Best Protein-Rich Foods for Freshwater Fishs

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

Bloodworms per 100g freeze-dried: ~55g crude protein Bloodworms are one of the richest protein sources available for freshwater aquarium fish. Their soft-bodied structure makes them highly digestible, and the amino acid profile closely matches what insectivorous and omnivorous fish encounter in the wild. Freeze-dried bloodworms retain most of their protein content and are eagerly accepted by nearly every community species.

Brine shrimp per 100g freeze-dried: ~50g crude protein Brine shrimp are a staple protein source in freshwater fishkeeping, providing a complete amino acid profile in a tiny crustacean package. Their exoskeleton adds a small amount of chitin that aids digestion, and newly hatched brine shrimp nauplii are one of the few foods small enough for fry of most species.

Mysis shrimp per 100g frozen: ~45g crude protein Mysis shrimp deliver an excellent protein punch with a superior amino acid balance compared to brine shrimp. Their larger size makes them ideal for medium-bodied community fish like angelfish, rainbowfish, and larger tetras. The higher fat content also supports coloration and breeding condition.

Daphnia per 100g freeze-dried: ~48g crude protein Daphnia are small freshwater crustaceans packed with protein that also serve as a natural laxative for fish, helping prevent the constipation and bloat issues common in species like bettas and fancy goldfish. Their jerky swimming motion triggers strong feeding responses even in reluctant eaters.

Spirulina flakes per 100g: ~60g crude protein (highly bioavailable) Spirulina flakes provide a plant-based protein source that is particularly valuable for herbivorous and omnivorous fish like mollies, platies, and bristlenose plecos. The protein in spirulina is highly digestible and contains all essential amino acids, making it one of the best non-animal protein vehicles for aquarium fish.