The presence of the allochthonous species, asp, Aspius aspius (Linnaeus, 1758) and white bream, Abramis bjoerkna (Linnaeus, 1758) is to be mentioned for the first time in the freshwater canals of province of Ferrara, Northern Italy. The hydraulic system of artificial canals (4000 km) in the province of Ferrara (2630 Km2) is divided in more sub-basins, all related to the Burana-Volano canal that crosses the overall territory from west to east and is used for both irrigation and drainage. Particularly, the main sub-basins, named Canale Burana, Po di Volano, Po Morto di Primaro, Canal Bianco, Canale Navigabile, Canale Circondariale, were considered in this study. The classification to the species level was supported by the morpho-meristic parameters, in agreement with the range of variability described for the two species. Moreover, biometrical data of some white breams are in disagreement with the standards, probably indicating the presence of hybrids between Blicca bjoerkna and Abramis brama.
Prima segnalazione di aspio, Aspius aspius (Linnaeus, 1758) e blicca, Abramis bjoerkna (Linnaeus, 1758), Osteichthyes, Cypriniformes, nelle acque interne della provincia di Ferrara
CASTALDELLI, Giuseppe;ROSSI, Remigio
2003
Abstract
The presence of the allochthonous species, asp, Aspius aspius (Linnaeus, 1758) and white bream, Abramis bjoerkna (Linnaeus, 1758) is to be mentioned for the first time in the freshwater canals of province of Ferrara, Northern Italy. The hydraulic system of artificial canals (4000 km) in the province of Ferrara (2630 Km2) is divided in more sub-basins, all related to the Burana-Volano canal that crosses the overall territory from west to east and is used for both irrigation and drainage. Particularly, the main sub-basins, named Canale Burana, Po di Volano, Po Morto di Primaro, Canal Bianco, Canale Navigabile, Canale Circondariale, were considered in this study. The classification to the species level was supported by the morpho-meristic parameters, in agreement with the range of variability described for the two species. Moreover, biometrical data of some white breams are in disagreement with the standards, probably indicating the presence of hybrids between Blicca bjoerkna and Abramis brama.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
