Year by year, the global aquaculture sector witnesses a steady rise in production, rendering it the swiftest and most dependable means to combat protein deficiency on a global scale. Many nations have embraced a plethora of innovative strategies for integrating and intensifying the cultivation of both finfish and shellfish. Emphasis on nutrition and feeding is essential for fostering economically viable and sustainable aquaculture practices. Attaining sustainable production of aquatic organism’s hinges upon the formulation and manufacture of artificial feeds that are not only cost-effective and low in pollution but also rich in essential nutrients. Analogous to terrestrial creatures, aquatic organisms necessitate an array of approximately 40 vital nutrients, encompassing proteins, carbohydrates, fatty acids, vitamins, minerals, growth promoters, and other indispensable energy sources vital for the sustenance of growth, reproduction, and other physiological functions. The advent of novel species-specific dietary formulations serves as a pillar of support for the burgeoning aquaculture industry, catering to the escalating demand for affordable, safe, and premium-grade fish and seafood products. In the last twenty years, scholarly efforts have considerably enriched our comprehension of the dietary needs of cultivated fish. This paper serves as a thorough exposition of the basic principles of fish nutrition within the realm of aquaculture. Discrepancies in dietary requirements can be observed depending on various factors including water temperature (warm or cold), species classification (finfish or shellfish), and habitat (marine or freshwater). Achieving superior fish output hinges on the supply of feeds that are nutritionally well-rounded.