Waste estimation and increased production of water spinach (Ipomoea reptans poir sp) in low salinity vannamei shrimp aquaponics cultivation

Abstract

Abstract Low salinity aquaponics of vannamei shrimp and water spinach is an environmentally friendly cultivation method with the advantage of converting waste into high-value plants, land efficiency, clean water efficiency, and production of healthy food. This research aimed to calculate N and P waste from feed, which becomes shrimp, the role of water spinach in absorbing total N and total P at different shrimp densities and the same density. This research compared 3 treatments, namely Treatment A) shrimp density of 1,000 ind/m3 + 20 net pots of water spinach; B) 2,000 ind/m3 + 20 net pots of water spinach; and C) 3,000 ind/m3 + 20 netpots of water spinach. Shrimp were raised in containers measuring 70cm × 40 cm × 40 cm with a volume of 50 liter, while water spinach was grown in aquariums measuring 50 cm × 40 cm × 30 cm or a volume of 50 liter. In addition, shrimp were maintained for 70 days, and water spinach was subjected to two cycles with a maintenance period of 25 days per cycle. To support shrimp growth, feed with a protein content of 30-40% was also provided at a dosage of 10-5% of the biomass weight in the morning, afternoon, and evening. The results of the research on the combination of different shrimp densities and the same water spinach density showed that the higher the density of TN and TP waste shrimp, the higher the results were, so that the efficiency of the best water spinach plants in treatment A was with the highest shrimp productivity with the lowest N and P water quality.