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Gravato C., Guimarães L., Santos J., Faria M., Alves A. and Guilhermino L. (2010). Comparative study about the effects of pollution on glass and yellow eels (Anguilla anguilla) from the estuaries of Minho, Lima and Douro Rivers (NW Portugal). Ecotox. Environ. Safe. 73, 524-533.