![]() No increase in growth was detected with either increasing photoperiod or irradiance. ![]() To detect possible acclimation of the corals to an increased light duration, rates of net photosynthesis and dark respiration were measured, hereby comparing coral colonies grown under an 8:16 hours light (150 μE m−2 s−1):dark cycle with corals grown under a 16:8 hours light (150 μE m−2 s−1):dark cycle. Temperature, salinity and feeding levels were kept constant during the experiment. Growth was determined every two weeks by measuring buoyant weight. were cultured for a period of 18 weeks at different light duration times (8 hours 150 μE m−2 s−1:16 hours dark, 12 hours 150 μE m−2 s−1:12 hours dark, 16 hours 150 μE m−2 s−1:8 hours dark, 24 hours 150 μE m−2 s−1:0 hours dark) and different irradiance levels (8 hours 150 μE m−2 s−1:16 hours dark, 8 hours 225 μE m−2 s−1:16 hours dark and 8 hours 300 μE m−2 s−1:16 hours dark). ![]() A series of nine genetically identical coral colonies of Galaxea fascicularis L. more photons), presented either as irradiance or as light duration, would result in more growth. Therefore, in this study, the question was explored whether more light (i.e. Understanding and optimizing conditions for coral growth is essential for sustainable coral aquaculture. irradiance), but also by photoperiod (i.e. However, the quantity of light that is available for daily coral growth is not only determined by light intensity (i.e. Light stimulates coral growth by the process of light-enhanced calcification, which is mediated by zooxanthellar photosynthesis. Light is one of the most important abiotic factors influencing the (skeletal) growth of scleractinian corals.
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