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Influence of feeding regime and temperature on development and settlement of oyster Ostrea edulis (Linnaeus, 1758) larvae

Author:
Robert, René, Vignier, Julien, Petton, Bruno
Source:
Aquaculture research 2017 v.48 no.9 pp. 4756-4773
ISSN:
1355-557X
Subject:
Chaetoceros, Ostrea edulis, diet, energy, growth models, ingestion, larval development, microalgae, oyster larvae, phytoplankton, rearing, temperature
Abstract:
Under controlled conditions of food density and temperature, larval performances (ingestion, growth, survival and settlement success) of the flat oyster, Ostrea edulis, were investigated using a flow‐through rearing system. In the first experiment, oyster larvae were reared at five different phytoplankton densities (70, 500, 1500, 2500 and 3500 μm³ μL⁻¹: ≈1, 8, 25, 42 and 58 cells μL⁻¹ equivalent TCg), and in the second, larvae were grown at four different temperatures (15, 20, 25 and 30°C). Overall, larvae survived a wide range of food density and temperature, with high survival recorded at the end of the experiments. Microalgae concentration and temperature both impacted significantly larval development and settlement success. A mixed diet of Chaetoceros neogracile and Tisochrysis lutea (1:1 cell volume) maintained throughout the whole larval life at a concentration of 1500 μm³ μL⁻¹ allowed the best larval development of O. edulis at 25°C with high survival (98%), good growth (16 μm day⁻¹) and high settlement success (68%). In addition, optimum larval development (survival ≥97%; growth ≥17 μm day⁻¹) and settlement (≥78%) were achieved at 25 and 30°C, at microalgae concentrations of 1500 μm³ μL⁻¹. In contrast, temperature of 20°C led to lower development (≤10 μm day⁻¹) and weaker settlement (≤27%), whereas at 15°C, no settlement occurred. The design experiments allowed the estimation of the maximum surface‐area‐specific ingestion rate {J˙Xm} = 120 ± 4 μm³ day⁻¹ μm⁻², the half saturation coefficient {XK} = 537 ± 142 μm³ μL⁻¹ and the Arrhenius temperature TA = 8355 K. This contribution put a tangible basis for a future O. edulis Dynamic Energy Budget (DEB) larval growth model.
Agid:
5776241