Finquel (MS-222) is a highly versatile anesthetic/tranquilizer intended for the temporary immobilization of fish, amphibians and other aquatic cold blooded animals.   Finquel has long been recognized as a valuable handling tool during manual spawning (stripping), weighing, measuring, marking, sorting, transportation, photography and research.  Finquel is manufactured by Argent Laboratories as a white, water soluble powder.

Fish anesthetized with Finquel show rapid reversibility when placed in fresh water.   Further, the level of sedation is proportional to the strength of anesthetizing baths.  Finquel is not affected by salinity.