Global Occurrence, Co-Contamination Patterns, and Toxic Effects of Mycotoxins in Fish Feed: A Multi-Species Perspective Review

Aquaculture has become the fastest-growing food-production sector worldwide, with increasing reliance on plant-based feed ingredients such as maize, soybean, wheat, rice, and oilseed meals. Although these ingredients reduce dependence on fishmeal, they are highly susceptible to fungal contamination and subsequent mycotoxin production. Global surveys reveal widespread contamination of aquafeeds with major regulated mycotoxins, including aflatoxins, fumonisins, deoxynivalenol, zearalenone, ochratoxin A, and T-2 toxin, alongside emerging toxins such as enniatins, beauvericins, and sterigmatocystin metabolites. Aflatoxin B1 is the most prevalent and toxic mycotoxin, with contamination prevalence often exceeding 80–100% in Africa and Asia with contamination levels surpassing 400 µg/kg in some regions of these continents. Fumonisins, deoxynivalenol, and zearalenone are also commonly detected, with fumonisins levels occasionally exceeding 7000 µg/kg. Mycotoxins induce diverse toxic effects in fish, including growth suppression, hepatotoxicity, nephrotoxicity, immunosuppression, oxidative stress, reproductive dysfunction, and mortality. Collectively, these findings highlight the urgent need for improved surveillance, feed management, and harmonized regulations addressing multi-mycotoxin exposure to safeguard aquaculture productivity, fish, and public health. This review synthesizes current knowledge on the global mycotoxin contamination patterns, analytical detection methods in fish feed and processed seafood as well as the toxicological effects of mycotoxins, with emphasis on species-specific responses and food safety implications.