Product Description

Chorulon (chorionic gonadotropin) is a sterile and effective preparation of chorionic gonadotropin, which has been routinely used for nearly two decades to induce and synchronize the ovulation and spawning of various cultured fish species.

Chorulon provides the fish farmer with a tool to eliminate losses due to partial ovulation and spawning, as well as enhance egg quality, milt production, sperm volume and motility, and resulting fertilization rates. In comparison with the traditionally used crude fish pituitaries, Chorulon has several further significant advantages which have become increasingly important in today’s modern and intensive fish farming industry:

Chorulon is a hormonal spawning aid approved by the FDA in the USA for use in finfish (NADA 140-927). It is a freeze-dried preparation of human chorionic gonadotropin (hCG) for administration after reconstitution in the accompanying sterile diluent. It has luteinizing hormone (GtH-II)-like activity with little or no follicle stimulating hormone (GtH-I) or oestrogenic activity.

After reconstitution, Chorulon is administered via intramuscular injection just ventral to the dorsal fin for one to three 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.

No withdrawal period is required for cows or brood finfish treated according to label directions. The total dose administered (all injections combined) should not exceed 25,000 I.U. (25 mL) per fish in fish intended for human consumption. Chorionic is a protein. In the unlikely event of an anaphylactic reaction, epinephrine should be administered. The administration of an antihistamine may also be indicated.