Impacts of non-native fishes on Iberian freshwater ichthyofauna: current knowledge and gaps

Angling web forums as an additional tool for detection of new fish introductions: the first record ofPerca fluviatilisin continental Portugal

“…In the continental Portuguese freshwaters, eighteen non-native species are currently established, representing from 25% to 30% of the total fish community in several basins, mainly in the southern region (Ribeiro et al, 2009;Ilhéu, unpublished data). In Spain, twenty-six non-native fish species are currently established in freshwater ecosystems, representing at least 30% of the current freshwater fish fauna list (Elvira and Almodóvar, 2001;Leunda, 2010). The main routes or pathways for fish invasions in the Iberian Peninsula are well identified, being the entryway, the French border, with an invasion route from east to west, from Spain to Portugal.…”

“…In conclusion, anglers and environmental managers have conflicting interests. Non-native fish species recurrently introduced by anglers constitute a major concern and a great threat to native fauna through predation, competition, hybridization and transmission of new diseases to native fauna (see Leunda, 2010;EEA, 2012). For example, one of the most valued game fish species in Portugal, the non-native largemouth bass Micropterus salmoides, clearly affects the native fish community's structure (e.g.…”

Seasonal changes in fish assemblages in the River Minho tidal freshwater wetlands, NW of the Iberian Peninsula

“…Most of these species were recently introduced, and in the River Minho TFWs, three new NIS are described in this study when comparing with earlier data (Antunes, 1990;Antunes and Weber, 1990), namely C. carpio, and T. tinca, in addition to one specimen of L. gibbosus. The number of established non-indigenous fish species in IP ranges between 28 and 38 (Cobo et al, 2010;Leunda, 2010;Doadrio et al, 2011). Cobo et al (2010) found delays for introduction in Galicia (further NW region of IP) up to 100 years for species introduced in the IP at the beginning of the 20th century.…”

Depredación de lucio (Esox lucius L., 1758) sobre rata de agua (Arvicola sapidus Miller, 1908) en la Región de Murcia (SE España)

“…Numerosos trabajos han puesto de manifiesto el efecto de este carnívoro introducido sobre las poblaciones de rata de agua (Melero et al 2012, García-Díaz et al 2013, pero los estudios sobre el impacto de otros depredadores exóticos son muy escasos (Mate et al 2014). En las aguas continentales de la Península Ibérica, la introducción de peces alóctonos se ha incrementado notablemente durante las últimas décadas y muchas de estas especies muestran hábitos depredadores (Leunda 2010). En la Cuenca del Segura, casi el 60% de las especies que componen actualmente la comunidad de peces continentales no son nativas (Oliva-Paterna et al 2014 (Pena 1986).…”