Data/hora: 06/06/2024 12:14:52

Provedor de dados: | 5
País: | France

Título:

Les besoins écophysiologiques des larves d'huitres creuse Crassostrea gigas en conditions contrôlees : effet de la température, de la nourriture et modélisation de la croissance

Ecophysiological needs for Pacific oyster larvae, Crassostrea gigas, under controlled conditions: influence of temperature and food and modelling larval growth

Autores: | Rico Villa, Benjamin.
Data: | 2009-06-24
Ano: | 2009
Palavras-chave: | Crassostrea gigas; Larve; Huître; Croissance; Ecophysiologie; Microalgues; Température; Système d’élevage; Modélisation; Crassostrea gigas; Larvae; Oyster; Growth; Ecophysiology; Microalgae; Temperature; Rearing System; Modelling.
Resumo: | Nowadays, spat production of Pacific oyster Crassostrea gigas relies on rearing techniques under controlled conditions in hatchery. In this context, an extensive research in aquaculture is necessary because larval development and metamorphosis are critical for hatchery management. Firstly, a diet consisted in a Haptophyceae: Isochrysis affinis galbana (clone T-ISO) and a Bacillariophyceae: Chaetoceros calcitrans forma pumilum demonstrated its efficiency to supply the nutritional needs throughout the whole larval rearing. Then, a flow-through rearing system was developed and coupled with a continuous hydrobiological data recorder to provide basic information for ecophysiology research through different trophic levels and/or temperature throughout larval development. Ingestion, growth and metamorphosis are found to be optimal at the highest temperatures (27 and 32 °C) and for a phytoplankton density (20 cells μl-1) around larvae. Finally, a bioenergetic model of growth was built under Dynamic Energy Budget (DEB) theory to understand the effect of the environmental conditions on the larval growth. This theory describes the rates at which a larvae assimilates energy from food and stores this energy as reserves for allocation to growth, development and maintenance. The DEB model allows to extend the growth description of oyster throughout larval rearing. It was proposed that high temperatures and a food density of 1000 μm3 μl-1 must be maintained around larvae throughout larval development to maximise growth. This first DEB model through the whole larval phase of a bivalve constitute a promising way to encompass the whole life cycle of C. gigas from larvae to adult.
Tipo: | Text
Idioma: | Francês
Identificador: | http://archimer.ifremer.fr/doc/00012/12308/9102.pdf
Editor: | Université de Bretagne Occidentale
Relação: | http://archimer.ifremer.fr/doc/00012/12308/
Formato: | application/pdf
Fonte: | The Author, Univesité de Brest