Blog post
Blog Herring acoustic survey: Ornithologist Tim Sykes is counting seabirds
Follow the Blog of the researchers of IMARES, who are on the North Sea for an Herring acoustic survey.
Photo: Tim at work in the 'observer box' on top of the bridge of Tridens
Blog about the survey: http://herringsurvey.blogspot.nl/
More about the research: Herring Acoustic Survey