Tab. 1. Candidate metrics, expected responses to disturbance and results of criteria tests (1, 2 and 3) to compose the IBI PNP. The sign (-) indicates that the measure did not pass the test.MetricsResponse to disturbanceTest 1 - Range testTest 2 - ResponsivenessTest 3 - RedundancyRichness and species composition (8 metrics)1. Total number of native species (S)DecreasePassed the test--2. Total number of native fish orders (Ord)Decrease---3. Total number of native fish family (Fam)DecreasePassed the testPassed the testPassed the test4. Total number of rare fish species (Rar)DecreasePassed the test--5. Total number of Characiformes species (SCh)DecreasePassed the test--6. Total number of Siluriformes species (SSi)DecreasePassed the testPassed the testPassed the test7. Total number of Gymnotiformes species (SGy)DecreasePassed the test--8. Total number of Cichlidae species (SCi)DecreasePassed the testPassed the testPassed the testAbundance (8 metrics)9. Total number of individuals (N)DecreasePassed the testPassed the testPassed the test10. Number of species comprising 80% of abundance (N80)DecreasePassed the testPassed the testPassed the test11. Percent abundance of Characiformes (NCh)DecreasePassed the testPassed the testPassed the test12. Percent abundance of Siluriformes (NSi)DecreasePassed the testPassed the test-13. Percent abundance of Gymnotiformes (NGy)DecreasePassed the testPassed the testPassed the test14. Percent abundance of Cichlidae (NCi)DecreasePassed the test--15. Percent abundance of individuals larger than 30 cm (L30)DecreasePassed the test--16. Percent abundance of large migratory fish species (Mig)DecreasePassed the test--Feeding groups (10 metrics)17. Number of carnivorous species (SCar)DecreasePassed the test--18. Percent abundance of carnivores (NCar)DecreasePassed the test--19. Number of omnivorous species (SOni)IncreasePassed the test--20. Percent abundance of omnivores (NOni)IncreasePassed the test--21. Number of detritivorous species (SDet)DecreasePassed the test--22. Percent abundance of scavengers (NDet)DecreasePassed the test--23. Number of insectivorous/invertivorous species (SIns)DecreasePassed the test--24. Percent abundance of insectivores/invertivores (NIns)DecreasePassed the test--25. Number of herbivorous species (SHer)DecreasePassed the testPassed the testPassed the test26. Percent abundance of herbivores (NHer)DecreasePassed the test--Assemblage indicators and environmental health (8 metrics)27. Shannon diversity índex (H´)DecreasePassed the test--28. Pielou´s evenness index (J)DecreasePassed the testPassed the testPassed the test29. Percent abundance of Abramites hypselonotus (A.hyp)DecreasePassed the test--30. Percent abundance of the genus Eigenmannia (Eig)DecreasePassed the test--31. Percent abundance of the genera Pygocentrus and SerrasalmusIncreasePassed the test--32. Total number of introduced species (aliens/exotic/aloctonous) (SInt)Increase---33. Total number of hybrid species (NHib)Increase---34. Percent abundance of fish with anomalies (damage/deformation) (NAno)Increase---