Sodium lactate, a food additive, significantly improves growth and survival in young catfish exposed to ammonia-contaminated water, according to a 2026 study published in Aquaculture Nutrition. Gram Research analysis shows that fish fed 1% sodium lactate-supplemented food for 8 weeks grew substantially better under ammonia stress, with enhanced digestive enzyme activity and stronger antioxidant protection in their livers. The supplement works by improving digestion, regulating metabolism, and reducing oxidative damage from ammonia toxicity.
According to Gram Research analysis, a new study shows that adding sodium lactate (a type of salt) to fish food helps young catfish survive in polluted water with high ammonia levels. Researchers fed some fish regular food and others food with sodium lactate, then exposed them to ammonia-contaminated water for 8 weeks. The fish that ate the sodium lactate-enhanced food grew better, had stronger digestion, and their bodies handled the toxic ammonia more effectively. This finding could help fish farmers protect their fish in poor water conditions and might even have applications for other animals dealing with environmental stress.
Key Statistics
A 2026 research study of 360 juvenile yellow catfish found that dietary sodium lactate supplementation at 1% significantly improved growth rates and feed efficiency in fish exposed to chronic ammonia stress over 8 weeks.
According to Gram Research analysis of the 2026 aquaculture study, sodium lactate supplementation enhanced intestinal lipase and pepsin enzyme activities, improving the fish’s ability to digest fats and proteins while under ammonia stress.
The 2026 study demonstrated that sodium lactate-fed fish showed substantially improved hepatic antioxidant capacity and reduced oxidative damage markers compared to control fish exposed to 2.5 mg/L ammonia nitrogen.
Research from 2026 involving 360 catfish revealed that dietary sodium lactate downregulated the mstn growth-suppressive gene, helping fish maintain muscle development even under chronic ammonia exposure.
The Quick Take
- What they studied: Whether adding sodium lactate (a food supplement) to fish feed could protect young catfish from ammonia poisoning in their water
- Who participated: 360 healthy juvenile yellow catfish weighing about 1.64 grams each, divided into 4 groups and kept in controlled tanks for 8 weeks
- Key finding: Fish fed sodium lactate-supplemented food grew significantly better and showed less damage from ammonia exposure compared to fish on regular food, with improved digestion and stronger antioxidant protection
- What it means for you: This research suggests sodium lactate could be a practical, affordable way to help farmed fish survive in less-than-ideal water conditions. While this study focused on catfish, the mechanism might apply to other aquaculture species, though more research in real-world farm settings is needed
The Research Details
Researchers conducted a controlled 8-week experiment with 360 young catfish divided into 4 equal groups. Each group had 3 separate tanks with 30 fish per tank to ensure reliable results. Two groups ate regular fish food while two groups ate the same food with 1% sodium lactate added. Additionally, two groups (one with regular food, one with sodium lactate food) were exposed to ammonia-contaminated water at 2.5 mg/L, while the other two groups lived in clean water. This setup allowed researchers to see exactly how sodium lactate affected fish both in normal and stressful conditions.
The researchers measured multiple outcomes including how much the fish grew, how efficiently they converted food to body weight, and various biological markers of health. They examined digestive enzyme activity, blood chemistry, liver function, and even looked at which genes were turned on or off in the fish’s muscles and liver. This comprehensive approach helped them understand not just whether sodium lactate worked, but how it worked at a biological level.
This research design is important because it mimics real-world aquaculture challenges. Fish farms often deal with water quality problems including ammonia buildup from fish waste. By testing sodium lactate in controlled conditions, researchers could isolate its specific benefits without other variables interfering. The inclusion of molecular-level analysis (gene expression) helps explain the mechanism, making the findings more credible and potentially applicable to other species and situations
This study has several strengths: it used a reasonable sample size (360 fish), included proper control groups, used replicate tanks to ensure consistency, and measured outcomes at multiple biological levels (growth, digestion, blood chemistry, and genes). The study was published in a peer-reviewed journal focused on aquaculture nutrition. However, the study was conducted in laboratory conditions, which may not perfectly reflect how fish perform in actual farm environments. The research focused on one fish species, so results may not automatically apply to other types of fish
What the Results Show
Fish that received sodium lactate-supplemented food showed significantly better growth compared to fish on regular food, even when exposed to ammonia stress. The sodium lactate group also showed improved feed efficiency, meaning they converted their food into body weight more effectively. In the ammonia-exposed groups, the difference was even more dramatic—fish without sodium lactate supplementation experienced severe growth problems, while those with the supplement maintained much better growth rates.
At the digestive level, sodium lactate boosted the activity of two important digestive enzymes: lipase (which breaks down fats) and pepsin (which breaks down proteins). This improved digestion likely helped the fish absorb more nutrients from their food, supporting better growth. Interestingly, the enzyme that breaks down carbohydrates (amylase) didn’t change significantly, suggesting sodium lactate specifically targets fat and protein digestion.
The fish that received sodium lactate showed stronger antioxidant defenses in their livers, meaning their bodies were better equipped to handle the toxic effects of ammonia. Blood chemistry tests revealed that sodium lactate improved various health markers and reduced signs of metabolic stress. At the genetic level, sodium lactate modified how genes related to glucose metabolism and muscle growth were expressed, essentially helping the fish’s bodies prioritize growth and energy management even under stress.
Sodium lactate downregulated a gene called mstn (myostatin), which is known to suppress muscle growth. By reducing the activity of this growth-suppressing gene, sodium lactate may have created conditions more favorable for muscle development. The supplement also helped regulate the fish’s glucose metabolism, suggesting it improved overall energy management. These secondary findings indicate that sodium lactate works through multiple biological pathways, not just one mechanism
While this appears to be the first study specifically examining sodium lactate in yellow catfish under ammonia stress, the findings align with broader research showing that organic acids and their salts can improve fish health and stress resistance. Previous studies have shown that various feed additives can enhance antioxidant capacity and digestive function in fish. This research extends that knowledge by demonstrating sodium lactate’s specific benefits against ammonia toxicity and by identifying the molecular mechanisms involved
This study was conducted in controlled laboratory conditions with carefully managed water quality and feeding schedules. Real fish farms may have more variable conditions that could affect results. The research focused on juvenile yellow catfish, so the benefits may not be identical in other fish species or at different life stages. The study lasted 8 weeks, which is relatively short-term; longer studies would help confirm sustained benefits. Additionally, the study didn’t examine the cost-effectiveness of sodium lactate supplementation compared to other methods of managing ammonia stress, which would be important for practical farm application
The Bottom Line
Based on this research, fish farmers could consider adding 1% sodium lactate to feed as a practical strategy to protect fish in ammonia-stressed conditions. The evidence is strong for this specific fish species under these conditions (confidence level: moderate to high for yellow catfish; lower for other species pending additional research). This approach appears safe, as no negative effects were reported in the study. However, farmers should start with small-scale trials before implementing farm-wide changes, and should continue monitoring water quality management as the primary strategy
Fish farmers and aquaculture operations would benefit most from this research, particularly those dealing with water quality challenges or high-density farming systems where ammonia buildup is common. Researchers studying stress responses in fish and feed additive effectiveness should also find this relevant. Pet fish enthusiasts with high-density aquariums might explore similar approaches, though this specific product would need to be adapted for that use. People interested in sustainable food production and improving aquaculture efficiency would find this research meaningful
Based on the 8-week study period, fish farmers could expect to see measurable improvements in growth and health within 4-6 weeks of implementing sodium lactate supplementation. However, the full benefits to antioxidant capacity and metabolic regulation may take the full 8 weeks to fully manifest. Long-term benefits and sustainability of the effect beyond 8 weeks remain unknown and would require additional research
Frequently Asked Questions
Can sodium lactate help fish survive in polluted water with ammonia?
Yes, according to a 2026 study, sodium lactate supplementation at 1% in fish feed significantly improved growth and survival in catfish exposed to ammonia-contaminated water. The supplement enhanced digestive function and antioxidant defenses, protecting fish from ammonia toxicity.
How does sodium lactate protect fish from ammonia stress?
Sodium lactate works through multiple mechanisms: it boosts digestive enzymes (lipase and pepsin) for better nutrient absorption, strengthens the liver’s antioxidant defenses to combat ammonia-induced damage, and regulates genes involved in metabolism and muscle growth.
What dosage of sodium lactate should be used in fish feed?
The 2026 study used 1% sodium lactate supplementation in fish feed and found it effective for juvenile yellow catfish. However, optimal dosages may vary by fish species, age, and specific conditions, so consultation with aquaculture specialists is recommended before farm-wide implementation.
How long does it take to see benefits from sodium lactate supplementation?
The 8-week study showed measurable improvements in growth and health markers within this timeframe. Fish farmers might expect to observe initial growth improvements within 4-6 weeks, though full metabolic and antioxidant benefits may require the complete 8-week period.
Does sodium lactate work for all types of fish or just catfish?
This study specifically tested yellow catfish, so results are most reliable for that species. The underlying biological mechanisms suggest potential benefits for other fish species, but additional research is needed to confirm effectiveness and optimal dosages for different fish types.
Want to Apply This Research?
- Track weekly fish growth measurements (average weight gain per week), feed conversion ratio (amount of feed needed to gain 1 pound of body weight), and water ammonia levels (mg/L). Compare these metrics between control and sodium lactate-supplemented groups to quantify the supplement’s real-world effectiveness on your farm
- If managing an aquaculture operation, implement a feed additive protocol: order sodium lactate supplement, calculate the correct 1% concentration for your feed volume, mix thoroughly into feed batches, and establish a consistent feeding schedule. Document the date supplementation begins and monitor fish health daily for any changes in behavior or appearance
- Establish a baseline of current growth rates and water quality metrics before adding sodium lactate. Then track weekly measurements for at least 8 weeks (matching the study duration) to determine if you see similar improvements. Create a simple spreadsheet with columns for date, average fish weight, feed amount used, ammonia levels, and observed health indicators. Compare your results to the baseline to assess whether sodium lactate is delivering expected benefits in your specific conditions
This research focuses on juvenile yellow catfish in controlled laboratory conditions and should not be considered medical advice for humans or pets. While sodium lactate appears safe based on this study, fish farmers should consult with aquaculture specialists and veterinarians before implementing new feed additives. Results may vary in real-world farm conditions. This article summarizes scientific research but does not constitute professional aquaculture or veterinary guidance. Always follow local regulations regarding feed additives and water quality management.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.