Pacific pink salmon (Oncorhynchus gorbuscha) were introduced in the Kola Peninsula for their valuable eggs in the 1950s. Since then, the species has spread along the entire Norwegian coast and will probably remain. This sudden increase in pink salmon numbers in Norway, thought to be linked to favourable climate conditions for pink salmon reproduction and survival, is expected to continue as water temperatures rise with climate change and large numbers of fish continue to arrive from Russia.