50 CFR §23.20

1. (a)Purpose. Articles III, IV, and V of the Treaty give the types of standard CITES documents that must accompany an Appendix-I, -II, or -III specimen in international trade. Articles VII and XIV recognize some exemptions and provide that a CITES document must accompany most exempt specimens.
2. (b)Stricter national measures. Before importing, introducing from the sea, exporting, or re-exporting a specimen, check with the Management Authorities of all countries concerned to obtain any documentation required under stricter national measures.
3. (c)CITES documents. Except as provided in the regulations in this part, you must have a valid CITES document to engage in international trade in any CITES specimen.
4. (d)CITES exemption documents. The following table lists the CITES exemption document that you must obtain before conducting a proposed activity with an exempt specimen (other than specimens exempted under § 23.92). If one of the exemptions does not apply to the specimen, you must obtain a CITES document as provided in paragraph (e) of this section. The first column in the following table alphabetically lists the type of specimen or activity that may qualify for a CITES exemption document. The last column indicates the section of this part that contains information on the application procedures, provisions, criteria, and conditions specific to each CITES exemption document, as follows:
5. (e)Import permits, export permits, re-export certificates, and certificates of origin. Unless one of the exemptions under paragraph (d) of this section or § 23.92 applies, you must obtain the following CITES documents before conducting the proposed activity:
6. (f)Introduction-from-the-sea certificates. For introduction from the sea of Appendix-I or Appendix-II specimens, you must obtain an introduction-from-the-sea certificate before conducting the proposed activity, unless the exemption in paragraph (d)(10) of this section applies (see § 23.39). The export of a specimen that was previously introduced from the sea will be treated as an export (see § 23.36 for export, § 23.36(e) and § 23.39(e) for export of exempt specimens, or § 23.37 for re-export). Although an Appendix-III specimen does not require a CITES document to be introduced from the sea, the subsequent international trade of the specimen would be considered an export. For export of an Appendix-III specimen that was introduced from the sea you must obtain an export permit (§ 23.36) if the export is from the country that listed the species in Appendix III, a certificate of origin (§ 23.38) if the export is from a country other than the listing country, or a re-export certificate for all re-exports (§ 23.37).