Data/hora: 07/06/2024 09:07:21

Provedor de dados: 	5	
País: 	France	
Título: 	Intensive rearing of juvenile oysters Crassostrea gigas in an upwelling system : optimization of biological production	
Autores: 	Bacher, Cedric; Baud, Jean-pierre.	
Data: 	1992	
Ano: 	1992	
Palavras-chave: 	Nursery; Growth; Correspondence analysis; Multidimensional contingency table analysis; Economic efficiency; Skeletonema costatum; Crassotrea gigas; Nourriture; Croissance; Analyse des correspondances; Table de contingence multidimensionnelle; Rentabilité économique; Skeletonema costatum; Crassostrea gigas.	
Resumo: 	Seasonal growth of juvenile oysters (Crassostrea gigas) kept in an intensive upwelling system was studied from 1984 to 1986 in 60 to 90-day growth experiments. Saline ground water was used to produce Skeletonema costatum which was injected as food into the water supplying the upwelling system. Oyster density, water flow, phytoplankton concentration, temperature and frequency of food addition were controlled. Oyster growth was analysed with multidimensional contingency tables and correspondence analysis. The factors, in order of decreasing influence on growth, were temperature, food concentration and oyster density. A rearing strategy was deduced from the growth analysis for summer and winter. In summer, the density of  120,000 oysters/m2, the flow rate of 1 liter/d/oyster and the food concentration of 0.5 10(9) phytoplankton cells/litre gave the most interesting results. The oysters grew from 0.014 g to 2.2 g after 60 days. In winter, the heat exchanger was necessary to increase the temperature from the 5°C naturally observed to the 11°C required for valuable growth. Oyster density and food concentration were the same as in summer. For a flow rate equal to 3 liter/day/oyster, oysters grew from 0.01 g to 0.5 g within 100 days. The cos1 and profit computations were derived from these strategies. It was concluded that this type of nursery would be profitable in spring, summer, and autumn but not in winter due to the high cost of heating the water	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/1992/publication-3061.pdf	
Editor: 	EDP Sciences	
Relação: 	http://archimer.ifremer.fr/doc/00000/3061/	
Formato: 	application/pdf	
Fonte: 	Aquatic Living Resources (EDP Sciences), 1992 , Vol. 5 , N. 2 , P. 89-98	
Fonte: 	EDP Sciences