Data/hora: 07/06/2024 09:39:45

Provedor de dados: 	5	
País: 	France	
Título: 	Impact of temperature on larval development and evolution of physiological indices in Crassostrea gigas	
Autores: 	Ben Kheder, Rym; Moal, Jeanne; Robert, Rene.	
Data: 	2010-11	
Ano: 	2010	
Palavras-chave: 	Crassostrea gigas; Larvae; Growth; Metamorphosis; Temperature; Lipids; Physiological indices.	
Resumo: 	The effect of four temperatures, ranging between 17 degrees C and 32 degrees C, was studied on development and lipid reserve management of Crassostrea gigas larvae. No effect of temperature was found on larval mortality, as high survival (&gt;90%) was recorded before competence at all temperatures studied. Temperature did, nonetheless, have a strong effect on growth and settlement success. At low temperature (17 degrees C), larvae competent to metamorphose were only observed from day 23 and only a low percentage finally achieved metamorphosis (12%). The opposite was seen at temperatures &gt;= 27 degrees C: larval competence appeared at day 18 and led to high rates of metamorphosis (60-90%). This difference at settlement seemed to be linked to larval growth, which showed rates of 7 mu m d(-1) at 17 degrees C vs. 10.5 mu m d(-1) at 32 degrees C. In addition, a higher accumulation of lipid reserves at low temperature was revealed by both biochemical (TAG/ST) and colorimetric (OLI) methods. In fact, the lower the temperature, the higher the mean TAG/ST levels recorded (6-9 at 17 degrees C vs. 2-4 at 32 degrees C). In the same way, larvae reared at 17 degrees C had a percentage lipid surface coverage between 19 and 29% (at sizes between 80 and 230 mu m), while lipids covered only 5 to 16% of the surface of larvae reared at 32 degrees C (at size &lt;250 mu m). Neither of these physiological indices can, however, provide a relevant indication of the larval performance induced by different rearing temperatures. (C) 2010 Elsevier B.V. All rights reserved.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/00019/13046/10146.pdf

DOI:10.1016/j.aquaculture.2010.09.005	
Editor: 	Elsevier Science Bv	
Relação: 	http://archimer.ifremer.fr/doc/00019/13046/	
Formato: 	application/pdf	
Fonte: 	Aquaculture (0044-8486) (Elsevier Science Bv), 2010-11 , Vol. 309 , N. 1-4 , P. 286-289	
Fonte: 	2010 Elsevier B.V. All rights reserved.