A new predatory species of herring has emerged in the Baltic Sea, based on research conducted ... Research showed that these fish-eating herrings have damaged gills, a result of struggling with ...

It colonized brakish and very recently fully formed Baltic sea (8 Ka BP ... but on small fish. Scientists have observed at least two separate populations of this species in the waters near ...

"There has been a sharp increase in these species in the Baltic Sea, and this is endangering the recovery of certain fish stocks that are important for coastal fisheries," explained the Swedish ...