Amababi yangiza
Rimwe na rimwe nti bisobanutse icyateye HABs yihariye kuko ibibera ahantu hamwe bigaragara ko ari ibintu bisanzwe,  mu gihe ahandi bigaragara ko ari ibisubizo byi bikorwa bya bantu.  Mu turere tumwe na tumwe hari aho uhurira na bashoferi nki ntungamubiri, ariko  nazo zabayeho kuva mbere yuko abantu batangira kugira ingaruka kubidukikije. HABs iterwa na eutrophication, ikaba ari intungamubiri nyinshi mu mazi. Intungamubiri ebyiri zikunze kugaragara ni azote ( nitirate, ammonia, na urea ) na fosifate .  Intungamubiri zirenze urugero zitangwa n'ubuhinzi, umwanda w’inganda, gukoresha ifumbire ikabije mu mijyi / mu mijyi, hamwe no gutemba kw'imijyi . Ubushyuhe bwo hejuru bwamazi no gutembera gake nabyo bigira uruhare.

Ibisobanuro no kubiranga 
Irashobora kugaragara nkifuro, ibibyimba, cyangwa mateli hejuru cyangwa munsi yubutaka bwamazi kandi irashobora gufata amabara atandukanye bitewe nibibara.  ibiro byimshwe irabya mu biyaga cyangwa imigezi y'amazi meza bishobora kugaragara nk'icyatsi kibisi, akenshi gifite imirongo igaragara isa n'irangi ireremba.  Indabyo za Cyane bacteriya nikibazo cyisi yose.

Amagambo

Ubwoko 

Ibidukikije