The presentation addresses the risks associated with toxic algae in the industrial production of micro- and macroalgae. It explores harmful algal blooms (HABs) and their environmental, public health, and economic impacts. The presentation discusses toxic algae, their toxins, and the risk of contamination of non-toxic algae during production. Food chain concerns, particularly regarding food and feed safety, are highlighted, along with HACCP considerations for mitigating risks in commercial algal production. Lastly, the potential biotech applications of toxic microalgae are examined, offering insight into their possible benefits despite the risks.