The effect of seawater flow and temperature on metamorphosis and postlarval development in great scallop |
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| Authors: | René Robert Laurence Nicholas |
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| Institution: | (1) Station Expérimentale d'Argenton, Presqu'île du Vivier, Laboratoire de Physiologie des Invertébrés Marins, Ifremer, 29840 Landunvez, France (Corresponding author: E-mail:;(2) Station Expérimentale d'Argenton, Presqu'île du Vivier, Laboratoire de Physiologie des Invertébrés Marins, Ifremer, 29840 Landunvez, France |
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| Abstract: | Variations in growth and survival of hatchery-reared post-metamorphicjuveniles of great scallop Pecten maximus prompted anexamination of settlement and postlarval development. The effects ofseawater flow and temperature on great scallop metamorphosis andpostlarvae were studied over a 4–5 week period. In allexperiments, and regardless of environmental conditions, great scallopmetamorphosed after a 2–3 week period with values of 35 to70%. Subsequently, spat numbers increased slightly. Spatmortality generally occurred from the third week onward and reachedlevels as high as 30% by the fifth week under standardconditions. At 20 °C, however, 60% mortality levels wererecorded. Differences in spat growth rate, ranging from 37 to 45  mday–1, were noticed at different seawater flow ratesbut no clear tendency could be discerned. Temperature affected spatgrowth with an increase in size from 24 m day–1 at15 °C to 35 m day–1 at 18 °C. Conversely,growth was suppressed at 20 °C (14 m day–1).For optimal metamorphosis and postlarval development in great scallop, aseawater flow of 4.3 L h–1 per sieve and a temperatureof 15 °C are recommended. |
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| Keywords: | great scallop (Pecten maximus) hatchery metamorphosis seawater flow spat development temperature |
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