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Evaluation of the nutritious potential of Macrofita aquatic Lemna minor, through it analyzes its of the chemical composition and for its use in ration for common carp (Cyprinus carpio L.) in the phase of it recreates

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Author(s): Álvaro Graeff et al.

Journal: Evidência : Ciência e Biotecnologia - Interdisciplinar
ISSN 1519-5287

Volume: 7;
Issue: 1;
Start page: 37;
Date: 2007;
Original page

Keywords: Chemical composition | Cyprinus carpio L. Feeding | Lemna minor.

ABSTRACT
Duckweed is widely used in treatment of effluent, acting in the reduction and removal of nutrients, toxics composites, heavy metals and patogenes organisms. Recently many works evidenced its use in animals feeding for having high taxes of protein in its biomass. This project analysed the chemical composition of Lemna minor and its efficiency when used in ratios for common carp (Cyprinus carpio L.) in substitution the soy. For the analysis of chemical composition, the dry biomass of L. minor presented 13,5% of inorganic substance and 86,5% of organic substance, 5,34% correspond the lipids, 6,3% the carbohydrates, 9,16% the starch, 3,62 UDO/g of dry weight of polyphenols and 45% the protein. It was chosen to elaborate rations for fish because its of fast growth, several types of treatment and better control from external factors. It had been formulated four types of treatments: treatment I with 0% of L. minor (control treatment), treatment II with 6%, treatment III with 12% e treatment IV with 18% of flour of L. minor in substitution of soy flour. Each treatment was supplied for 30 fingerlings (Cyprinus carpio, daily pay phase fattening) divided in 6 aquariums, during 120 days. The highest tax of survival was verified in treatment III, the treatment IV was what presented the greatest deformations in the fingerlings and the heaviest final weight was verified in the treatment II, therefore, it indicates a substitution of 6% of soy flour for L. minor flour for feeding of Cyprinus carpio L. in the recreats phase or its use as supplement in rations.
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