North Sea International Bottom Trawl Survey (IBTS)

The ICES International Bottom Trawl Survey (IBTS) in the North Sea has been undertaken during January/February since about 1970. Part of this survey includes station observations of hydrochemical measurements which has resulted in a most comprehensive dataset of the North Sea.

Prior to 1993 the IBTS surveys were known as the International Young Fish survey (IYFS)