Abdel-Moneim, AM, Al-Kahtani, MA and Elmenshawy, OM (2012) Histopathological biomarkers in gills and liver of Oreochromis niloticus from polluted wetland environments, Saudi Arabia. Chemosphere 88(8), 1028–1035.
Agamy, E (2013) Sub chronic exposure to crude oil, dispersed oil and dispersant induces histopathological alterations in the gills of the juvenile rabbit fish (Siganus canaliculatus). Ecotoxicol Environ Saf 92, 180–190.
Ameur, WB, De Lapuente, J, El Megdiche, Y, Barhoumi, B, Trabelsi, S, Camps, L, Serret, J, Ramos-Lopez, D, Gonzalez-Linares, J, Driss, MR and Borras, M (2012) Oxidative stress, genotoxicity and histopathology biomarker responses in mullet (Mugil cephalus) and sea bass (Dicentrarchus labrax) liver from Bizerte Lagoon (Tunisia). Mar Pollut Bull 64(2), 241–251.
Au, DW (2004) The application of histo-cytopathological biomarkers in marine pollution monitoring: A review. Mar Pollut Bull 48(9–10), 817–834.
Barbieri, E, Campos-Garcia, J, Martinez, DS, Da Silva, JR, Alves, OL and Rezende, KF (2016) Histopathological effects on gills of Nile Tilapia (Oreochromis niloticus, Linnaeus, 1758) exposed to Pb and carbon nanotubes. Microsc Microanal 22(6), 1162–1169.
Barisic, J, Dragun, Z, Ramani, S, Filipovic Marijic, V, Krasnici, N, Coz-Rakovac, R, Kostov, V, Rebok, K and Jordanova, M (2015) Evaluation of histopathological alterations in the gills of Vardar chub (Squalius vardarensis Karaman) as an indicator of river pollution. Ecotoxicol Environ Saf 118, 158–166.
Bernet, D, Schmidt, H, Meier, W, Burkhardt-Holm, P and Wahli, T (1999) Histopathology in fish: Proposal for a protocol to assess aquatic pollution. J Fish Dis 22(1), 25–34.
Bordalo, AA, Teixeira, R and Wiebe, WJ (2006) A water quality index applied to an international shared river basin: The case of the Douro river. Environ Manage 38, 910–920.
Colin, N, Porte, C, Fernandes, D, Barata, C, Padros, F, Carrasson, M, Monroy, M, Cano-Rocabayera, O, De Sostoa, A, Pina, B and Maceda-Veiga, A (2016) Ecological relevance of biomarkers in monitoring studies of macro-invertebrates and fish in Mediterranean rivers. Sci Total Environ 540, 307–323.
Dane, H and Sisman, T (2015) Histopathological changes in gill and liver of Capoeta capoeta living in the Karasu River, Erzurum. Environ Toxicol 30(8), 904–917.
European Union. (2000) Directive 2000/60/EC of the European Parliament and of the Council of 23 October 2000 establishing a framework for Community action in the field of water policy. Off J Eur Union L327, 1–73.
Evans, DH (1987) The fish gill: Site of action and model for toxic effects of environmental pollutants. Environ Health Perspect 71, 47–58.
Evans, DH, Piermarini, PM and Choe, KP (2005) The multifunctional fish gill: Dominant site of gas exchange, osmoregulation, acid-base regulation, and excretion of nitrogenous waste. Physiol Rev 85(1), 97–177.
Fernandes, C, Fontainhas-Fernandes, A, Monteiro, SM and Salgado, MA (2007) Histopathological gill changes in wild leaping grey mullet (Liza saliens) from the Esmoriz-Paramos coastal lagoon, Portugal. Environ Toxicol 22(4), 443–448.
INAG (2009) Critérios para a Classificação do Estado das Massas de Água Superficiais – Rios e Albufeiras. Ministério do Ambiente, do Ordenamento do Território e do Desenvolvimento Regional. Instituto da Água, I. P. 29 pp.
Malaj, E, Von Der Ohe, PC, Grote, M, Kuhne, R, Mondy, CP, Usseglio-Polatera, P, Brack, W and Schafer, RB (2014) Organic chemicals jeopardize the health of freshwater ecosystems on the continental scale. Proc Natl Acad Sci USA 111(26), 9549–9554.
Mallatt, J (1985) Fish gill structural changes induced by toxicants and other irritants: A statistical review. Can J Fish Aquat Sci 42(4), 630–648.
Mazon, AF, Cerqueira, CC and Fernandes, MN (2002) Gill cellular changes induced by copper exposure in the South American tropical freshwater fish Prochilodus scrofa. Environ Res 88(1), 52–63.
Monteiro, SM, Rocha, E, Fontaínhas-Fernandes, A and Sousa, M (2008) Quantitative histopathology of Oreochromis niloticus gills after copper exposure. J Fish Biol 73(6), 1376–1392.
Mucha, AP, Bordalo, AA and Vasconcelos, MT (2004) Sediment quality in the Douro river estuary based on trace metal contents, macrobenthic community and elutriate sediment toxicity test (ESTT). J Environ Monit 6(7), 585–592.
Pereira, S, Pinto, AL, Cortes, R, Fontainhas-Fernandes, A, Coimbra, AM and Monteiro, SM (2013) Gill histopathological and oxidative stress evaluation in native fish captured in Portuguese northwestern rivers. Ecotoxicol Environ Saf 90(0), 157–166.
Raven, PJ, Fox, P, Everard, M, Holmes, NTH and Dawson, FH (1997) River habitat survey: A new system for classifying rivers according to their habitat quality. In Freshwater Quality: Defining the Indefinable?, Boon, PJ and Howell, DL (Eds.). The Stationery Office, Edinburgh, pp. 215–234.
Raven, PJ, Holmes, NTH, Dawson, FH and Everard, M (1998) Quality assessment using river habitat survey data. Aquat Conserv Mar Freshw Ecosyst 8, 477–499.
Rocha, MJ, Cruzeiro, C, Ferreira, C and Rocha, E (2012) Occurrence of endocrine disruptor compounds in the estuary of the Iberian Douro River and nearby Porto Coast (NW Portugal). Toxicol Environ Chem 94, 252–261.
Schlacher, TA, Mondon, JA and Connolly, RM (2007) Estuarine fish health assessment: Evidence of wastewater impacts based on nitrogen isotopes and histopathology. Mar Pollut Bull 54(11), 1762–1776.
Van Der Oost, R, Beyer, J and Vermeulen, NP (2003) Fish bioaccumulation and biomarkers in environmental risk assessment: A review. Environ Toxicol Pharmacol 13(2), 57–149.
Whitfield, AK and Elliott, M (2002) Fishes as indicators of environmental and ecological changes within estuaries: A review of progress and some suggestions for the future. J Fish Biol 61(sa), 229–250.
Yancheva, V, Velcheva, I, Stoyanova, S and Georgieva, E (2016) Histological biomarkers in fish as a tool in ecological risk assessment and monitoring programs: A review. Appl Ecol Environ Res 14(1), 47–75.