What is an effective method to minimize disease in aquaculture?

Regular health screening is a crucial method for minimizing disease in aquaculture. This practice involves systematic monitoring of the fish or shellfish populations to detect any signs of illness early, allowing for prompt intervention. By regularly assessing the health status of aquatic organisms, technicians can identify pathogens or conditions that may pose a threat, implement management strategies, and maintain biosecurity measures to prevent the spread of disease.

Timely health screenings can lead to better overall management of the aquatic environment, ensuring that any emerging health issues are addressed swiftly. This proactive approach not only protects the overall health of the populations but also supports the sustainability and profitability of aquaculture operations.

Other methods mentioned in the options, like using chemical fertilizers or limiting water changes, do not address disease directly and may potentially lead to environmental stress, which can exacerbate health problems in aquatic species. Increased stocking density is generally associated with higher stress levels and greater susceptibility to disease due to crowded conditions. In contrast, regular health screening is focused on maintaining the well-being and longevity of the organisms in the system.