John Fleng Steffensen, Professor
M.Sc., lic. scient (Ph.D.)

University of Copenhagen
Marine Biological Section, Department of Biology
Strandpromenaden 5, DK-3000 Helsingør


Telephone - direct : +45 353 21986    Cell Phone: +45 60770490
Telephone - reception: +45 353 21950  
e-mail primary :   
JFSteffensen @

e-mail secondary: JFSteffe @



ORCID: 0000-0002-4477-8039


Announcement: 5 week summer course - Fish Swimming - for graduate students University of Washington, Friday Harbor Laboratories, WA, USA - July 23.rd - August 23.rd 2019.


New Project: GUDP FitFish: Optimizing fish growth in aquaculture, based on fish physiological knowledge - oxygen consumption vs swimming speed and effects of hypoxia.


Main Project: Old And Cold: Biology of the Greenland shark


Nielsen, J., Hedeholm, R. B., Heinemeier, J., Bushnell, P. G., Christiansen, J. S., Olsen, J., Bronk Ramsey,C., Brill, R. W., Simon, M., Fleng Steffensen, K. and Fleng Steffensen, J. (2016). Eye lens radiocarbon reveals centuries of longevity in the Greenland shark (Somniosus microcephalus). Science, August 12 2016, Vol 353, 702-704.








High-speed video of sailfish slashing a sardine school - recorded at 240 frames pr. second - replayed in slow-motion at about 10 times lower speed.

Fishing with baited traps south of McMurdo Station in Antarctica on the ice at approximately 77,5 S - 165 E. The water was about 700 meters deep and the ice +2 meters thick. Foto: J. F. Steffensen.



Shark attacking baitfish at Heron Island, Great Barrier Reef, Australia. Photo:J. F. Steffensen.

Updated August