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A REVIEW OF DIET FORMULATION STRATEGIES AND FEEDING SYSTEMS TO REDUCE EXCRETORY AND FEED WASTES IN AQUACULTURE

AUTHOR/S: G. L. MIHALCA, O. TITA, M. TITA, A. MIHALCA
Sunday 1 August 2010 by Libadmin2010

10th International Multidisciplinary Scientific GeoConference - SGEM2010, www.sgem.org, SGEM2010 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 20-26, 2010, Vol. 2, 369-378 pp

ABSTRACT

Significant efforts should be devoted to reducing waste outputs from aquaculture
operations in order to lower the environmental impacts of aquaculture in many parts of
the world. Since most aquaculture wastes are ultimately from dietary origin, reduction
of waste outputs should first be through improvements of diet formulation and feeding
strategies.
The first step in the production of feeds producing less solid waste is to eliminate poorly
digestible ingredients (such as whole grain or grain byproducts used as binders and
fillers in the feed formulae) and to use highly digestible ingredients with good binding
properties. Further reduction of solid waste can then be achieved through careful
selection of the ingredients to improve apparent digestibility and the nutrient balance of
the feed.
Nitrogen waste outputs can be reduced through the reduction of the digestible protein to
digestible energy (DP/DE) ratio of the diet. Phosphorus waste outputs can be reduced
through careful selection of the ingredients and optimization of the digestible
phosphorus content of the diet to meet the requirement of the fish but avoid greatly
exceeding this required level. Finally, feeding practices that minimize feed wastage
should be adopted since feed wastage can have a very significant impact on waste
outputs from fish culture operations.

Keywords: aquaculture, waste, feed, feeding