Pacific white shrimp need approximately 69 milligrams of vitamin B6 per kilogram of food to grow optimally and maintain strong immune systems, according to a 2026 research study. Gram Research analysis shows that shrimp fed this amount grew significantly better, had stronger disease-fighting abilities, and digested food more efficiently than those receiving less vitamin B6, with no additional benefits from higher amounts.
Researchers studied how much vitamin B6 (pyridoxine) Pacific white shrimp need to grow well and stay healthy. They fed young shrimp different amounts of this vitamin for 45 days and measured their growth, immune system strength, and digestion. According to Gram Research analysis, shrimp grew best when they got about 69 milligrams of vitamin B6 per kilogram of food. The vitamin helped their bodies fight infections, digest food better, and build stronger immune defenses. This research helps shrimp farmers create better feed that keeps their shrimp healthier and growing faster.
Key Statistics
A 2026 research study of Pacific white shrimp found that dietary vitamin B6 supplementation increased growth performance and feed efficiency up to 75 mg/kg, with the optimal requirement calculated at 69 mg/kg diet based on weight gain analysis.
Research on juvenile Pacific white shrimp showed that vitamin B6 supplementation significantly increased immune response markers including lysozyme activity, antioxidant enzyme activity, and immune cell prevalence compared to unsupplemented control diets.
A 2026 study demonstrated that shrimp fed soybean meal-based diets without vitamin B6 supplementation had significantly lower liver vitamin B6 concentrations than control groups, proving shrimp cannot synthesize adequate vitamin B6 and require dietary sources.
Digestive enzyme activities and intestinal tissue structure improved significantly in Pacific white shrimp receiving vitamin B6 supplementation, with gene expression analysis showing activation of amino acid metabolism and immune defense pathways.
The Quick Take
- What they studied: How much vitamin B6 (pyridoxine) shrimp need in their food to grow well and stay healthy
- Who participated: Young Pacific white shrimp weighing about 0.38 grams each, divided into eight groups eating different amounts of vitamin B6 for 45 days
- Key finding: Shrimp grew best when their food contained about 69 milligrams of vitamin B6 per kilogram, with more vitamin improving their immune system and digestion
- What it means for you: If you farm shrimp or work in aquaculture, this research shows the exact amount of vitamin B6 needed in feed to maximize growth and health. For consumers, healthier shrimp means better quality seafood
The Research Details
Scientists created eight different shrimp diets with varying amounts of vitamin B6, ranging from none at all to 150 milligrams per kilogram of food. They also made a special diet with an antibiotic to test whether shrimp could make their own vitamin B6 through bacteria in their gut. Young shrimp were randomly assigned to tanks and fed these diets for 45 days while researchers measured how much they grew, how well they used their food, and how strong their immune systems became.
The researchers checked multiple health markers including the shrimp’s liver vitamin levels, immune cell activity, digestive enzyme strength, and even examined genes that control vitamin B6 processing. This comprehensive approach helped them understand not just whether vitamin B6 helped, but exactly how it worked in the shrimp’s body.
Testing multiple health markers instead of just growth helps researchers understand the full picture of how vitamin B6 affects shrimp. By using a broken-line regression analysis (a statistical method that finds the exact point where more vitamin stops helping), they could pinpoint the precise amount needed rather than just saying ‘more is better’
This study used proper experimental controls, including a negative control group with antibiotics to test bacterial vitamin production. The research measured multiple outcomes (growth, immunity, digestion, gene expression) rather than relying on a single measure. Results were statistically significant (P < 0.05 or better), meaning they’re unlikely to be due to chance. The study was published in PLoS ONE, a peer-reviewed scientific journal
What the Results Show
Shrimp grew significantly better when vitamin B6 was added to their food, but only up to a certain point. Growth and feed efficiency improved most dramatically when shrimp received 75 milligrams of vitamin B6 per kilogram of diet. Beyond this amount, adding more vitamin didn’t help shrimp grow any faster—they’d reached their maximum benefit. The optimal amount was calculated to be 69 milligrams per kilogram based on weight gain patterns.
The vitamin B6 accumulated in the shrimp’s liver (hepatopancreas) in a dose-dependent way, meaning more vitamin in the food led to more stored in the liver, until it plateaued at the higher doses. Importantly, shrimp that received the antibiotic-treated diet (which prevented bacterial vitamin synthesis) had significantly lower liver vitamin levels than the control group, proving that shrimp can’t make enough of their own vitamin B6 and need it from their food.
Vitamin B6 strengthened the shrimp’s immune system across multiple measures. Lysozyme activity (an immune protein that kills bacteria), anti-protease activity (which protects immune cells), and antioxidant enzymes like superoxide dismutase and glutathione peroxidase all increased significantly with vitamin B6 supplementation. These improvements suggest shrimp fed adequate vitamin B6 would better resist infections and disease.
Digestive enzyme activities improved with vitamin B6 supplementation, meaning shrimp could break down and absorb nutrients from their food more efficiently. The structure of their intestines also improved, with better tissue organization in shrimp receiving adequate vitamin B6. Additionally, immune cells in the liver (F-cells and B-cells) increased in number with vitamin B6 supplementation, indicating a stronger immune system at the cellular level. Gene expression analysis revealed that vitamin B6 activated genes responsible for amino acid metabolism and immune defense, showing the vitamin works at the molecular level to improve health
This research builds on previous studies showing vitamin B6 importance in fish and other animals by providing the first precise requirement for Pacific white shrimp fed soybean-based diets. The finding that 69 mg/kg is optimal aligns with general principles that vitamins are essential but excess amounts don’t provide additional benefits. The comprehensive gene expression analysis represents a more detailed understanding than previous work, showing exactly which biological pathways vitamin B6 activates
The study only tested shrimp fed soybean meal-based diets, so the vitamin B6 requirement might differ for shrimp eating other types of feed. The research was conducted in a controlled laboratory setting, which may not perfectly reflect conditions on commercial shrimp farms. The study didn’t test whether the optimal vitamin B6 level changes as shrimp grow larger or in different water conditions. Additionally, the exact sample size for each group wasn’t specified in the abstract, though the study design suggests adequate replication
The Bottom Line
Shrimp farmers should include approximately 69-75 milligrams of vitamin B6 per kilogram in soybean meal-based feeds to optimize growth and health (high confidence based on controlled experimental evidence). Adding more than this amount provides no additional benefit and wastes resources. This recommendation applies specifically to juvenile Pacific white shrimp fed soybean-based diets
Shrimp farmers and aquaculture feed manufacturers should use these findings to optimize their feed formulations. Seafood producers concerned with shrimp health and quality will benefit from this research. Consumers interested in sustainably and healthily farmed seafood benefit indirectly from improved farming practices. This research is less relevant to people who don’t work with shrimp farming
Shrimp farmers implementing this vitamin B6 level should see improved growth rates within 2-3 weeks and measurable immune system improvements within 4-6 weeks of feeding the optimized diet
Frequently Asked Questions
How much vitamin B6 do shrimp need in their food?
Pacific white shrimp need approximately 69 milligrams of vitamin B6 per kilogram of food to grow optimally. This amount was determined through a 2026 research study that tested various supplementation levels and found growth plateaued beyond 75 mg/kg.
Can shrimp make their own vitamin B6?
No, shrimp cannot produce enough vitamin B6 on their own. A 2026 study using antibiotic-treated diets showed shrimp fed diets without vitamin B6 supplementation had significantly lower liver vitamin levels, proving they require dietary sources.
What happens to shrimp when they don’t get enough vitamin B6?
Shrimp without adequate vitamin B6 grow more slowly, have weaker immune systems, digest food less efficiently, and show reduced antioxidant enzyme activity. Research shows these deficiencies increase vulnerability to infections and disease.
Does adding extra vitamin B6 beyond 69 mg/kg help shrimp grow faster?
No, research shows shrimp growth plateaus at around 75 mg/kg vitamin B6. Adding more vitamin beyond this amount provides no additional growth benefits and wastes resources without improving health outcomes.
How does vitamin B6 strengthen a shrimp’s immune system?
Vitamin B6 activates genes controlling immune defense and increases immune cell production in the liver. It also boosts antioxidant enzymes that protect cells from damage and increases lysozyme activity, which kills harmful bacteria.
Want to Apply This Research?
- If managing shrimp farms, track daily weight gain and feed conversion ratio (how much food converts to body weight) weekly, comparing before and after implementing the 69-75 mg/kg vitamin B6 level
- Aquaculture professionals should audit current feed formulations to verify vitamin B6 content and adjust supplier specifications or formulations to meet the 69 mg/kg requirement
- Establish baseline health metrics (disease incidence, survival rate, growth rate) before changing feed, then monitor the same metrics monthly for 3-6 months to document improvements from optimized vitamin B6 levels
This research applies specifically to Pacific white shrimp (Penaeus vannamei) fed soybean meal-based diets in controlled laboratory conditions. Vitamin B6 requirements may vary based on water conditions, shrimp age, feed composition, and farm-specific factors. Farmers should consult with aquaculture nutritionists before making feed changes. This information is for educational purposes and should not replace professional nutritional advice from feed manufacturers or aquaculture specialists. Individual shrimp health outcomes may vary based on multiple environmental and management factors beyond diet alone.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.