Data/hora: 15/06/2024 14:30:11

Provedor de dados: 	5	
País: 	France	
Título: 	Influence de l'environnement trophique de l'élevage en biofloc sur les performances physiologiques de la crevette Litopenaeus stylirostris : Étude de paramètres de la nutrition, de l'immunité et de la reproduction	
Autores: 	Cardona, Emilie.	
Data: 	2015-03-04	
Ano: 	2015	
Palavras-chave: 	Biofloc; Crevette; Nutrition; Stress oxydant; Défenses antioxydantes; Immunité; Reproduction; Oeufs; Larves; Bactéries; Microbiote; Biofloc; Shrimp; Nutrition; Oxidative stress; Antioxidant defences; Immunity; Reproduction; Eggs; Larvae; Bacteria; Microbiota.	
Resumo: 	Biofloc is an intensive rearing system with zero or minimal water exchange where a diverse population of microorganisms (microalgae, zooplankton and bacteria) develops in association with organic matter to form the floc particles. These particles play the double role of biological filter and dietary supplement. This dissertation aims to better understand the process of this rearing system and its interactions with the Litopenaeus stylirostris shrimp. Two specific objectives were integrated within the framework of this general objective: (i) to measure the production gain from biofloc rearing and (ii) to study the interaction between biofloc environment and shrimp and to assess its role on production performances of shrimps. Thus, our results show production gains of shrimp reared in biofloc in terms of survival, growth, reproductive performances and quality of larvae. This better performance can be explained by the contribution of natural productivity, estimated between 37 and 40%, in shrimp food. This food supplement, constantly available in the environment, provides energy, nutrients and bioactive molecules. The natural productivity represents a source of lipids, in particular of phospholipids and polyunsaturated fatty acids, which were essential for the reproduction and development of larvae during the lecitotrophic stage; these lipids were accumulated in digestive gland and eggs from females reared in biofloc. The natural food is also a glutathione source, a powerful antioxidant molecule, which contributes to strengthen antioxidant defense system of shrimps and protects lipids against peroxidation, a cause of oxidative stress. Bacteria were dominant in natural productivity of biofloc environment and contribute to shrimp food. Thus, in the last part of this dissertation, we characterized the taxonomic diversity and abundance of bacteria in biofloc environment and showed their influence on shrimp intestinal microbiota. Generally, we observed a better health of biofloc resulting in up‐regulation of the studied genes involved in immunity and antiradical defenses after oxidative stress with hydrogen peroxide. The positive effects of biofloc rearing on survival, growth and reproduction originate from food complement provided by natural productivity.	
Tipo: 	Text	
Idioma: 	Francês	
Identificador: 	http://archimer.ifremer.fr/doc/00272/38294/36492.pdf

http://archimer.ifremer.fr/doc/00272/38294/	
Editor: 	Université de Nouvelle-Calédonie	
Formato: 	application/pdf	
Fonte: 	2015 Université de Nouvelle-Calédonie

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