is to create awareness about the prerequisites and potential contributions of aquaculture in various farming systems. The book provides many examples of success and lessons learnt, and points out key considerations that are crucial to achieving the successful integration of aquaculture and agriculture on smallholder farms around the world. It is hoped that this publication will not only increase awareness about the role of aquaculture in farming systems development but also stimulate further collaboration among aquaculture and farming systems specialists and institutions, leading to enhanced support to and development of efficient farming systems in developing countries.
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