Aquat. Living Resour.
Volume 26, Number 3, July-September 2013
|Page(s)||263 - 271|
|Published online||05 August 2013|
Physiological responses of female and male black-lip pearl oysters (Pinctada margaritifera) to different temperatures and concentrations of food
IFREMER, UMR Environnement insulaire
océanien, BP 7004,
98719 Taravao, Tahiti,
a Corresponding author:
b Permanent address: Centro de Investigaciones Biológicas del Noroeste (CIBNOR), Unidad Sonora, Apdo.Postal 349, Guaymas, Sonora 85450, Mexico
Accepted: 6 June 2013
This study was designed to measure responses of four-year-old black-lip pearl oysters (Pinctada margaritifera) to different temperatures and food concentrations and to identify the energy requirements of each sex. Oysters were fed a monospecific microalgal diet of Isochrysis affinis galbana (T-iso). Measurements of oxygen consumption and ingestion rates were carried out at 24 °C and 27 °C and at two algal (T-iso) concentrations: 5000 and 30 000 cell ml-1. Glycogen content in adductor muscle, absorption efficiency and scope for growth were also estimated. Females and males responded differently to environmental factors, with food level being the most influential parameter. Oxygen consumption and absorption efficiency were significantly higher in females than in males, but males had significantly higher glycogen content than females. At high food concentration, glycogen content, ingestion rate, oxygen consumption, and scope for growth were significantly higher than at the low food concentration. Only absorption efficiency was significantly higher at the low food concentration. Oxygen consumption was significantly higher at 27 °C than at 24 °C. These results indicate that females and males have different bioenergetic functioning and that energy demands for reproduction are higher in females.
Key words: Food supply / Ingestion rate / Glycogen / Oxygen consumption / Scope for growth / Pearl oyster
© EDP Sciences, IFREMER, IRD 2013
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