Seaweed aquaculture (nutrient studies)
1999
Jacinto, G.S. (Philippines Univ. Diliman, Diliman, Quezon City (Philippines). Marine Science Inst.)
This study focused on the responses of the red alga, Kappaphycus alvarezii to varying concentrations of inorganic nutrients and levels of water movement. The seaweed is able to increase utilization of nutrients, only in the presence of adequate water movement. High levels of nutrients were found to be ineffective in increasing productivity under minimal water motion. Pulse feeding of different levels of combined inorganic nutrients under high water motion resulted in significant increases in its physiological responses as photosynthetic and respiration rates which are indicators of the alga's tolerance to its natural environment. In support of this, high growth rates and uptake rates were also demonstrated. Water movement is important in choosing sites for farming of the red seaweed. High water movement in a seaweed culture area compensate for low supply of nutrients. On the other hand, very high nutrient concentrations (as in artificially fertilized areas) may not necessarily ensure good growth of the seaweed in the absence of adequate water movement. The water movement which build up between the water and algal tissue affected the availability of nutrients for uptake by the algae
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