COWS: The contents of one vial (10 mL) of reconstituted CHORULON® should be administered as a single deep intramuscular injection. Dosage may be repeated in 14 days if the animal's behavior or rectal examination of the ovaries indicates the necessity for retreatment.
FINFISH: CHORULON® should be administered via intramuscular injection just ventral to the dorsal fin for one (1) to three (3) injections. Any single injection should be administered, depending on the fish species, at a dose of 50 to 510 I.U./lb body weight (bw) for males and 67 to 1816 I.U./lb bw for females. Depending on body weight and dose administered, it may be necessary to divide the dose among two or more injection sites to avoid injecting a large volume at a single site.
Summaries of doses tested in representative fish species are contained within the following tables. The dose of CHORULON® to be used in other species of finfish may differ from those species listed in the tables, but should fall within the suggested range of 50 to 510 I.U./lb bw for males and 67 to 1816 I.U./lb bw for females.
Table 1: Tested Fish Species/Dose Combinations Found to be Effective
NomenclatureCommon Name, Genus & Species, Family
Tested Dose(s)(I.U./lb bw/injection)
Number of Injections
Injection Interval (h)
yellow perch, Perca flavescens, Percidae
striped bass, Morone saxitilis, Percichthyidae
white bass, Morone chrysops, Percichthyidae
razorback sucker, Xyrauchen texanus, Catostomidae
walleye, Stizostedion vitreum, Percidae
red snapper, Lutjanus campechanus, Lutjanidae
sauger, Stizostedion canadense, Percidae
Chinese catfish, Clarius fuscus, Clariidae
Footnotes: 1, nt = not tested
Table 2: Tested Fish Species/Dose Combinations Found to be Safe
Nomenclature Common Name, Genus & Species, Family
Tested Dose(s) (I.U./lb bw/injection)
grass carp, Ctenopharyngodon idella, Cyprinidae
channel catfish, Ictalurus punctatus, Ictaluridae