Parasite-s
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Questions & Answers
Side Effects & Adverse Reactions
WITHDRAWAL TIME
Zero days.
Warning
Striped bass have been demonstrated to be hypersensitive to formalin; lethal toxicity has been
noted to occur at levels approximately 2-3 times the recommended therapeutic concentration.
Legal Issues
There is currently no legal information available for this drug.
FDA Safety Alerts
There are currently no FDA safety alerts available for this drug.
Manufacturer Warnings
There is currently no manufacturer warning information available for this drug.
FDA Labeling Changes
There are currently no FDA labeling changes available for this drug.
Uses
1. Parasiticide for Finfish: for the control of external protozoa (Chilodonella spp., Ichthyobodo spp., Epistylis spp., Ichthyophthirius spp., Ambiphrya spp. and Trichodina spp.), and the monogenetic trematode parasites (Cleidodiscus spp., Dactylogyrus spp., and Gyrodactylus spp.).
2. Parasiticide for Penaeld Shrimp: for the control of external protozoan parasites (Bodo spp., Epistylis spp., and Zoothamnium spp.).
3. Fungicide for Finflsh Eggs: for the control of fungi of the family Saprolegniaceae.
History
There is currently no drug history available for this drug.
Other Information
Description
PARASITE-S is the aqueous solution of formaldehyde gas (this is equivalent to formalin 37% or
37grams of formaldehyde in 100mLof solution). U.S.P. grade PARASITE-S contains not less than
37% (by weight) of formaldehyde gas per weight of water and 6 to 14% methanol. In solution, formaldehyde
is present chiefly as HO(CH20)H. Its molecular weight is 30.93. PARASITE-S is readily
miscible with water, methanol, and ethanol and is slightly soluble in ether. It is a clear, colorless
liquid (Heyden Newport Chemical Corporation, 1961).
Fish and Shrimp Toxicity Studies
The toxicity of PARASITE-S was measured by standard methods in laboratory bioassays with
rainbow trout, Atlantic salmon, lake trout, black bullhead, channel catfish, green sunfish, bluegill,
smallmouth bass, largemouth bass and striped bass. The 3,6,24 and 96-hour LC50 (lethal
concentration for 50% of the animals) values for trout range from 1,230 to 100 μL/L (455 to 37 ppm
formaldehyde); for catfish, from 495 to 65.8 μL/L (183 to 24 ppm formaldehyde); for bluegill,
from 1,230 to 100 μL/L (455 to 37 ppm formaldehyde); for catfish, from 495 to 65.8 μL/L (183 to 24 ppm formaldehyde);
for bluegill, from 2,290 to 100 μL/L (847 to 37 ppm formaldehyde); for largemouth bass,
the values for 6 to 96-hour LC50 range from 1,030 to 143 μL/L (381 to 53 ppm formaldehyde) (Bill et al. 1977)
and for striped bass the values for 6 to 96-hour LC50 range from 940 to 30 μL/L (347 to 11 ppm formaldehyde)
(Bills, Marking and Howe-1993). The 24, 48, 72 and 96 hour LC50 values for penaeid shrimp range
from 712 to 250 µL/L (ppm) (Johnson. 1974 and Williams, 1980).
Sources
Parasite-s Manufacturers
-
Western Chemical Inc.
![Parasite-s (Formaldehyde) Liquid [Western Chemical Inc.]](/wp-content/themes/bootstrap/assets/img/loading2.gif)
Parasite-s | Western Chemical Inc.
APPLICATION TO TANKS AND RACEWAYS -Turn off water supply, provide aeration, apply
appropriate amount of PARASITE-S, and thoroughly dilute and mix to assure equal distribution of
PARASITE-S. Treat for up to 1 hour for fish and up to 4 hours for penaeid shrimp, then drain the
solution and refill the tank with fresh, well-aerated water. While tank is under treatment, adequate
oxygen must be present to maintain the fish or shrimp. If needed. aeration should be provided to
prevent oxygen depletion. Treatments may be repeated daily until parasite control is achieved.
APPLICATION TO PONDS - Apply greatly diluted PARASITE-S to the pond evenly using a pump,
sprayer, boat bailer, or other suitable device to assure even distribution. Allow PARASITE-S to dissipate
naturally. Single treatments usually control most parasites, but may be repeated in 5 to 10 days if
needed. Treatments for Ichthyophthirius should be made at 2-day intervals until control is achieved.
APPLICATION TO EGG INCUBATORS - Apply PARASITE-S into a constant water supply flowing
around the eggs. A drip or pressure system should be used and timed. Apply PARASITE-S under
the surface of the water flow.
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