Visiting scientists in CRIMAC

Victor and Isabel have been guest researchers at CRIMAC this summer. They are both professors of Acoustics at the Polytechnic University of Valencia.

Author: Nils Olav Handegard

CRIMAC aims to determine the size of salmon from broadband echosounder measurements, and we have a series of measurements with six size groups ranging from 300 g to 3000 g. Salmon have an open swim bladder and that is refilled several times a day, which affects their acoustic properties. To achieve the objective, it is important to have a model to understand how these properties depend on size and how the swim bladder influences them.

Isabel has developed a model for echo strength from fish with swim bladders, and we wanted to use this in the work at CRIMAC. To do this, we also needed measurements of the parameters for the model. Victor brought measuring equipment from Spain, which were developed for tuna. We used this on salmon, which provided us with important measurements of the acoustic properties of salmon. We also conducted X-ray measurements on salmon of different sizes.

We are continuing to collaborate to analyse the data, and the goal is a joint publication on the work.

They brought their children and had a pleasant stay. We look forward to continuing the collaboration.