The U.S. Fish and Wildlife Service (FWS) intends to award a sole source purchase order to Biomark LLC for the acquisition of specialized equipment, including Biomark APT 12 Pre-Load Trays and various submersible antennas, essential for fish population monitoring at the Klamath Falls National Fish Hatchery. This procurement is critical for the effective monitoring and support of endangered sucker species, as Biomark is the only vendor capable of providing the necessary equipment that is compatible with existing systems and has been extensively used by habitat partners. Interested parties may express their capability to respond to this requirement within three calendar days of this notice, which will close on August 6, 2025, at 5:00 PM Central Time; inquiries should be directed to Jack Skogen at jack_skogen@fws.gov.