Three common aquaculture pollutants—ammonia, nitrite, and sulfide—individually impact the health of Pacific white shrimp (Litopenaeus vannamei)

New Study Reveals Hidden Dangers to Shrimp in Aquaculture Waters

CHINA
Monday, May 12, 2025, 00:10 (GMT + 9)

Environmental pollutants like nitrite, ammonia, and sulfide pose serious threats to shrimp health, according to new research.

A groundbreaking study published in Developmental & Comparative Immunology has shed new light on how three common aquaculture pollutants—ammonia, nitrite, and sulfide—individually impact the health of Pacific white shrimp (Litopenaeus vannamei), one of the world's most widely farmed and economically important seafood species.

As global shrimp farming intensifies to meet rising demand, maintaining water quality has become a growing concern. This latest research, titled “Uncovering the combined effects of ammonia, nitrite and sulfide on Litopenaeus vannamei: safeguarding healthy aquaculture”, addresses a major gap in existing scientific literature by examining the simultaneous impact of multiple environmental stressors rather than isolating them.

The study, conducted by a team of researchers in China, exposed healthy shrimp to controlled concentrations of ammonia (30 mg/L), nitrite (60 mg/L), and sulfide (4 mg/L), comparing the effects to a control group with no added pollutants. Over a 48-hour period, researchers assessed tissue damage, immune responses, and gene expression in the shrimp using advanced histopathological, enzymatic, and transcriptomic techniques.

Their findings were stark. All three stressors damaged vital tissues such as the hepatopancreas, midgut, gills, and muscles—with the hepatopancreas suffering the most. Notably, nitrite had the most severe overall impact, causing significant cell deformation, immune dysfunction, and the largest number of altered genes—715 in total. Ammonia followed closely, while sulfide had the least—but still notable—effects.

Specifically, all pollutant groups showed increased activity of superoxide dismutase (SOD), indicating a stress response, while total antioxidant capacity (T-AOC) dropped. Sulfide exposure led to a sharp decline in glutathione peroxidase (GSH-PX), and both ammonia and nitrite groups saw significant rises in alkaline phosphatase (AKP) activity, all pointing to compromised immune defenses.

On a molecular level, the shrimp's gene expression patterns changed dramatically. The researchers identified hundreds of differentially expressed genes affecting immune function, metabolism, and growth pathways, suggesting long-term implications for shrimp health and aquaculture sustainability.

“This study provides a comprehensive understanding of how these common water pollutants impact shrimp health, especially nitrite, which had the most damaging effect,” the authors wrote in Developmental & Comparative Immunology (Vol. 2.7).

The implications are far-reaching. By pinpointing specific biomarkers and biological pathways disrupted by poor water quality, the findings offer shrimp farmers valuable insights into improving farm management. These could include water quality monitoring, selective breeding for stress resilience, and better feed strategies to bolster shrimp immunity.

The researchers emphasize the need for further studies that explore stress responses under different farming conditions and shrimp life stages, aiming to develop even more precise interventions.

As aquaculture continues to expand, such integrative studies will be essential to protecting the health of farmed species and ensuring the industry’s long-term viability.

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