Occurrence of Cyanobacteria and microcystins in hydroelectric reservoirs used for fish farming

Autor(es)

Falcone-Dias, Maria Fernanda ^[1] ; Rodrigues, Marianna Vaz ^[2] ; Nielsen, Jeppe Lund ^[3] ; de Jonge, Nadieh ^[3] ; Jorgensen, Niels O. G. ^[4] ; Alonso, Diego Peres ^[2] ; David, Gianmarco S. ^[1] ; da Silva, Reinaldo Jose ^[5] ; Araujo Junior, Joao Pessoa ^[2]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Agcy Agribusiness Technol APTA Ja, CP 66 Jau, BR-17340000 Sao Paulo - Brazil

^[2] Univ Estadual Paulista UNESP Botucatu, Biosci Inst, Dept Microbiol & Immunol, BR-18618689 Botucatu, SP - Brazil

^[3] Aalborg Univ, Dept Chem & Biosci, DK-9220 Aalborg - Denmark

^[4] Univ Copenhagen, Dept Plant & Environm Sci, Frederiksberg - Denmark

^[5] Univ Estadual Paulista UNESP Botucatu, Biosci Inst, Dept Parasitol, BR-18618689 Botucatu, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF WATER AND HEALTH; v. 18, n. 6, p. 983-994, DEC 2020.
• Citações Web of Science: 0

Resumo

Fish farming can have a negative impact on water quality and aquatic organisms due to emerging blooms of Cyanobacteria and the production of cyanotoxins. In this study, the effect of aquaculture in hydroelectric reservoirs in Brazil was evaluated in six fish farms and in upstream and downstream water through analysis of the microbiome, Cyanobacteria and microcystin concentrations. Synechococcus and Microcystis were observed at all six locations, while Limnothrix was also observed abundantly at two locations. An increase in the relative abundance of Cyanobacteria inside the fish farms was observed at two locations, while an increase of Cyanobacteria was observed in downstream at five of the six locations. Microcystins were detected in significant and high values in all locations, with concentrations up to 1.59 mu g/L. The trend in microcystin concentrations was mirrored in copy numbers of the mcyE gene (encodes microcystin synthetase) and presence of Microcystis, but not in any of the other observed cyanobacterial groups. In summary, the study shows that aquaculture production influenced the water microbiome inside and downstream the fish farms, and a direct correlation was found between mcyE gene copies, microcystin production and abundance of Microcystis, but not for the total abundance of Cyanobacteria. (AU)

• Processo FAPESP: 13/50504-5 - Aperfeiçoamento da qualidade de peixes cultivados para consumo humano
• Beneficiário: Reinaldo José da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 14/13718-0 - Improved quality of cultured fish for human consumption
• Beneficiário: Marianna Vaz Rodrigues
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 15/13025-7 - Cianobactérias associadas à produção de tilápias em tanques rede: investigação da presença de cianotoxinas na água e nos peixes
• Beneficiário: Maria Fernanda Falcone Dias
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado