![]() ![]() The affected fish would be easy targets for predators. In the video above, two winter-run Chinook at a UC Davis laboratory show symptoms of thiamine deficiency: one on its side at the bottom and another revolving in a corkscrew pattern. Each angler will get a card with a code number for their fish, which they can enter online to see the findings from their fish. That, in turn, can help determine how their diets have changed depending on when and where they are caught. In the laboratory, for example, the eyes of fish can reveal what they have been eating over the course of their lifetimes, while samples of muscle and the stomach contents can reveal what they have been eating in recent weeks, as well as in the last day. The heads, stomachs, and eggs of Chinook salmon that have been feeding in the ocean off the California Coast can help researchers understand what is causing the deficiency, and what might help remedy or mitigate its effects. Scientists are now teaming up with charter fishing boat operators in the summer of 2021 to collect certain parts of the salmon caught by the anglers aboard. However, it could affect endangered winter-run Chinook salmon and fall-run Chinook salmon, which comprise major California sport and commercial fisheries. The magnitude of its effect is not clear. This deficiency was recently found to be increasing mortality of juvenile Chinook salmon in California’s Central Valley. ![]() (Photo: Matt Blaney)Īnglers have unique opportunity to help scientists unravel a marine mystery that appears to be affecting native Chinook salmon through a deficiency of thiamine, or Vitamin B1, which is essential to all life. Fisheries biologist Rachel Johnson of NOAA Fisheries and UC Davis assists in sampling of salmon aboard the New Rayann to help investigate the influence of thiamine levels on the health of California Chinook populations. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |