Influence of Water Quality and Phytoplankton Community on the Growth of Litopenaeus vannamei in Low-Salinity Semi-Mass Circular Ponds

Abstract

This study examines the dynamics of vannamei shrimp (Litopenaeus vannamei) cultivation in low salinity aquaculture systems, focusing on water quality parameters, plankton diversity, and shrimp growth rates. Vannamei shrimp are favored in aquaculture due to their disease resistance, rapid growth, and high survival rates. Key water quality parameters, including dissolved oxygen (DO), temperature, light intensity, pH, and salinity, were monitored over a 30-day period in low salinity ponds. The results showed significant fluctuations in these parameters, influencing shrimp health and growth. DO levels varied from 5.8 to 8.39 ppm in the morning and from 5.14 to 7.8 ppm in the afternoon. Water temperature ranged from 27.3°C to 32.3°C, light intensity from 3,170 to 66,300 lux, pH from 7.72 to 8.73, and salinity from 5 to 6 ppt. Plankton diversity and density, including species like Microcystis, Cyclotella, and Rhizosolenia, were also assessed, highlighting their role in the aquatic ecosystem. The specific growth rate (SGR) of the shrimp was calculated, showing a favorable growth rate of 2.32% per day. These findings indicate that maintaining stable water quality and diverse plankton populations is crucial for optimizing shrimp growth in low salinity aquaculture systems. This research provides valuable insights into the environmental conditions necessary for successful vannamei shrimp cultivation, emphasizing the importance of regular monitoring and management to ensure sustainable aquaculture