A 2026 study published in Scientific Reports found that adding 1% jamun leaf meal to catfish feed significantly improved growth and disease resistance. Fish fed this supplement gained more weight (16.46 grams average), had stronger immune systems, and achieved 87.67% survival when exposed to harmful bacteria—substantially higher than control fish. Jamun leaves contain natural compounds like flavonoids and antioxidants that protect fish from stress and infection, making this a promising natural supplement for aquaculture.
Researchers tested whether jamun leaf meal—a natural plant supplement—could help young catfish grow better and stay healthier. According to Gram Research analysis, fish fed a diet containing 1% jamun leaf meal gained more weight, had better immune systems, and survived disease better than fish on regular diets. The study found that jamun leaves contain helpful compounds like flavonoids and antioxidants that protect fish from stress and infection. After 60 days of feeding, fish on the jamun diet showed 87.67% survival when exposed to harmful bacteria, compared to much lower survival in control groups. This research suggests jamun could be a natural, cost-effective way to improve fish farming.
Key Statistics
A 2026 research article in Scientific Reports found that young catfish fed 1% jamun leaf meal achieved 87.67% survival when exposed to Aeromonas hydrophila bacteria, compared to significantly lower survival rates in control groups receiving no jamun supplement.
According to research reviewed by Gram, catfish fed 1% jamun leaf meal gained an average of 16.46 grams over 60 days with a feed conversion ratio of 1.34, meaning they converted food to body weight more efficiently than control fish.
A 2026 study of dietary jamun leaf meal in Pangasius catfish found that the 1% inclusion level produced a specific growth rate of 1.41% per day and a protein efficiency ratio of 2.47, significantly outperforming all other treatment groups.
Research shows that jamun leaf meal contains flavonoids, phenolic acids, terpenoids, vitamins, amino acids, and minerals that improved haematological, biochemical, immune, and antioxidant parameters in catfish before and after bacterial infection challenge.
The Quick Take
- What they studied: Whether adding jamun leaf powder to fish food helps young catfish grow faster, develop stronger immune systems, and survive bacterial infections better.
- Who participated: Young Pangasius catfish (fingerlings) divided into five groups, each fed different amounts of jamun leaf meal (0%, 0.5%, 1%, 1.5%, or 2%) for 60 days.
- Key finding: Fish fed 1% jamun leaf meal grew 16.46 grams on average and had 87.67% survival rate when exposed to harmful bacteria, significantly better than fish on regular feed.
- What it means for you: If you raise fish commercially, jamun leaf meal could be an affordable natural supplement to improve fish health and reduce disease losses. For consumers, this suggests farmed fish raised with natural supplements may be healthier. However, results are specific to this fish species and may not apply to other types of fish or animals.
The Research Details
Scientists created five different fish diets with increasing amounts of jamun leaf meal (0%, 0.5%, 1%, 1.5%, and 2%) while keeping the protein and calories the same across all diets. They fed these diets to separate groups of young catfish for 60 days, measuring how much the fish grew, how healthy their blood was, and how strong their immune systems became. After the 60-day feeding period, they exposed all fish to a harmful bacteria called Aeromonas hydrophila to see which groups could fight off the infection best.
Before testing with bacteria, researchers checked the fish’s blood cells, liver function, immune markers, and antioxidant levels. They also measured how efficiently the fish converted food into body weight. After the bacteria challenge, they tracked which fish survived and measured stress chemicals in their blood like glucose and cholesterol.
This research design is important because it tests jamun leaf meal under controlled conditions where scientists can isolate its effects. By keeping protein and calories equal across all diets, they proved that any differences came from jamun itself, not from different nutrition levels. Testing both before and after a disease challenge shows whether jamun actually strengthens immune defenses, not just general health.
The study was published in Scientific Reports, a peer-reviewed journal, which means other scientists reviewed the work before publication. The researchers used proper scientific methods with multiple treatment groups and measured many different health markers. The specific growth rate and survival percentages are clearly reported with standard deviations, showing the data was carefully collected. However, the exact number of fish in each group wasn’t specified in the abstract, and results are specific to one catfish species, so results may not apply to other fish types.
What the Results Show
Fish fed 1% jamun leaf meal showed the best growth results, gaining an average of 16.46 grams over 60 days with a specific growth rate of 1.41% per day. These fish also converted food into body weight most efficiently, with a feed conversion ratio of 1.34, meaning they needed less food to gain weight compared to control fish. The protein efficiency ratio was 2.47, indicating their bodies used protein very effectively for growth.
Before the bacteria challenge, fish on the 1% jamun diet had significantly better blood health markers, stronger immune responses, and higher antioxidant levels—the body’s natural defense against damage. These improvements suggest jamun leaf meal strengthened their internal defenses before they even faced infection.
When exposed to harmful bacteria, the 1% jamun group showed remarkable resilience. Their survival rate reached 87.67%, meaning nearly 9 out of 10 fish survived the infection. In contrast, control fish (no jamun) had much lower survival rates. Additionally, fish on jamun diets showed lower stress markers like glucose and cholesterol after infection, indicating their bodies handled the infection stress better.
Fish fed 0.5%, 1.5%, and 2% jamun leaf meal also showed improvements over the control group, but not as dramatically as the 1% group. This suggests there’s an optimal amount of jamun to add—too little doesn’t provide full benefits, and too much may not be better. The liver enzymes in control fish were significantly elevated after infection, suggesting their livers were stressed, while jamun-fed fish maintained more normal liver function. Blood cholesterol and triglycerides were also better controlled in jamun groups, indicating improved metabolic health.
This research builds on growing evidence that plant-based supplements can boost fish health. Previous studies have shown that various plant extracts improve immune function in fish, but this is one of the first to specifically test jamun leaf meal in catfish. The survival rate improvement (87.67% vs. much lower control) is substantial compared to typical results from other natural supplements. The study confirms what traditional medicine has long suggested—that jamun has protective properties—but now with scientific evidence in a modern aquaculture context.
The study only tested one fish species (Pangasius catfish), so results may not apply to other fish types like tilapia, salmon, or ornamental fish. The abstract doesn’t specify exactly how many fish were in each group, making it harder to judge the study’s statistical power. The research was conducted in controlled laboratory conditions, which may differ from real fish farms with varying water quality and stress levels. The study tested only one bacterial species (Aeromonas hydrophila), so jamun’s effectiveness against other diseases is unknown. Additionally, the cost-benefit analysis of using jamun leaf meal compared to other supplements wasn’t evaluated.
The Bottom Line
Fish farmers raising Pangasius catfish should consider adding 1% jamun leaf meal to their feed as a natural immune booster and growth promoter (high confidence for this species). The evidence strongly supports improved growth and disease resistance at this specific inclusion level. For other fish species, results are uncertain and would require additional testing. Consumers interested in supporting sustainable aquaculture may prefer farmed fish raised with natural supplements like jamun over those raised with synthetic additives.
Commercial catfish farmers will benefit most from this research, as it offers a practical way to reduce disease losses and improve growth rates. Aquaculture researchers and feed manufacturers should take note as a potential new ingredient. Fish hobbyists raising catfish might experiment with jamun supplements, though results in home aquariums may differ. People concerned about sustainable, natural food production should care about this as evidence that plant-based solutions can replace some synthetic additives in animal farming.
Growth improvements appear within the 60-day study period, with fish showing better weight gain and feed efficiency by the end. Immune system strengthening likely occurs gradually over weeks, with full benefits visible by 4-6 weeks based on the study timeline. Disease resistance improvements would be noticed when fish are exposed to infection, which in this study occurred after 60 days of feeding. In a real farm setting, farmers might see reduced disease outbreaks within 2-3 months of switching to jamun-supplemented feed.
Frequently Asked Questions
Does jamun leaf meal actually help fish grow faster and healthier?
Yes, research shows fish fed 1% jamun leaf meal gained more weight (16.46g average), converted food more efficiently, and had stronger immune systems compared to control fish. The 87.67% survival rate during bacterial infection was significantly higher than untreated fish, demonstrating real health benefits.
What’s the best amount of jamun leaf meal to add to fish feed?
The study found 1% jamun leaf meal inclusion produced the best results for growth and disease resistance. Lower amounts (0.5%) showed some benefits but not optimal results, while higher amounts (1.5-2%) didn’t improve outcomes further, suggesting 1% is the ideal dose.
Will jamun leaf meal work for all types of fish?
This study specifically tested Pangasius catfish, so results are confirmed for that species. Whether jamun works equally well for other fish types like tilapia, salmon, or goldfish remains unknown and would require separate research testing.
How long does it take to see improvements from jamun leaf meal in fish?
The study measured results after 60 days of feeding, showing significant growth and immune improvements by that point. Immune strengthening likely begins within 4-6 weeks, while disease resistance benefits would appear when fish face infection challenges.
Is jamun leaf meal safe for fish and does it have side effects?
The study showed no negative effects at the tested inclusion levels (up to 2%). Fish on jamun diets had better liver function and lower stress markers than controls, suggesting it’s safe. However, long-term safety studies beyond 60 days haven’t been reported.
Want to Apply This Research?
- If tracking fish farm performance, record weekly weight measurements of fish on jamun-supplemented feed versus control feed, tracking the specific growth rate percentage. Monitor disease outbreak frequency and survival rates during disease challenges. Log feed consumption amounts to calculate feed conversion ratios.
- For fish farmers: Switch 25% of your catfish population to 1% jamun leaf meal supplemented feed for 60 days while keeping the rest on standard feed. Compare growth rates, health markers, and disease resistance between groups. For consumers: Look for farmed catfish labeled as raised with natural plant-based supplements and track any quality differences you notice.
- Establish a baseline of current fish growth rates, disease frequency, and mortality rates. After introducing jamun leaf meal, measure the same metrics monthly for at least 6 months to see if improvements match the study results. Track feed costs and jamun supplement costs to calculate return on investment. Monitor fish blood work or health indicators quarterly if possible through a veterinary partner.
This research specifically applies to young Pangasius catfish (fingerlings) in controlled laboratory conditions. Results may not apply to other fish species, different life stages, or commercial farm environments with varying water quality and stocking densities. Before implementing jamun leaf meal in commercial operations, consult with aquaculture specialists and conduct small-scale trials. This research is not a substitute for professional veterinary advice or established fish health management practices. Always follow local regulations regarding feed additives and supplements in aquaculture. Individual results may vary based on water conditions, fish genetics, and farm management practices.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.