[Using chlorella and effective microorganisms to optimize aquatic ecological structure and to regulate water quality]

Area of Science:

• Aquatic Ecology
• Microbiology
• Environmental Science

Context:

• Aquaculture ponds require optimized ecological structures and water quality for sustainable production.
• Chlorella vulgaris and effective microorganisms are potential tools for ecosystem management.

Purpose:

• To evaluate the impact of Chlorella vulgaris and effective microorganisms on aquatic ecological structure and water quality in shrimp and fishponds.
• To assess the changes in plankton composition, biomass, and key water quality parameters.

Summary:

• Chlorella vulgaris addition led to its dominance, increasing its amount significantly compared to controls (CK).
• Zooplankton biomass increased by 19.3% in shrimp ponds and 2.5% in fishponds.
• Effective microorganisms, including Rhodospirillaceae, photosynthetic bacteria, and yeast, altered plankton dynamics and improved water chemistry.
• The "Saccharomycete + Nitrifying bacteria" treatment notably reduced ammonium (NH4+) concentrations to 44% of CK.
• Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) decreased to 56.5% and 38.4% of CK in shrimp ponds, respectively.
• The treatments enhanced dissolved oxygen and primary production.

Impact:

• Demonstrates a viable method for enhancing aquaculture pond ecosystems through biological interventions.
• Provides insights into the synergistic effects of microalgae and beneficial bacteria for water quality management.
• Offers potential for improving aquaculture sustainability and reducing environmental impact.