Since biological pollutions during microalgae cultivations cannot
be avoided, is there ways to control the pollutions in a certain
limits that target microalgal species can be continuously reproduced
and take the majorities in the symbiotic system? Stress
resistance of species and its enhancement, specific inhibitor and
environmental conditions of biological contaminations, reasonable
cultivation technology and monitoring of pollution degree would
probably promote industrialization of microalgae cultivation in
the future. But prior to that, many relevant mechanism problems
especially focused on economic microalgae species must be
resolved by further researches.