The purpose of this bulletin is to apprise fishing vessel owners/operators of requirements that apply to the new construction, survey, and maintenance of certain commercial fishing vessels. In lieu of the commercial fishing vessel classing requirements in Title 46 United States Code (USC) §4503(a), certain vessels may meet alternative requirements as specified in 46 USC §4503(d).
https://www.dco.uscg.mil/Featured-Content/Mariners/Marine-Safety-Information-Bulletins-MSIB/