1931 - 1968 Centre for Environment, Fisheries & Aquaculture Science (Cefas) Cefas Historic Secchi Depth Measurements

Secchi depth measurements, collected for studying the effects of the light climate on pelagic fish (e.g. fish school position in the water column compared to the depth of penetration of light); The dataset comprise 470 Secchi depth measurements collected in 1931, 1937, 1946-1950, 1968.