Dwarf Sucker Catfish (Otocinclus spp.) Import

The Otocinclus, often called the “Oto” or “Dwarf Sucker,” is a small, peaceful freshwater catfish prized for its algae-eating abilities and gentle nature. Native to South America, these social fish thrive in groups and are ideal for planted and community aquariums.

Physical Characteristics:

• Size: Typically grows to 4–5 cm (1.5–2 inches).
• Coloration: Features a sleek, elongated body with a light gray to brown base color and a distinct horizontal stripe running along the length of the body. Some species may display spotted or mottled patterns.
• Body Shape: Streamlined with a sucker mouth for adhering to surfaces.

Behavior and Compatibility:

• Temperament: Peaceful, social, and shy; thrives in groups of 6 or more.
• Tankmates: Ideal companions for small, non-aggressive fish such as tetras, rasboras, and shrimp. Avoid larger or aggressive species that may harass or eat them.
• Activity: Active during the day and often seen clinging to plants, glass, or decorations as they graze on algae.

Habitat Requirements:

• Tank Size: Minimum of 10 gallons, with larger tanks recommended for bigger groups.
• Water Parameters:
  • Temperature: 22°C–26°C (72°F–79°F).
  • pH: 6.0–7.5.
  • Hardness: Soft to moderately hard water (2–15 dGH).
• Substrate: Fine sand or smooth gravel to prevent injury to their sensitive undersides.
• Environment:
  • Dense planting with a variety of live plants to mimic their natural habitat.
  • Include driftwood and smooth rocks to provide grazing surfaces.
  • Gentle water flow to replicate slow-moving streams.

Diet:

• Primarily Herbivorous:
  • Consumes algae naturally present in the tank, including diatoms and biofilm.
  • Supplement diet with:
    • Algae wafers or spirulina-based pellets.
    • Blanched vegetables like zucchini, spinach, or cucumber.
• Feeding Tips: Monitor algae availability and provide supplements as needed, especially in well-maintained or new tanks.

Care Tips:

1. Keep Otos in groups for social enrichment and reduced stress.
2. Acclimate them slowly during introduction, as they are sensitive to sudden changes in water parameters.
3. Avoid placing them in tanks with strong currents or aggressive tankmates.

Breeding:

• Reproduction: Breeding in captivity is rare but possible in mature tanks with stable conditions.
• Setup: Provide dense vegetation and soft, acidic water to encourage spawning.
• Behavior: Females lay adhesive eggs on leaves or glass. Parents do not guard the eggs, so separate them if needed.
• Fry Care: Feed fry with powdered spirulina or specialized fry foods.

Benefits in the Aquarium:

• Algae Control: Highly efficient at keeping algae in check without damaging plants.
• Low Maintenance: Hardy and easy to care for in well-maintained tanks.
• Aesthetic Appeal: Their unique grazing behavior and peaceful demeanor make them a delight to observe.

The Otocinclus Catfish is a fantastic addition to any community or planted aquarium, offering both utility and charm. With proper care and a peaceful environment, Otos thrive and contribute to the overall health and cleanliness of your tank.