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Open AccessArticle

Assessment of Biological and Sanitary Condition of Alien Fish from a High-Mountain Lake (Cottian Alps)

1
Department of Life Sciences, University of Trieste, via Giorgieri 10, 34127 Trieste, Italy
2
The Veterinary Medical Research Institute for Piemonte, Liguria and Valle d’Aosta, Via Bologna 148, 10154 Torino, Italy
3
Department of Veterinary Medicine, University of Sassari, via Vienna 2, 07100 Sassari, Italy
*
Author to whom correspondence should be addressed.
Water 2020, 12(2), 559; https://doi.org/10.3390/w12020559
Received: 8 January 2020 / Revised: 10 February 2020 / Accepted: 14 February 2020 / Published: 18 February 2020
(This article belongs to the Special Issue Advances in Mountain and Mediterranean Wetlands Conservation)
This study aimed to assess the biological and sanitary conditions of alien fish in a high-mountain lake (Balma Lake) located in the Cottian Alps. A single fish sampling session (August 2018) using gillnets collected 90 specimens of brook trout (Salvelinus fontinalis). Sex and age were determined (59 females and 31 males, age class 0+ to 4+). Regression analysis showed no difference in total weight and total length between males and females (ANCOVA: F = 0.453; p = 0.954). The mean condition factor (Kmean) decreased with increasing age for males and females. Terrestrial insects were the main prey found in the fish stomachs. The parasitological exam was negative, and the bacteriological exam was positive for Carnobacterium maltaromaticum and C. divergens in 33% of specimens. The total mercury, cadmium, and lead concentration in muscle tissue was within the maximum limit established by the European Commission for human consumption. The brook trout population was found to be well structured; these findings may help local administrations in the implementation of eradication measures. View Full-Text
Keywords: non-native species; Alpine lakes; Alps; brook trout; Carnobacterium spp.; heavy metals non-native species; Alpine lakes; Alps; brook trout; Carnobacterium spp.; heavy metals
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Pastorino, P.; Prearo, M.; Bertoli, M.; Menconi, V.; Esposito, G.; Righetti, M.; Mugetti, D.; Pederiva, S.; Abete, M.C.; Pizzul, E. Assessment of Biological and Sanitary Condition of Alien Fish from a High-Mountain Lake (Cottian Alps). Water 2020, 12, 559.

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