Biomarine is the research group for marine biology and aquaculture. The marine biological activities comprise research fields such as ecology, physiology, bio-systematic, genetics of populations and dynamics in marine ecosystems. The Trondheim fjord system serves as a model for many marine biological studies. Aquaculture research aims at a better understanding and exploitation of marine biological resources. A significant part of the research is characterised by interdisciplinary research in the cross-over between marine biology, aquaculture and technological development. Research projects focus on juvenile aquaculture technology, larval nutrition, quality, and developmental biology of species like Atlantic cod, Atlantic halibut and Atlantic salmon, as well as blue mussels. A strategic focus is put on improved area resource management for aquaculture by integrated aquaculture and on exploitation of marine resources for fish feed such as zooplankton. Additionally the group addresses eco-toxicological problems in the sea.

Trondheim biological station (TBS) is the centre for marine biological research at NTNU, while aquaculture research activities are centred at Brattøra Research Centre. Research activities include laboratory studies as well as extensive field work. The research facilities offer good office and laboratory facilities, a research vessel, and are located on the shore of the Trondheimfjord.