The trout is described by researchers at Uppsala University as a genetically deviant "eco-type".
It is not a separate species yet, but one can call it a species in the making, says Leif Andersson, professor of genomics at Uppsala University, to the radio.
The predatory trout is approximately 30 centimeters long, compared to the ordinary trout which is 20 centimeters long. Another difference is that the ordinary trout eats plankton, while the predatory trout prefers other fish, primarily pike, of which there is a surplus.
If the predatory trout is left alone and not overfished, it can contribute to stabilizing the Baltic Sea's ecosystem, says Leif Andersson.
