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![An agar diffusion disc used in serological studies fish6017.jpg An agar diffusion disc used in serological studies](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_fish6017.jpg?itok=SHfCI8R_)
Description
An agar diffusion disc used in serological studies. The lines formed around the container in the center are used in determining the differences in races ofsalmon. This shows the reaction specific anti-sera in samples from severalareas. (Image credit: NOAA Central Library Historical Fisheries Collection)