The mussel - how it functions   How the blue mussel functions Here you can see how the blue mussel catches its food, i.e. small particles of food, from the surrounding water. This presentation is part of a 20-poängs examensarbete by Johan Cruse in Marine zoology at the University of Göteborg. It has been created in Director and transformed to a Shockwave Director application that is 3,7 MB in size and can take a few minutes to download. Film of a mussel bank This film shows a camera travelling over a mussel bank in the sound between Tjärnö and Saltö on the Swedish west coast.. Looking inside a blue mussel Follow the camera inside the mussel and look at the gills close up.