Data/hora: 01/06/2024 07:41:08

Provedor de dados: 	5	
País: 	France	
Título: 	La densite, un critere de qualite applicable en ecloserie aux embryos de Pecten maximus (mollusque bivalve)	
Autores: 	Faure, Catherine; Devauchelle, Nicole; Dorange, Germaine.	
Data: 	1992	
Ano: 	1992	
Palavras-chave: 	Pecten maximus; Bivalvia; Quality; Survival; Larvae; Growth; Sexual maturity; Spawning populations; Spawning; Embryos; Hatcheries.	
Resumo: 	The quality of the scallop embryos is determined by the spawners characteristics as well as by the external factors they support during the maturation and the spawning phases. All these parameters are not still well controlled during the artificial conditioning in the hatcheries. As a consequence, the quality of the embryos is drastically variable and with them, the larvae performances in terms of survival and growth rates. It would be interesting to get a simple and quick test which would allow the estimation of the spawns quality. The embryos density, evaluated by isopycnic centrifugation of Percoll medium, is well adapted to this objective. Actually, a centrifugation of embryos two hours after fertilization separates them in 3 stratum with their density ranging from 1,018 to 1,075. The medium stratum contains the best embryos. The relative thickness of this medium stratum is positively correlated with the larvae survival at day 2, 9 and 16, and with the larvae growth between day 2 and day 23. That is why the thickness of this medium stratum is a good indicator of the quality of the spawning.	
Tipo: 	Text	
Idioma: 	Francês	
Identificador: 	http://archimer.ifremer.fr/doc/1992/acte-915.pdf	
Editor: 	Actes de colloques. Ifremer Brest [ACTES COLLOQ. IFREMER.]. 1992	
Relação: 	http://archimer.ifremer.fr/doc/00000/915/	
Formato: 	application/pdf