The present invention relates to an anti-algal bloom composition containing, as an active ingredient, a water-soluble free amine chitosan having an anti-algal activity against algal-bloom-inducing algae, the water-soluble free amine chitosan according to the present invention exhibiting superb anti-algal bloom activity of suppressing algal-bloom by directly inducing the elimination of algal-bloom-inducing algae, and being non-toxic to the cells of the organisms in the water, the anti-algal bloom composition, containing the water-soluble free amine chitosan as an active ingredient, can be effectively used as a safe anti-algal bloom composition in fresh-water ecosystems such as solidified dams, reservoirs, lakes, golf course hazards, ponds, fresh-water aqua-farms and fishing sites.Linvention concerne une composition de lutte contre la prolifération des algues contenant, pour principe actif, un chitosane hydrosoluble à amines libres ayant une activité contre les algues inductrices dalgues, le chitosane hydrosoluble à amines libres selon linvention présentant une activité anti-prolifération dalgues en déclenchant directement lélimination des algues inductrices, et non toxique vis-à-vis des cellules des organismes dans leau, la composition anti-prolifération des algues contenant le chitosane hydrosoluble à amines libres pour principe actif pouvant être utilisée efficacement comme composition anti-prolifération dalgues dans des écosystèmes deau douce comme les barrages solidifiés, les réservoirs, les lacs, les terrains de golf, les bassins, les installations de pisciculture et les sites de pêche.본 발명은 녹조유발 조류에 대한 항조류 활성을 갖는 수용성 유리 아민 키토산을 유효성분으로 함유하는 항녹조용 조성물 및 이의 제조방법에 관한 것으로, 본 발명에 따른 수용성 유리 아민 키토산은 녹조유발 조류를 직접적으로 사멸을 유도함으로써 녹조를 억제하는 우수한 항녹조 활성을 나타낼 뿐만 아니라, 담수 생물 내의 세포에 대하여 무독성이므로 이를 유효성분으로 함유하는 항녹조용 조성물은 고형화된 댐, 저수지, 호수, 골프장 헤저드, 연못, 민물 양식장, 낚시터 등과 같은 담수 생태계에 안전한 항녹조용 조성물로 유용하게 사용될 수 있다.
