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A total of 105 ponds and lakes across the alpine area of Retezat National Park were surveyed in order to find if the introductions of nonnative fish species have a negative influence on the distribution and abundance of local amphibian populations. Surveys conducted over two summer months in 2006 were used to identify the lakes where the introduced fish species still occur and to note the status of amphibian populations. Experiments performed at two sites revealed that the fish species found infatcat:q6bblvc3sbakbozpv6ne4n2wbu