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The red seaweed Gracilaria fisheri has been used for human food, for marine animal feeding, and for agar extraction. This algal species is extensively cultured, but its production is often unpredictable due to lack of basic biological information on this species. This work aims to determine the effects of irradiance, salinity and temperature on the photosynthesis of this species. Plants were subjected to different irradiance (0–1150 µmol photons.m-2.s-1), salinity (15–40‰), and temperature (12–40°C) levels in a growth chamber. Photosynthesis was determined using a dissolved oxygen sensor and pulse amplitude-modulated fluorometry. The results showed rapid light curves increasing with irradiance up to 1150 μmol photons.m-2.s-1. The highest Pnet was obtained at 203 µmol photons.m-2.s-1, temperature 24oC and a salinity of 30‰, which also corresponded to the highest maximum quantum yield. Our study revealed that the Pnet rates were highest from 24–28°C at an irradiance of 203 µmol photons.m-2.s-1 and was lower at higher and lower temperatures.
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