Polyculture of red seaweed (Gracilaria tenuistipitata) with different stocking densities of whiteleg shrimp (Litopenaeus vannamei): Effects on water qualityand shrimp performance

This study was conducted to determine the impact of coculturing red seaweed (Gracilaria tenustipitata) with different densities of whiteleg shrimp (Litopenaeus vannamei) on water quality and shrimp performance. The experiment was carried out in indoor tank systems in triplicate. Five shrimp densities (100, 200, 300, 400, and 500 shrimp/m3) were integrated with red seaweed (2 kg/m3) for 60 days. The results demonstrated that polyculture of red seaweed with shrimp maintained appropriate levels of TAN and NO2- in rearing tanks at high shrimp densities ranging from 100 to 300 shrimp/m3. Shrimp growth rates tended to decline as density increased, but there were no statistical differences (p>0.05) between treatments at stocking densities ranging from 100 to 300 shrimp/m3. Shrimp survival declined dramatically as stocking densities increased from 400 shrimp/m3 upward. The lowest and maximum shrimp yields were achieved at densities of 100 and 300 shrimp/m3, respectively. Furthermore, the sensory quality of cooked shrimp meat was highly rated by the panelists. These findings demonstrated that polyculture of red seaweed with whiteleg shrimp can be applied at stocking densities up to 300 shrimp/m3 while maintaining appropriate water quality parameters and improved production efficiency in the culture unit.