The nutrition available for fish in the northern Baltic Sea
has become lighter during the past 30 years.
”The amount of energy available for planktivorous organisms
has declined after the late 1970s, as both the food quality of phytoplankton
and the mean size of zooplankton have decreased”, says senior researcher Sanna
Suikkanen from Marine Research Centre at the Finnish Environment Institute.
”The observed change is probably due to complex interactions
between climate warming, eutrophication and overfishing.”