This group of fish consists of sharks, skates, rays and ghost sharks. Cartilaginous fishes, as the name suggests, have skeletons made of cartilage rather than bone.
Unlike bony fish, they lack swimming bladders. Cartilage is lighter than bone and they can in addition control their buoyancy with their breast fins. Most species also have an oil-rich liver that can make up to 30% of their body mass and which contributes to buoyancy.
Sail ray - Rajella lintea
Sandy ray - Leucoraja circularis Shagreen ray - Leucoraja fullonica Spinetail ray - Bathyraja spinicauda Spotted ray - Raja montagui Starry ray - Amblyraja radiata Thornback ray - Raja clavata
We work on a number of different shark and skate species as well as the rabbit fish in Norwegian waters. Our research questions range from life history and stock development to distribution shifts, stock/population connectivity and movement and home ranges.
The main shark species we are currently working on are spurdog, porbeagle and basking shark.
The basking shark project is a collaborative project between several researchers in Norway and Scotland. Goal of the project is to get a better overview of the distribution and migration patterns in Norwegian waters. Therefore, we have launched an electronic reporting form for basking shark observations, and we hope that those who see a basking shark will report back when and where the observation took place (both observations of living basking sharks or findings of dead individuals). The online form for reporting a basking shark observation is found here: Havfunn portal
Additionally, we are collaborating with our institute colleagues in Bergen (Rupert Wienerroither, Otte Bjelland, Kjell Nedreaas, Tom Williams), Arve Lynghammar from the University of Tromsø and Nico Straube from the University of Bergen on questions related to skates and their species identification on fishing and research vessels.