20 C.F.R. § 655.15
All registered employers that desire to hire H-2B workers must file an Application for Temporary Employment Certification with the NPC designated by the Administrator, OFLC. Except for employers that qualify for emergency procedures at § 655.17, employers that fail to register under the procedures in § 655.11 and/or that fail to submit a PWD obtained under § 655.10 will not be eligible to file an Application for Temporary Employment Certification and their applications will be returned without review.
(f) Separate applications. Except as otherwise permitted by this paragraph (f), only one Application for Temporary Employment Certification may be filed for worksite(s) within one area of intended employment for each job opportunity with an employer for each period of employment. Except where otherwise permitted under § 655.4, an association or other organization of employers is not permitted to file master applications on behalf of its employer-members under the H-2B program.
(2) An employer in the seafood industry may not bring H-2B nonimmigrants into the United States after the date that is 90 days after the start date for which the employer is seeking the services of the nonimmigrants unless the employer conducts new recruitment, that begins at least 45 days after, and ends before the 90th day after, the certified start date of need as follows:
(i) Completes a new assessment of the local labor market by—
(C) Offering the job to an equally or better qualified United States worker who—
(1) Applies for the job; and
(2) Will be available at the time and place of need.
(3) In order to comply with this provision, employers in the seafood industry must—
(1) Sign and date an attestation form stating the employer's compliance with this subparagraph. The attestation form is available at http://www.foreignlaborcert.doleta.gov/form.cfm;
(2) Provide each H-2B nonimmigrant worker seeking admission to the United States a copy of the signed and dated attestation, with instructions that the worker must present the documentation upon request to the Department of State's consular officers when they apply for a visa and/or the Department of Homeland Security's U.S Customs and Border Protection officers when seeking admission to the United States. Without this attestation, an H-2B nonimmigrant may be denied a visa or admission to the United States if seeking to enter at any time other than the start date stated in the petition. (The attestation is not necessary when filing an amended petition based on a worker who is being substituted in accordance with DHS regulations.) The attestation presented by an H-2B nonimmigrant worker must be the official attestation downloaded from OFLC's Web site and may not be altered or revised in any manner; and
(3) Retain the additional recruitment documentation, together with their prefiling recruitment documentation, for a period of 3 years from the date of certification, consistent with the document retention requirements under § 655.56. Seafood industry employers who conduct the required additional recruitment should not submit proof of the additional recruitment to the Office of Foreign Labor Certification.