Uptake of Nitrate-Nitrogen in Intensive Shrimp Culture Ponds by Sterile Ulva sp.

摘要

We studied nitrate-nitrogen uptake by sterile Ulva sp.under various conditions including tropical ones.The Sterile Ulva sp.,which was collected from Yokohama,Japan,removed nitrate-nitrogen in the culture medium.The algae took in nitrate-nitrogen even without light.The uptake rate of nitrate-nitrogen decreased with the increase of the nitrate-nitrogen content in algal cells.The ambient ammonia-nitrogen lowered the rate of nitrate-nitrogen uptake,whereas the ambient nitrate-nitrogen did not affect the ammonia-nitrogen uptake.