Best Biotin-Rich Foods for Freshwater Fishs

Ranked by biotin content among foods safe for freshwater fishs in the Creature Feast catalog.

Bloodworms per 100g freeze-dried: ~5µg biotin Bloodworms contain biotin (vitamin B7) that supports the carboxylase enzymes fish need for fatty acid synthesis and gluconeogenesis. Biotin also maintains the integrity of the mucus coat that protects fish skin — a critical first-line defense against pathogens in aquarium water.

Brine shrimp per 100g freeze-dried: ~3µg biotin Brine shrimp provide biotin from their whole-organism nutrition. The biotin content supports the metabolic enzymes that fish use to convert dietary protein and fat into energy and structural components.

Spirulina flakes per 100g: ~4µg biotin Spirulina flakes contain biotin as part of their complete B-vitamin profile. Regular spirulina feeding contributes to the background biotin intake that supports healthy skin, mucus production, and metabolic function in herbivorous and omnivorous fish.