Tagging of spiny dogfish
Norwegian fjords are becoming more hypoxic, which means that there is less oxygen available in the fjords. This can potentially affect bottom-dwelling animals, such as spiny dogfish, by driving them away from the bottom habitat to exploit other layers of the water column or other areas of the fjords. The LOST project therefore focuses on how especially oxygen affects the vertical migration of spiny dogfish. We began tagging spiny dogfish in October 2022 for the LOST project, and we have since then tagged a total of 80 individuals with acoustic transmitters that send information about their depth use, temperature, and activity in the fjords outside of Bergen. These dogfish will provide us with a lot of data on their behaviour and movement throughout the fjord system around Bergen, and the BTN team is very excited to follow them for several years.