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Use of Tricaine Methane Sulfonate (MS-222)

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Tricaine Methane Sulfonate (MS-222) is commonly used as an anesthetic and euthanasia agent for fish and other aquatic species.

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MS-222 does not meet the OSHA classification as a toxic chemical but is considered an irritant to the eyes, respiratory system, and skin.

Type of Document



  • Safety and Health
  • Fish
  • Aquatic Species