In large-scale cultures, contaminationby rogue organisms is a serious problem often resulting insignificant economic losses [67]. In tropical Australia, thefreshwater cyanobacterium Pseudanabaena limnetica rapidly outcompetesand dominates other microalgal species in culture. The observed broad salinity tolerance of P. atomus, with minimal effectson productivity or biochemical profiles, allows the use of salinitymanipulations to inhibit or reduce culture contamination by rogueorganisms. Although increased culture salinity does not completelyprevent the development of P. limnetica, it does delay itsestablishment and subsequent logarithmic growth at 28 and 36ppt up to day 8. It is noteworthy however, that while establishmentof P. limnetica at high salinities is considerably slower, onceestablished, growth rates are high and culture take-over will occur.The extended time for establishment and logarithmic growth of P.limnetica provides an extended opportunity to harvest the biomasswith low levels of contamination, which is an important aspect forend product quality control.
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