Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 343729
Title Exploring the trophic structure in organically fertilized and feed-driven tilapia culture environments using multivariate analyses
Author(s) Muendo, P.N.; Milstein, A.; Dam, A.; Gamal, N.E.; Stoorvogel, J.J.; Verdegem, M.C.J.
Source Aquaculture Research 37 (2006)2. - ISSN 1355-557X - p. 151 - 163.
Department(s) Aquaculture and Fisheries
Land Dynamics
Publication type Refereed Article in a scientific journal
Publication year 2006
Keyword(s) oreochromis-niloticus - chemical fertilizers - aquaculture ponds - fish ponds - water - nitrogen - polyculture - phosphorus - manures - budgets
Abstract Reports of similar yields in manure and feed-driven tilapia culture environments raise questions on food utilization in these environments. The possibility that similar production rates are because of utilization of different foods was investigated using exploratory techniques of multivariate analyses. Using factor analysis, trophic pathways through which food becomes available to fish were explored, and using anova models, water quality, sediment quality and tilapia growth and yields were compared. Conceptual graphic models of the main ecological processes occurring in feed-driven and organically fertilized environments are presented and discussed. In both environments, autotrophic and heterotrophic pathways are important processes that result in the availability of natural foods that are utilized by the fish. Extrapolated fish yield data indicate that with equal nutrient input and stocking density, organically fertilized environments could achieve production rates similar to those in feed-driven environments. The general assumption that supplemental or complete foods are well utilized by tilapia in outdoor stagnant ponds remains challenged, and further research on tilapia feeding behaviour and food selection in feed-and organic fertilizer-driven environments is needed.
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