Recreational fishermen

The release of fish species for sporting and recreational purposes is a very common phenomenon in Europe, especially in Italy, country in which it is very practiced, but where the controls have been completely absent or ineffective for a long time. The result is that the alien species of fishes are more numerous in Italy than in other European countries representing, according to some estimates made in the past, the fourth cause of threat for local fishing species. Nowadays their weight is probably even greater. According to several studies, the first place in the causes of introduction of additional alien species of fishes would be the accidental transportation.