Venting an Oscar fish can be stressful and should be done with care.
- Remove the fish and place it in a clean bucket with enough aquarium water to cover its body. Add one tablespoon of aquarium salt per 5 gallons.
- Locate the small vent near the anus and gently insert a cotton swab to remove blockage.
- Return the fish to its tank and observe for signs of stress or illness.
If you cannot clear the blockage or the fish shows signs of distress, consult a veterinarian.