Invasive Species Compendium

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Abstract

Southernmost record of Gymnocephalus cernua (Linnaeus, 1758) in European lakes.

Abstract

We report the presence of the alien freshwater teleost Gymnocephalus cernua in the volcanic lake of Bracciano in central Italy. The contribution of local citizens was essential for this finding, particularly the interviews with local professional fishermen made it possible to report the presence of this species. To confirm this datum, some specimens were collected and identified at the species level by morphological characteristics. Biological parameters were collected (standard length, mass, sex, mass of gonads and of digestive tracts) from each specimen. From the observation of gonads, we confirm the presence of mature individuals in Lake Bracciano during autumn 2020. This report represents the southernmost data for this species in the European distribution range. For this reason, this population may be further studied to evaluate the adaptability and invasiveness potential of this species in southern habitats, particularly in volcanic lakes.