TECHNICAL FIELD The present invention relates to a composition for preventing contamination of biological organisms or microalgae, and a method for outdoor culture using the same. There is provided a composition for preventing bio-pollution for outdoor cultivation of a microorganism or microalgae and an outdoor culture method using the same, characterized by comprising a digestion-degradation product of an organic substance containing generator oxygen, more specifically. INDUSTRIAL APPLICABILITY According to the present invention described above, it is possible to prevent bio-contamination by killing contaminated organisms, which is a problem encountered in outdoor cultivation of microorganisms or microalgae, by using decomposition products of sub- Does not contain generator oxygen over time and can provide the decomposition product as a nutrient of an outdoor cultured organism, thereby remarkably increasing the efficiency of outdoor cultivation.
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