Sulfamerazine.

(a) Specifications. Type A medicated articles containing 99 percent sulfamerazine. (b) Sponsor. See No. 054771 in § 510.600(c) of this chapter. (c) Related tolerances. See § 556.660 of this chapter. (d) Special considerations. (1) Federal law restricts medicated feed containing this veterinary feed directive (VFD) drug to use by or on the order of a licensed veterinarian. See § 558.6 for additional requirements. (2) The expiration date of VFDs for sulfamerazine medicated feeds must not exceed 6 months from the date of issuance. VFDs for sulfamerazine shall not be refilled. (e) Conditions of use. It is used in fish feed for as follows: Sulfamerazine grams/ton Combination in grams/ton Indications for use Limitations Sponsor (1) To deliver 10 grams of sulfamerazine per 100 pounds of fish per day Rainbow trout, brook trout, and brown trout: For control of furunculosis Formulate to deliver 10 grams of sulfamerazine per 100 pounds of fish per day. Treat for not more than 14 days. Do not treat within 3 weeks of marketing or stocking in stream open to fishing 054771 (2) [Reserved] [81 FR 95013, Dec. 27, 2016]