Data/hora: 16/06/2024 06:28:50

Provedor de dados: 	5	
País: 	France	
Título: 	Estimation et amélioration des performances zootechniques de l'élevage larvaire de Dicentrarchus labrax et de Sparus auratus	
Autores: 	Chatain, Beatrice.	
Data: 	1994-07	
Ano: 	1994	
Palavras-chave: 	Sparus auratus; Dicentrarchus labrax; Larval breeding; Zootechnical performance; Sparus auratus; Dicentrarchus labrax; Elevage larvaire; Performance zootechnique.	
Resumo: 	By gathering specific measurement criteria and an objective analysis  of field methods, the main purpose of this work is to help estimate larval Sea Bass (Dicentrarchus labrax) and Sea Bream {Sparus auratus) stock performance raised under intensive conditions. As such, it is a  methodology guide zootechnicians can use, in their daily quantitative and  qualitative evaluation stock issues. The first part of this work covers defining the precision of current counting  methods and establishing their limitations. The quantification methods  analysed, as well as the new proposed methods, relate to the major phases of larval farming, from laying to postlarval stage. Three field methods commonly used in aquaculture to quantify egg population  are therefore studied. They are: taking laying samples, measuring their  global weight and total volume. The second part of this work provides precise morphological and behavioural clues partially filling the lack of or inaccurate definition of reference names necessary in evaluating raising quality. The notion of quality can be brought  on globally or individually, whether it describes stocks or one larva. Therefore, survival, growth, stock homogeneity, and its behaviour are population descriptors linked to a positive raising progression. Morphological criteria, for their part, describe fish intrinsic quality. Criteria taken into account here are those which are directly visible to the farmer in his hatchery. They are divided into three categories and relate to morpho-anatomy, ethology, and morphometry of both species. Lastly, our work ends with the study of two other criteria categories selected  as potential estimators of stock quality: ¿ Ethological criteria based on precise descriptions of what spatial  distribution, natatorial and trophical larva behaviour must be throughout  the different raising phases. They allow instant stock estimation or of its  immediate future. The knowledge of larvae's sensorial equipment evolution  allows, for its part, to better understand some of their behaviour and to direct  research towards some of the raising conditions harmful to larva development.. ¿ Morphometrical criteria, corresponding to length growth standards, weight growth,  dispersion and high populations' structure according to intensive techniques  standards. The performance and variability levels observed represent the current intensive larval zootechnology's "savoir faire" status for Sea Bass and Sea Bream.	
Tipo: 	Text	
Idioma: 	Francês	
Identificador: 	http://archimer.ifremer.fr/doc/1994/these-1750.pdf	
Editor: 	Aix-Marseille 2	
Relação: 	http://archimer.ifremer.fr/doc/00000/1750/	
Formato: 	application/pdf