Amazon Puffer (Freshwater) - Colomesus asellus
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The Amazon Puffer is a highly intelligent freshwater pufferfish known for its expressive behavior, bold personality, and distinctive spotted pattern. Unlike many puffers, this species is fully freshwater and becomes an engaging centerpiece fish when housed properly.
Common Names: Amazon Puffer, South American Puffer
Scientific Name: Colomesus asellus
Family: Tetraodontidae
Size: Up to 5 inches
Temperament: Aggressive
Difficulty: Moderate
Native Region: South America – Amazon and Orinoco River basins
Tank Size: Minimum 30 gallons (larger recommended for adults)
Temperature: 75–82°F
pH: 6.5–7.5
Hardness: Soft to moderately hard
Decor: Sand substrate, driftwood, smooth rocks, and plants; open areas for swimming with hiding spots
• Diet: Carnivorous – requires hard-shelled foods such as snails, clams, and crustaceans to prevent beak overgrowth
• Behavior: Extremely curious and interactive; may recognize its keeper
• Tankmates: Best kept alone; may nip fins or attack other fish
• Note: Strong filtration and excellent water quality are essential; avoid sharp décor due to sensitive skin