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Posted Wed Apr 13 2011: from Basque Research:
In recent decades, the number of alien species in Navarre has tripled
In concrete, the experts involved are focusing on endemic freshwater species - euryhalines and diadromes - fish that can live in both fresh and salty water (such as salmon and eels).... In this sense, it is striving to increase awareness of and interest in autochthonous fish species under threat due to a number of factors. Amongst the most serious, points out Mr Miranda, is the alteration of the habitat caused by hydraulic works, water extraction, industrial waste dumping, the extraction of sand or the canalisation of riverbeds. "Moreover, particularly serious is the introduction of alien species, which causes the greatest impact", he stressed. According to the expert, invasive fish fed into our lakes and rivers put the survival of autochthonous Iberian Ichthyofauna in danger: "In fact, biological invasions are the second great cause of loss of biodiversity in the world, being especially damaging to freshwater systems". This is the case of predatory species such as black bass, pike or catfish, all of which are present in rivers in Navarre.... "This is the case of bleak (alburon) - possibly introduced as bait from France - and which in 20 years has become the dominant species over all the middle-range and lower stretches of the Ebro river basin and which, on competing with the nose fish (madrilla), has made the latter's numbers plummet throughout the zone".
[Read more stories about: invasive species, unintended consequences]

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