Fish die-off in river and reservoir: A review on anoxia and gas supersaturation
Abstract Albeit massive fish mortality has an extraordinary visual impact and is certainly a fatality, we still have rudimentary understanding on how addressing this problem in the Neotropical region. The processes that lead to fish die-off events are complex and sometimes ephemeral, which can lead...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Ictiologia
2021-07-01
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| Series: | Neotropical Ichthyology |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252021000300301&tlng=en |
| _version_ | 1818988950651404288 |
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| author | Angelo Antonio Agostinho Diego Correa Alves Luiz Carlos Gomes Rosa Maria Dias Miguel Petrere Jr Fernando Mayer Pelicice |
| author_facet | Angelo Antonio Agostinho Diego Correa Alves Luiz Carlos Gomes Rosa Maria Dias Miguel Petrere Jr Fernando Mayer Pelicice |
| author_sort | Angelo Antonio Agostinho |
| collection | DOAJ |
| description | Abstract Albeit massive fish mortality has an extraordinary visual impact and is certainly a fatality, we still have rudimentary understanding on how addressing this problem in the Neotropical region. The processes that lead to fish die-off events are complex and sometimes ephemeral, which can lead to incorrect diagnosis. In this review, we discuss these events in Neotropical freshwaters, both in areas impacted by dams and natural environment, with a focus on deaths mediated by the lack of oxygen (anoxia) or the excess of dissolved gases (gas supersaturation). We examine the available knowledge about the related mechanisms, lethal thresholds for dissolved oxygen (DO) and total dissolved gases (TDG) for fish, and the sequelae of gas bubble disease (GBD). An assessment of the main mortality events in Brazil in the last 10 years is also presented, as well as the best practices for monitoring, prevention, and mitigation. Finally, it is concluded that the proliferation of hydroelectric plants in the Neotropical region might contribute to the expansion of these events and, consequently, increasing of impacts on fish conservation. We consider urgent the inclusion of this topic in the licensing processes for new hydropower projects by the environmental agencies. |
| first_indexed | 2024-12-20T19:30:44Z |
| format | Article |
| id | doaj.art-3373ace1488e4b228f437230f5d76560 |
| institution | Directory Open Access Journal |
| issn | 1982-0224 |
| language | English |
| last_indexed | 2024-12-20T19:30:44Z |
| publishDate | 2021-07-01 |
| publisher | Sociedade Brasileira de Ictiologia |
| record_format | Article |
| series | Neotropical Ichthyology |
| spelling | doaj.art-3373ace1488e4b228f437230f5d765602022-12-21T19:28:47ZengSociedade Brasileira de IctiologiaNeotropical Ichthyology1982-02242021-07-0119310.1590/1982-0224-2021-0037Fish die-off in river and reservoir: A review on anoxia and gas supersaturationAngelo Antonio Agostinhohttps://orcid.org/0000-0002-4707-9444Diego Correa Alveshttps://orcid.org/0000-0002-2109-9738Luiz Carlos Gomeshttps://orcid.org/0000-0001-7295-723XRosa Maria Diashttps://orcid.org/0000-0002-5898-0350Miguel Petrere Jrhttps://orcid.org/0000-0003-2000-6699Fernando Mayer Pelicicehttps://orcid.org/0000-0002-9700-1194Abstract Albeit massive fish mortality has an extraordinary visual impact and is certainly a fatality, we still have rudimentary understanding on how addressing this problem in the Neotropical region. The processes that lead to fish die-off events are complex and sometimes ephemeral, which can lead to incorrect diagnosis. In this review, we discuss these events in Neotropical freshwaters, both in areas impacted by dams and natural environment, with a focus on deaths mediated by the lack of oxygen (anoxia) or the excess of dissolved gases (gas supersaturation). We examine the available knowledge about the related mechanisms, lethal thresholds for dissolved oxygen (DO) and total dissolved gases (TDG) for fish, and the sequelae of gas bubble disease (GBD). An assessment of the main mortality events in Brazil in the last 10 years is also presented, as well as the best practices for monitoring, prevention, and mitigation. Finally, it is concluded that the proliferation of hydroelectric plants in the Neotropical region might contribute to the expansion of these events and, consequently, increasing of impacts on fish conservation. We consider urgent the inclusion of this topic in the licensing processes for new hydropower projects by the environmental agencies.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252021000300301&tlng=enDamEmbolismFish mortalityHypoxiaSpillway |
| spellingShingle | Angelo Antonio Agostinho Diego Correa Alves Luiz Carlos Gomes Rosa Maria Dias Miguel Petrere Jr Fernando Mayer Pelicice Fish die-off in river and reservoir: A review on anoxia and gas supersaturation Neotropical Ichthyology Dam Embolism Fish mortality Hypoxia Spillway |
| title | Fish die-off in river and reservoir: A review on anoxia and gas supersaturation |
| title_full | Fish die-off in river and reservoir: A review on anoxia and gas supersaturation |
| title_fullStr | Fish die-off in river and reservoir: A review on anoxia and gas supersaturation |
| title_full_unstemmed | Fish die-off in river and reservoir: A review on anoxia and gas supersaturation |
| title_short | Fish die-off in river and reservoir: A review on anoxia and gas supersaturation |
| title_sort | fish die off in river and reservoir a review on anoxia and gas supersaturation |
| topic | Dam Embolism Fish mortality Hypoxia Spillway |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252021000300301&tlng=en |
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