The availability of high-quality fish and shellfish larvae is crucial for the success of the aquaculture industry, as it directly impacts the performance and survival rates of the animals in the growth-out phase , thereby impacting the industry´s economic viability a nd sustainability. While many fish and shellfish larvae are produced in the hatcher ies, their survival rates are often low or highly variable, and the potential of the (shell)fish to reach their genetically predetermined maximum growth is never fully reached. Stress induced by negative interactions between the larvae, microbial communities, and the environment is the major reason for the poor viability, quality, and even mortality during larval rearing. There has been a continuous effort to develop new and effective strategies to produce high-quality (shell)fish larvae. Over the past decade, our research group has focused on investigating specific nutraceuticals derived from natural and sustainable sources with adaptogenic properties. Here, we present findings from studies conducted in laboratory and semi-industrial settings by our research group and others, highlighting the effectiveness of a nutraceutical formulation in building robustness in both fish and shrimp larvae against stress ors arising from environmental and pathogenic factors.