Amano Shrimp
Also known as: Caridina multidentata
Amano Shrimp (Caridina multidentata) are highly effective algae-eating invertebrates native to Japan and Taiwan. The Amano Shrimp originates from Japan and Taiwan, found in freshwater streams and rivers with moderate to fast flow, often in areas with abundant vegetation and rocky substrates., reaches Adult size: 5 cm in captivity, typically lives 2-3 years, and is kept at 20-26°C (68-79°F). Individual fish vary, so treat this as a general guide rather than a guarantee.
Species at a glance
- Origin
- Japan and Taiwan, found in freshwater streams and rivers with moderate to fast flow, often in areas with abundant vegetation and rocky substrates.
- Adult size
- Adult size: 5 cm (2 inches)
- Life span
- 2-3 years
- Temperament
- Peaceful and non-aggressive; active scavengers that spend most of their time foraging for algae and detritus.
- Tank size
- Minimum 20 liters (5 gallons) for a small group; recommended 40 liters (10 gallons) or more for stable populations and natural behavior.
- Water temp
- 20-26°C (68-79°F)
- pH range
- 6.5-7.5
- Diet
- Primarily algae and biofilm; supplement with blanched vegetables (zucchini, spinach), algae wafers, and occasional protein sources like brine shrimp or daphnia.
- Other names
- Caridina multidentata
About the Amano Shrimp
Amano Shrimp (Caridina multidentata) are highly effective algae-eating invertebrates native to Japan and Taiwan. They are widely valued in planted aquariums for their relentless grazing on soft algae, biofilm, and detritus without harming plants. These shrimp are social and thrive in groups, exhibiting natural foraging behaviors when kept in adequate numbers. Their translucent bodies with distinctive lateral stripes make them both functional and visually appealing additions to community tanks.
Lifespan and health
Amano Shrimp typically live 2-3 years in captivity under optimal conditions, with some individuals reaching up to 4 years in exceptionally stable, well-maintained tanks. Lifespan is heavily influenced by water quality, diet variety, and stress levels—consistent parameters and minimal handling significantly extend longevity. Molting occurs every 4-6 weeks in healthy adults; during this vulnerable period, they seek shelter and should not be disturbed. Failed molts due to low calcium or poor water chemistry are a leading cause of premature death. Common health issues include bacterial infections (often signaled by opaque or milky appearance), fungal growth on the exoskeleton, and parasitic infestations like Vorticella (visible as white, fuzzy patches). These are usually secondary to poor water quality, overcrowding, or introduction of contaminated items. Ammonia or nitrite exposure causes lethargy, loss of appetite, and erratic swimming—test water weekly and act immediately if levels rise. Ensure adequate iodine and calcium in the water (via mineral supplements or calcium-rich foods like cuttlebone) to support proper exoskeleton formation during molting. Avoid sudden pH or temperature shifts, which can trigger fatal molting complications.
Overview
Amano Shrimp (Caridina multidentata) are highly effective algae-eating invertebrates native to Japan and Taiwan. They are widely valued in planted aquariums for their relentless grazing on soft algae, biofilm, and detritus without harming plants. These shrimp are social and thrive in groups, exhibiting natural foraging behaviors when kept in adequate numbers. Their translucent bodies with distinctive lateral stripes make them both functional and visually appealing additions to community tanks.
Care and tank setup
Amano Shrimp require a well-established aquarium with stable water parameters and ample surface area for biofilm growth. Use a fine sand or smooth gravel substrate to prevent injury to their delicate appendages, and provide plenty of hiding places via driftwood, rocks, and dense planting (e.g., Java moss, Anubias, or Hornwort). A gentle filter flow is ideal—avoid strong currents that can stress them, and ensure the tank is fully cycled before introduction, as they are sensitive to ammonia and nitrite spikes. Perform weekly 10-15% water changes using dechlorinated water matched to tank temperature, and maintain hardness between 4-8 dGH to support molting. Feed Amano Shrimp 2-3 times per week with a diet centered on natural algae and biofilm; supplement with blanched vegetables (offered for 2-4 hours then removed) and high-quality algae wafers. Avoid overfeeding, as excess food decomposes quickly and harms water quality. They are opportunistic scavengers and will consume uneaten fish food, dead plant matter, and microfauna, but rely primarily on biofilm for long-term health. Copper-based medications are lethal—never use them in tanks with invertebrates. Tankmates should be peaceful, small fish that do not prey on shrimp, such as Otocinclus catfish, small tetras (Neon, Ember), rasboras, or dwarf gouramis. Avoid larger or aggressive species like cichlids, bettas, or loaches that may hunt shrimp. Keep Amano Shrimp in groups of at least 5-10 individuals to reduce stress and encourage natural behavior; they are social and display more active foraging when in numbers. Never house with predatory invertebrates like assassin snails or large crayfish.
Related breeds
Breed information on this page is based on the Wikipedia article on the Amano Shrimp, supplemented with additional research. Reviewed for accuracy.