Modular system pond cultivation model for the survival of milkfish (Chanos chanos): case study of Pangkajene Kepulauan Regency, Indonesia

This study aims to analyze survival rates in milkfish modular cultivation systems and their correlation with fluctuations in temperature and salt content. The modular system method was used, with three plots: plot A as the nursery plot, plot B as the first rearing plot, and plot C as the enlargement plot 2. The research was conducted over 1 year with three maintenance cycles, each cycle lasting 4 months. The organisms were placed in plot A for a period of 1–8 months. Thus, in 1 year, plot A gets the opportunity to rest for 4 months while preparing, then in grow-out plot 1 and grow-out plot 2 for 2 months each, so that each grow-out plot gets the opportunity to rest while preparing for the next maintenance cycle. Results revealed that the temperature, salt content, pH, and dissolved oxygen were within the optimal range, with an average value of 29.4 °C, pH of 6.9, and dissolved oxygen of 31 ppm. However, the salt content fluctuated a lot, with values ranging between 5 and 45 ppt with an average value of 26.9 ppm. The average survival rate was 91% with a correlation of R = 0.906 (cycle 1), 95% with a correlation of R = 0.890 (cycle 2), and 97% with a correlation of R = 0.997 (cycle 3). To conclude, the modular cultivation system, apart from increasing survival rates, can also improve the pond soil environment. This system is highly suitable as a promising approach for sustainable fisheries development in the region.