Asp in Småland called VIPER, belongs to the family of carp fish. Aspen has an elongated body with a deep cleft tail. The fins are reddish-gray to reddish brown. Pectoral fins are long, slightly pointed and it is easiest to recognize aspen on when in the water. The mouth has a clear under bite and missing teeth.
Aspen can be very large plant, the largest specimens are over 1 meter in length and can weigh over 12 kg.
Aspen migrate up rivers to spawn in April-May. The game starts when the water temperature exceeds 6 ° C. The game takes place on flowing and cascading places with rocky bottom, often richly wooded with water moss.
Angling record is 8.0 kg.