Nannochloropsisを摂食する鞭毛虫の駆除法について

概要

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In recent years, fish farmers have begun to culture Nannochloropsis extensively in tanks because it is one of the essential algal foods used to rear especially rotifers. However, algal grazing protozoa frequently occur and reduce the number of Nannochloropsis cells by feeding of them, thus reducing their numbers from 10million cells/ml in a single day. This phenomenon severely disrupts the food rearing process in mariculture. This protozoa is about 10μm in size, round in shape, has a colorless body, two flagella and a silicated skeletal component. Based on these characteristics, this protozoa was identified as Paraphysomonas sp. It was observed that the growth rate of Paraphysomonas increased with decreasing salt concentration in seawater. The antibiotics, Terramycin was found to repress the growth rate temporary and nickel sulfate was found to reduce a little the activity of this flagellate. It was also observed that when the salt concentration of seawater was increased and physical stress was induced by water disturbance, the growth of the flagellate was repressed as well.
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