The National Institute of Aquatic Resources (DTU Aqua) is responsible for the Danish contribution to the International Bottom Trawl Survey (IBTS) and the Baltic International Trawl Survey (BITS), surveys conducted in the North and Baltic seas, respectively, with the objective of assessment of commercial fish stocks.
IBTS and BITS campaigns are conducted periodically onboard the R/V Dana, a versatile multi-purpose vessel managed by DTU Aqua. During the campaigns, deep-stratified demersal trawls for fish stocks are conducted at daytime and paired with other measurements (e.g., hydrographic, physico-chemical, biological) at night-time.
The database forms the basis for important data which is included in analyzes of fish stocks in the North and Baltic Seas.