Italian Bleak

description

Literature Kosorić & Vuković 1966 a; Čanković 1967; Čanković et al. 1968 a; Ivanović 1968; Vuković & Ivanović 1971; Kosorić et al. 1989; Mrakovčić et al. 1995; Škrijelj 2002; Bogut et al. 2006; Šanda et al. 2008 a, 2008 b; Buj et al. 2010; Perea et al. 2010; Žujo-Zekić 2021; Žujo-Zekić et al. 2018, 2020.

Freshwater fishes (Petromyzonti, Elasmobranchii, and Actinopteri) of Bosnia and Herzegovina: an updated inventory on the biodiversity and distribution

discussion

Remarks According to the literature (Kosorić & Vuković 1966 a; Kosorić et al. 1989; Mrakovčić et al. 1995; Škrijelj 2002; Bogut et al. 2006), this species was reported in the middle and lower section of the Neretva River downstream to its mouth, and in the Tihaljina / Trebižat River catchment and Buna River in BiH. However, the population from the Neretva River catchment is now recognized as a different species, Alburnus neretvae (Buj et al., 2010). Recent literature (Žujo-Zekić 2021; Žujo-Zekić et al. 2018, 2020) mentioned the presence of A. arborella in the Buško Lake, however, without providing diagnostic characters. Alburnus arborella is distributed in rivers which drain into the northern part of the Adriatic Sea from the Chienti drainage basin in Marche to Ancona Province (Slovenia, Switzerland, Italy) and the Tyrrhenian basin in the Arno drainage (Italy) (Kottelat & Freyhof 2007). The distribution and taxonomic status of the populations of Alburnus in the Adriatic Basin have not been fully resolved and require additional research (Geiger et al. 2014), and A. arborella is therefore not included in the checklist of BiH.

Freshwater fishes (Petromyzonti, Elasmobranchii, and Actinopteri) of Bosnia and Herzegovina: an updated inventory on the biodiversity and distribution

discussion

A second unusual observation in Alburnus requires reporting here: we noticed a previously undocumented phenotypic and ecological polymorphism of Alburnus alburnus in Lake Brienz. In this lake, we observed considerable variation in shape: on one hand fish with very long snouts, and on the other hand, blunt-snouted fish that resemble Alburnus alburnus from other lakes (Figure 39). The long-snouted type was commonly caught near the surface whereas the blunt-snouted type could be caught near the surface or in considerable depths down to 20 m.

Diversity, distribution and community composition of fish in perialpine lakes – “ Projet Lac ” synthesis report

discussion

has unfortunately become very rare in Lake Lugano. Only two individuals were caught in Projet Lac (Figure 38). One was a large (115 mm TL) individual of typical appearance with the high count of lateral line scales that Buj et al. [146] describe for A. maxima. The second was of very different appearance, and could not be assigned to A. arborella, A. maxima or A. alburnus. The COI gene (barcode) was sequenced for both fish. They were separated by several mutations, falling into two distinct subclades within samples currently considered A. arborella. The identity and diversity of Alburnus from Lake Lugano should urgently be investigated. Our unquantified impression is that the phenotype that corresponds to A. maxima is shared with Lake Maggiore whereas the other kind seems to resemble Alburnus from Lake Garda.

Diversity, distribution and community composition of fish in perialpine lakes – “ Projet Lac ” synthesis report