Feeding the pearl oyster Pinctada margaritifera during reproductive conditioning

Type Article
Date 2013-02
Language English
Author(s) Le Moullac GillesORCID1, Soyez Claude1, Sham-Koua Manaarii1, Levy Peva1, Moriceau Jacques1, Vonau Vincent1, Maihota Mayalen1, Cochard Jean-Claude2
Affiliation(s) 1 : IFREMER, Ctr Pacifique, Lab Ecosyst Perlicole, Taravao 98719, Fr Polynesia.
2 : IFREMER, Ctr Brest, Dept Environm Littoral & Ressources aquacoles, F-29280 Plouzane, France.
Source Aquaculture Research (1355-557X) (Wiley-blackwell), 2013-02 , Vol. 44 , N. 3 , P. 404-411
DOI 10.1111/j.1365-2109.2011.03045.x
WOS© Times Cited 14
Keyword(s) Pinctada margaritifera, food level, ingestion rate, reproduction, gametogenesis
Abstract This study aimed to model the food intake of P. margaritifera in order to examine the relationship between food level and reproductive activity. The effect of microalgae concentration on ingestion rate and assimilation efficiency was studied over a broad concentration range, using a mixture of Isochrysis galbana and Chaetoceros gracilis. Reproductive effort was assessed using three microalgae concentrations of 0.5, 7 and 18 cell μL-1. Reproductive status was assessed by gonad development index (GDI) – the ratio of the gonad surface to the visceral mass surface – and histological analysis of the gonad based on the presence (continuous or discontinuous) or the absence of gonial cells (GC). Ingestion is a saturating function of seston concentration for bivalves modeled with an adapted Michaelis- Menten function. The maximum ingestion rate of P. margaritifera adults was 193.50 106 cell.h-1.g-1 dw and the half saturation coefficient was 15 cell.μL-1. The concentration of 18 cell μL-1, supplied for 45 days induced a significantly higher GDI than the other treatments. GC decreased significantly and even stopped when pearl oysters were under-fed, suggesting that the mitotic process of the germinal stem cells was altered. Differentiation of germinal stem cells, therefore, appears to be controlled by food availability.
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