The Institute of Oceanography and Fisheries (IOF) is a scientific institution established for the investigation of the sea. The scientific activity conducted encompasses virtually all aspects concerned with sea exploration: physical, chemical, geological, biological and fisheries. In it’s seventy years of existence, the scientists at the IOF have published over 1700 scientific and professional papers in both domestic and foreign publications.The papers have included expedition reports, hydrographic studies, dynamic properties of the marine eco-system, description of flora and fauna, ecological research (in particular, primary and secondary production), fisheries research, advancements in fishing and artificial breeding (in relation to the Adriatic and Mediterranean, including coastal and open seas), as well as man’s impact on the sea.During oceanographic cruises, if the weather permits, in-situ optical measurements are performed by IOF in the Middle Adriatic Sea. In cooperation with Institute for Marine and Coastal Research from Dubrovnik some measurements were performed also in the South Adriatic Pit. Cooperation is established also with National Institute of Biology in Piran (Slovenia) and with University of Mostar (BiH).