Mean valve gape and standard deviation under conditions with (fed) and without (starved) food. Mean valve gape was measured during the entire run and during periods with open valves only, to determine whether gape width is larger when valves are opened under conditions with and without food). Norwegian oysters are indicated N1 to N4 and oysters from the Grevelingen G1 to G3.
|Date (day/month)||Experiment||Treatment||Entire Run||Valve gape > 0.2|
|Tank1||Tank2||MeanTank1 (SD)||MeanTank2 (SD)||MeanTank1 (SD)||MeanTank2 (SD)|
|20/08–27/08||Starvation||Fed||Starved||0.50 (0.34)*||0.17 (0.25)*||0.67 (0.22)||0.53 (0.09)|
|27/08–03/09||Recovery fed||Fed||Fed||0.34 (0.29)||0.46 (0.32)|
|03/09–12/09||Starvation||Fed||Starved||0.58 (0.31)*||0.23 (0.26)*||0.71 (0.17)||0.52 (0.12)|
|01/10–10/10||Recovery fed||Fed||Fed||0.57 (0.30)||0.50 (0.30)|
|Tank1||Tank2||Mean Nor||Mean Grev|
|27/08–03/09||Recovery fed||Fed||Fed||0.38 (0.33)||0.39 (0.27)|
|01/10–10/10||Recovery fed||Fed||Fed||0.58 (0.30)||0.49 (0.30)|
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