Acta Ichthyologica et Piscatoria 21(S): 203-211, doi: 10.3750/AIP1991.21.S.21
Secchi depth-chlorophyll relationship in the Baltic
expand article infoH. Renk, J. Nakonieczny, S. Ochocki, Z. Lorenz, R. Majchrowski, D. Ficek
Open Access
The paper presents data on Secchi depth in the Southern Baltic waters. The mean annual Secchi depth is 8.2 m in the Gdańsk Deep, 9.6 m in the Bornholm Deep, 9.9 m in the southern Secchi depth is subject to seasonal fluctuations, their amplitude being approximately 35% of the mean annual value. A trigonometric polynomial was applied to describe periodic intra-annual changes of Secchi depth in the Baltic. The largest water transparency was observed in winter, the transparency being lowest in summer. Effects of chlorophyll a concentrations on water transparency are presented in a graphic form.