Please note: This is a Sole Source Notification. Specifications include, but are not limited to: 15,000 Biomark APT 12 pre-loaded pit tags. Biomark item# BIO 12.B04V2PLT; Pit tags will be used to gather vital data on The Deschutes River Stock hatchery spring Chinook program. This data is especially vital considering the extremely low adult returns encountered the last few years with Deschutes Stock spring Chinook. Data is used by ODFW to determine in stream adult return run estimates by year which guides us in making sound management decisions. This study is being conducted on hatchery spring Chinook smolts raised and released at Round Butte Hatchery. The study will evaluate the effectiveness of increasing the number of adult returns of hatchery spring Chinook to the Deschutes River. The Biomark APT-12 pit tags are the sole and commonly used pit tags for this purpose. They provide accurate and timely data to meet our needs. They are also the only pit tags that work in conjunction with our pit tag detection equipment at the hatchery (also manufactured by Biomark) as well as the instream pit tag detection equipment located on all the main stem Columbia River Dams. There are no other known options available which would allow us to accurately gather this vital data using our existing equipment.