CWT Program Resources
Documents with information about the CWT Program and related information can be accessed from this document table.
| File | Description | File Date |
|---|---|---|
| 1984 Meeting Minutes – PMFC Ad-Hoc Committee for Documentation of CWT Studies | 1984 Meeting Minutes - PMFC Ad-Hoc Committee for Documentation of CWT Studies | 1984 |
| 1984 Publication – Coded-Wire Tag Replication Studies | The necessary groundwork has been completed to estimate the internal variability of CWT data via replication. A preliminary analysis was done on replicate releases from Abernathy. The analysis and results are discussed. | 1984 |
| Planning and Conducting Projects Using Coded Wire Tags (published by NMT) | Written by D. J. Solomon & G. E. Vander Haegen (Northwest Marine Technology, Inc). This document describes all aspects of the deployment of the Coded Wire Tag (CWT) and ancillary equipment. It is primarily aimed at new and potential users, but experienced users may also find it a useful reference if they are considering tagging new species or tagging under different conditions. This manual is not intended to replace the user manuals for each piece of equipment, but rather to complement them to help in the design and execution of overall tagging programs and the selection of the most appropriate equipment. It contains many hints and suggestions for tagging, tag recovery, tag reading, and data handling. Additional resources are available on the NMT website (www.nmt.us). | 2017 |
| Random-Sampling Design to Estimate Hatchery Contribution to Fisheries | American Fisheries Society Symposium 7:691-707, 1990 Author: Robert R. Vreeland The results from this case study illustrate some important points that may be relevant to a wide variety of mark-recapture experiments. The sampling effort required to produce reasonably precise parameter estimates was very high. However, the required precision of such estimates depends on the purpose of the study and the intended use of its results. If a lower level of precision is adequate, the required sampling effort can be reduced. [Note: document includes information on tag retention.] | 1990 |
| Regional Overview of Coded Wire Tagging of Anadromous Salmon and Steelhead in Northwest America (updated from 1989 version) | Author: J. Kenneth Johnson. Coded wire microtags (CWTs) were introduced in the Pacific Northwest in the late 1960s as an alternative to fin clipping and external tags for identification of anadromous salmonids in the region, particularly those of hatchery origin. Coastwide use of CWTs quickly followed, and fisheries agencies in Alaska, British Columbia, Washington, Oregon, and California established ocean sampling and recovery programs. Now, 54 federal, provincial, state, tribal, and private entities release over 50 million salmonids with CWTs yearly. Regional coordination of these tagging programs is provided by the Regional Mark Processing Center operated by the Pacific States Marine Fisheries Commission. The ‘Mark Center’ also maintains a centralized database for coastwide CWT releases and recoveries, as well as for associated catch and sample data. CWT data are provided to users via interactive on-line data retrieval. | 2004 |
| Overview of the Coded Wire Tag Program in the Greater Pacific Region of North America | Authors: George F. Nandor, , James R. Longwill, and , and Daniel L. Webb. The coded wire tag (CWT) was introduced in the greater Pacific region (Alaska, British Columbia, Washington, Idaho, Oregon, and California) in the late 1960s as an alternative to the fin clip and external tag for identification of anadromous salmonids – particularly hatchery origin fish. Coastwide use of the CWT quickly followed, and fisheries agencies in Alaska, British Columbia, Washington, Oregon, and California established ocean sampling and recovery programs. In 2009 47 Federal, Provincial, State, Tribal, and private entities released more than 50 million salmonids with the CWT yearly. Regional coordination of these tagging programs is provided by the Regional Mark Processing Center (RMPC) operated by the Pacific States Marine Fisheries Commission (PSMFC). The center also maintains a centralized database for coastwide CWT releases and recoveries, as well as for associated catch and sample data. CWT data are provided to users through an interactive on-line data retrieval system. An expert panel review of the CWT system in 2005 identified specific problems with the CWT system. In 2008, a CWT workgroup developed a response and an action plan to address those problems. | 2009 |