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Analysis of chemicals in Amazonian fish ear-stones may help conservation efforts

from Science Daily

Fish species that are both economically and ecologically important in South America live mysterious lives. Scientists know relatively little about the thousands of fish species living in the world's largest river system — from the primitive, boney-tongued Arapaima that is the largest fish in the Amazon, to giant catfishes that undertake some of the longest migrations of any freshwater fishes in the world. Many of these species are rare, endangered, or threatened. more

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