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Tricaine-S (Anesthetic)

Active Ingredients: TRICAINE-S is used for anesthesia or sedation of fish for tagging, weight sampling, spawning, transportation and surgery. The active ingredient is tricaine methane sulphonate (MS-222).

General Instructions

Immerse fish until desired depth of sedation or anesthesia is reached. The maximum exposure time is 30 minutes. Dosages vary according to species.  Maintain adequate oxygenation throughout the anesthesia and recovery. For periods of long anesthesia, neutralize the pH of the TRICAINE-S solution (acidic) to the pH of the holding tank with sodium bicarbonate. Treated fish must not be slaughtered for use in food for at least 5 days after the latest treatment with TRICAINE-S at water temperatures of 10°C or greater.

Dosage Information

  • Anesthesia: 100-250ppm for warm water fishes.
  • Sedation: 10-30ppm.


  • Use plastic or glass containers for TRICAINE-S solutions.
  • Maintain adequate oxygenation and acidity of solutions.
  • Use at water temperatures of 10°C or greater.