Larval growth and settlement of the European oyster (Ostrea edulis) as a function of food quality measured as fatty acid composition |
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Authors: | P R Jonsson K M Berntsson C André S-Å Wängberg |
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Institution: | Tj?rn? Marine Biological Laboratory, G?teborg University, SE-452 96 Str?mstad, Sweden, SE Department of Plant Physiology, G?teborg University, Box 461, SE-405 30 G?teborg, Sweden, SE
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Abstract: | Larval growth rate and settlement of the European flat oyster Ostrea edulis were experimentally studied as a function of the composition of dietary fatty acids. Diets differing in fatty acid composition
were composed by mixtures of the microalgae Isochrysis galbana, Pavlova lutheri and Chaetoceros calcitrans. Fatty acid content in the tissue of the feeding larvae, analyzed by gas chromatography and mass spectrometry, reflected
the composition in the diet. Larval growth rate was significantly correlated to the three omega-3 polyunsaturated fatty acids
(PUFA) C18:3, C18:4 and C22:6, with minor differences for neutral and polar lipids. No relation between growth rate and the
omega-3 PUFA C20:5 was detected, a PUFA often implied as essential for bivalves. It is suggested that naturally occurring
variability in fatty acid composition may constrain larval growth. In settlement experiments in both still water and flume
flow little substrate selectivity was found for some contrasting substrates. It is concluded that differences in dietary fatty
acids may explain as much of settlement success as the variability of substrates.
Received: 12 October 1998 / Accepted: 6 April 1999 |
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