Анотация: This technical report is part of the FAO-TZ project Support to Seaweed Diseases and Die-off Understanding and Eradication in Zanzibar TCP/URT/3601/C1, and covers an initial analysis of the die-offs due to epiphyte infestation and ice-ice disease in Zanzibar. The assessment is mainly based on site visits to the seaweed farms in Unguja and Pemba and laboratorial analysis of collected seaweed samples conducted by the authors between February and June 2017. Findings were cross-checked with a literature review on the topic and presented during stakeholders' meetings in both Islands. (FAO)