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Hatchery fish mass-marking. On a hatchery fish, the adipose fin is removed, while a wild fish has an intact adipose fin. Since the 1970s, federal agencies have worked closely with states and treaty tribes in the Pacific Northwest to reverse the decline of native salmon populations.
Mass marking of hatchery fish is a tool that can be used to help monitor and reduce undesirable genetic effects on salmon populations, enabling improved broodstock management and by selectively harvesting hatchery fish to reduce the numbers of
May 3, 2012 · Mass marking helps us determine whether a fish was raised in a hatchery or is a wild fish. Mass marking is done by clipping the adipose fin from each hatchery fish by hand with scissors. A percentage of the fish are also tagged with a coded-wire tag.
Oct 6, 2023 · Mass-marking helps hatchery workers meet those goals by making hatchery fish readily identifiable. For example, visual identification makes it possible for salmon managers to determine the number of hatchery fish on the spawning grounds and take corrective action to reduce the impact to wild stocks.
Jun 19, 2015 · We then discuss hatchery operations and techniques, the use of conservation hatcheries, fish health and disease issues, biosecurity, the genetic integrity of stocks, interactions between hatchery and wild fish, and risk assessment.
- Jesse T. Trushenski, H. Lee Blankenship, James D. Bowker, Thomas A. Flagg, Jay A. Hesse, Kenneth M. ...
- 12
- 2015
- 19 June 2015
The Hatchery Marking and Tagging Program conducts the suite of activities related to mandated mass marking of hatchery fish including marking and tagging of juvenile fish, bio sampling of returning adult fish, providing assistance with recording and summarizing data, and associated reporting.
People also ask
What is a fish hatchery?
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May 26, 2022 · National fish hatcheries can help by raising aquatic wildlife that are at-at risk, threatened or endangered, improving recreational fishing, and supporting fisheries that have been impacted by a federal dam.
