I had to show you these pictures from my field trip with Katie Kobayashi at Scott Creek in Santa Cruz. Katie is studying O. mykiss life-history strategies. She compares the diet of young fish that had been born this year. They are referred to as YOYs (young of the year). To find out what they are eating she makes them throw up. This is called ‚gastric lavage‘. She gently massages their abdomen while inserting a tube and flushing their stomachs out with water. Then she tags them with PIT tags (Passive Integrated Transponder). PIT tags will allow her to track the fish and find out whether they stayed in their natal rivers or whether they left to migrate into the ocean. Katie is studying whether their diet plays a role in deciding to leave or stay.
I tagged along with Katie and sampled stomach and gut microbes. The trip was a great success. Thanks to the heavy rainfalls last winter many fish managed to spawn and produce a lot of offspring. These YOYs are the ones that we are interested in. They seem to be doing very well this summer!
Und ein Film zum Abschluss: