Parasite-S (Formalin)

Parasite-S (formalin) is available in 55 gallon drums, 275 gallon totes and 4 x 1 gallon cases.

Contact us for pricing and assistance at 800-283-5292 or

Parasite-S (Formalin)


PARASITE-S (formalin) is an FDA approved parasiticide for the control of external Protozoa and Monogenetic Trematodes on all finfish, and external Protozoa on penaeid shrimp (FDA NADA # 140-989).  It is also approved as a fungicide for all finfish eggs.  New users are encouraged to seek advice from a fish health professional prior to using this product.  Refer to the “Directions for Use”, and MSDS links for details on directions for use prior to treating fish of any life stage, as well as limitations and cautions for all uses.  To maintain dosage rate or calculate effluent check out the Formaldehyde test Kits

PARASITE-S (formalin) is manufactured in FDA and Health Canada approved and inspected production facilities and is FDA approved for use on fish as noted above.  Parasite-S (formalin) is available in 1 gallon jugs, 55 gallon drums, and 275 gallon totes and is warehoused in both Western and Eastern locations to allow for cost effective shipping throughout North America.  The use of other grades of formaldehyde on fish may be in violation of FDA regulations as outlined in FDA Reminder to Aquaculture Producers Regarding Approved Formaldehyde

Resources for Usage

The American Fisheries Society - Fish Culture Section's Working Group on Aquaculture Drugs, Chemicals, and Biologics (WGADCB) has published a Guide to Using Drugs, Biologics and Other Chemicals in Aquaculture, as well as a Treatment Calculator to assist in the dosage calculations of certain products.

The Guide and Treatment Calculator can be found by clicking the link below

Guide to Using Drugs, Biologics and Other Chemicals in Aquaculture

*Treatment Calculator (Excel 97-2003)

*Treatment Calculator (Excel 2010)

*Although the calculator has been checked for accuracy and can be a useful tool to aid in calculating treatment dosagesthe end user is responsible for correctly applying any regulated compound in aquaculture.

COLD WEATHER NOTICE - Parasite-S is temperature sensitive and should not be allowed to reach temperatures below 40 degrees F. Regional weather conditions vary greatly and Syndel advises that all formalin users should to stock up on product prior to the cold weather season.  For more information, and to give us authorization to ship during questionable weather, please refer to our Cold Weather Authorization form.

For additional product and/or delivery information, please contact Syndel (800) 283-5292 or