Modern aquaculture is essential for meeting the increasing global demand for fish and seafood, but its rapid expansion has exposed limitations that threaten long-term sustainability. Major challenges include high disease outbreaks, low nutritional efficiency, and the instability and poor solubility of nutraceuticals and plant-derived compounds. These challenges often create a self-reinforcing feedback loop, amplifying the detrimental effects of one another. Conventional approaches, including antibiotics, chemical treatments, aquafeeds, and chemotherapeutic agents, have shown limited effectiveness, partly due to inefficient delivery systems that can contribute to environmental contamination and antimicrobial resistance. This review discusses nanotechnology-enabled strategies to improve these traditional methods, focusing on nanocarriers and nanoencapsulation techniques, and also mentioning other synthetized nanoparticles and microencapsulation strategies. These systems have succeeded in reducing oxidative degradation and improving bioavailability by enhancing the stability and activity of encapsulated bioactives. The review also evaluates their functional performance, limitations, environmental effects, interactions with different organisms, and regulatory constraints in the industry. Overall, while safe and scalable use of biodegradable nanoscale delivery systems in modern aquaculture has shown great potential, it still depends on careful design, harmonized regulations, and economically feasible manufacturing.
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