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The rainbow trout(Oncorhynchus mykiss) is a species of salmonid native to tributares of the Pacific Ocean in Asia and North America as well as much of the central,western,eastern and specially the northern portions of the USA.The species has been introduced for food or sport to least 45 countries and very continent expect Antartica.In some locations such as Southern Europe,Australia and South America they have negatively impactedupland native fish species,either bu eating them,outcompeting them,transmitting contagious diseases or hybridization with closely-related species and subspecies that native to western North America.