Stocking density in ornamental fish farming refers to the number of fish kept in a particular space, which directly influences their growth, health, and reproduction. High stocking densities can cause overcrowding, leading to poor water quality, disease outbreaks, and increased stress levels among fish. Conversely, lower stocking densities may reduce productivity, leading to inefficient use of space and resources. Maintaining an optimal stocking density ensures that fish have adequate space for growth and minimizes the risks of disease. The ideal density varies by species and system design, requiring careful monitoring of water conditions, feeding practices, and fish health.