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| Ben Kheder, Rym; Quere, Claudie; Moal, Jeanne; Robert, Rene. |
| In the natural environment bivalve larvae are exposed to variable conditions and can therefore face periods of food shortage. To understand the resistance of early life stages of Pacific oyster (Crassostrea gigas), larvae were experimentally starved for 4 days at different periods of their development, and the resulting variations in their lipid reserves then analysed using image analysis and biochemical techniques. Faced with a temporary lack of food, the larvae halted their growth in size and weight and started to live off their lipid reserves; this effect was highly marked when the period of food deprivation was at the beginning of larval rearing, but was less marked when food deprivation was after day 14. The larvae conserved their developmental... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Larvae; Growth; Metamorphosis; Starvation; Lipids. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00018/12906/10145.pdf |
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| Ben Kheder, Rym. |
| Dans le présent travail, nous nous proposons d’étudier cet indice par coloration spécifique des lipides et de traiter les résultats par analyse d’images. Nous tenterons de quantifier les lipides de réserve apparaissant sous forme de gouttelettes colorées dans les larves et de préciser leur évolution au cours du développement larvaire. Un indice lipidique global sera alors déterminé comme étant le rapport de la surface de l’image occupée par les lipides à la surface totale de la larve. Une relation sera recherchée entre cet indice et la totalité ou une partie des descripteurs du développement larvaire. D’autre part, et afin d’estimer la qualité des larves, le développement larvaire de Placopecten magellanicus a été étudié en relation avec l’évolution du... |
| Tipo: Text |
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| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/00033/14450/11750.pdf |
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| Ben Kheder, Rym; Moal, Jeanne; Robert, Rene. |
| 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 (>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 >= 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... |
| Tipo: Text |
Palavras-chave: Crassostrea gigas; Larvae; Growth; Metamorphosis; Temperature; Lipids; Physiological indices. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00019/13046/10146.pdf |
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