Pantothenic acid (vitamin B5) is a component of coenzyme A (CoA), one of the most important molecules in metabolism. CoA is essential for breaking down fats, carbohydrates, and certain amino acids for energy, and for synthesizing fatty acids, cholesterol, steroid hormones, and the neurotransmitter acetylcholine. In fish, pantothenic acid is particularly important for maintaining the mucus coat and gill tissue — two of the most metabolically active surfaces in the body.
Pantothenic acid deficiency produces some of the most recognizable symptoms in freshwater fish. The classic sign is gill hyperplasia and clubbing — the gill filaments swell and fuse together, reducing the surface area available for oxygen exchange. Affected fish gasp at the surface or hover near filter outlets seeking oxygenated water. The mucus coat also deteriorates, leaving the skin rough and vulnerable to infection.
This vitamin gets its name from the Greek word 'pantos' meaning 'everywhere,' and true to its name, pantothenic acid is found in a wide range of foods. Deficiency is most likely in fish fed a very restricted or poor-quality diet for an extended period.
Provided by quality commercial fish food containing fish meal and yeast-based ingredients, which are naturally rich in pantothenic acid. A varied diet is the best insurance against deficiency. If fish show gill problems, check water quality first (ammonia, nitrite, pH), but consider nutritional factors if water parameters are normal and diet has been monotonous.
0.48% of daily nutrient intake
Vitamin B5 (Pantothenic Acid) makes up 0.48% of your freshwater fish's total daily nutritional requirements by weight. That's a tiny amount — but it matters.
Gill hyperplasia and clubbing (gill filaments swollen and fused, visible as thickened or pale gills), gasping at the water surface or near filter outlets, excessive mucus production followed by mucus coat breakdown, lethargy, loss of appetite, sluggish movement, and increased susceptibility to gill parasites and bacterial infections. Skin may appear rough or develop a whitish coating.
Pantothenic acid is water-soluble and no toxicity has been reported from dietary sources in fish. Excess is harmlessly excreted.
| Life Stage | Size | Min | Max | Unit | Notes |
|---|---|---|---|---|---|
| Adult | — | 10 | 50 | mg/kg diet | Critical for gill health. Deficiency causes characteristic gill hyperplasia and clubbing. Widely available in fish meal and yeast ingredients. |
Source: NRC 2011, general aquaculture consensus
