Reproductive aspects of females of Leporinus lacustris Campos, 1945 (Characiformes, Anostomidae) in a Neotropical floodplain
Abstract: Aim This study evaluates the reproduction and fecundity of Leporinus lacustris in upper Paraná River floodplain environments with the objectives to (i) recognize the germ cells of folliculogenesis and oogenesis; (ii) characterize reproductive phases; (iii) investigate oocyte diameter and...
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Limnologia
2024-02-01
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| Series: | Acta Limnologica Brasiliensia |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2179-975X2024000100706&lng=en&tlng=en |
| _version_ | 1827340605794025472 |
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| author | Amanda Borges dos Santos Schmidt Herick Soares de Santana Claudenice Dei Tos |
| author_facet | Amanda Borges dos Santos Schmidt Herick Soares de Santana Claudenice Dei Tos |
| author_sort | Amanda Borges dos Santos Schmidt |
| collection | DOAJ |
| description | Abstract: Aim This study evaluates the reproduction and fecundity of Leporinus lacustris in upper Paraná River floodplain environments with the objectives to (i) recognize the germ cells of folliculogenesis and oogenesis; (ii) characterize reproductive phases; (iii) investigate oocyte diameter and evaluate if this species has group synchronous or asynchronous oocyte development and if spawning is total or batch; (iv) estimate batch fecundity; (v) establish the relationship between fecundity/ovary weight, standard length, and total weight; (vi) verify the reproductive areas of this species in the upper Paraná River floodplain. Methods Sampling was carried out using gillnets in rivers, and open and closed lagoons, in March, June, September, and December 2013, 2014, 2015, 2016, 2018, and 2019 and March and September 2017. A total of 442 females were sampled and 111 subsampled, each of which had an ovary removed and fixed in Bouin solution. A subsample of 20 ovaries in the spawning capable phase were fixed in a 4% buffered formaldehyde solution to estimate the diameter of the oocytes and fecundity. The ovaries were dehydrated, embedded in historesin, cut, stained, and evaluated as regards folliculogenesis, oogenesis, development phases, and reproduction areas. Results The germ cells recorded were differentiated oogonia, primary and secondary growth oocytes, fully-grown and mature oocytes, and post-ovulatory follicles that permitted the recognition of the reproductive phases. Oocyte diameter information revealed that the species has group synchronous oocyte development, determinate fecundity and batch spawning, and eliminates an average of 38,490 oocytes. Conclusions The fact that Leporinus lacustris is reproductively successful in the Baía River and in the Fechada, Guaraná, Patos, Garças, Ventura and Ressaco do Pau Véio lagoons strengthens the importance of the areas of environmental protection of the islands and lowlands of the Paraná River, Ilha Grande National Park and Ivinheima River State Park. |
| first_indexed | 2024-03-07T21:23:53Z |
| format | Article |
| id | doaj.art-60947295296e434ab47f8cd977839b02 |
| institution | Directory Open Access Journal |
| issn | 2179-975X |
| language | English |
| last_indexed | 2024-03-07T21:23:53Z |
| publishDate | 2024-02-01 |
| publisher | Associação Brasileira de Limnologia |
| record_format | Article |
| series | Acta Limnologica Brasiliensia |
| spelling | doaj.art-60947295296e434ab47f8cd977839b022024-02-27T07:40:47ZengAssociação Brasileira de LimnologiaActa Limnologica Brasiliensia2179-975X2024-02-013610.1590/s2179-975x4822Reproductive aspects of females of Leporinus lacustris Campos, 1945 (Characiformes, Anostomidae) in a Neotropical floodplainAmanda Borges dos Santos Schmidthttps://orcid.org/0000-0002-4655-4960Herick Soares de Santanahttps://orcid.org/0000-0001-8138-5261Claudenice Dei Toshttps://orcid.org/0000-0003-2703-1889Abstract: Aim This study evaluates the reproduction and fecundity of Leporinus lacustris in upper Paraná River floodplain environments with the objectives to (i) recognize the germ cells of folliculogenesis and oogenesis; (ii) characterize reproductive phases; (iii) investigate oocyte diameter and evaluate if this species has group synchronous or asynchronous oocyte development and if spawning is total or batch; (iv) estimate batch fecundity; (v) establish the relationship between fecundity/ovary weight, standard length, and total weight; (vi) verify the reproductive areas of this species in the upper Paraná River floodplain. Methods Sampling was carried out using gillnets in rivers, and open and closed lagoons, in March, June, September, and December 2013, 2014, 2015, 2016, 2018, and 2019 and March and September 2017. A total of 442 females were sampled and 111 subsampled, each of which had an ovary removed and fixed in Bouin solution. A subsample of 20 ovaries in the spawning capable phase were fixed in a 4% buffered formaldehyde solution to estimate the diameter of the oocytes and fecundity. The ovaries were dehydrated, embedded in historesin, cut, stained, and evaluated as regards folliculogenesis, oogenesis, development phases, and reproduction areas. Results The germ cells recorded were differentiated oogonia, primary and secondary growth oocytes, fully-grown and mature oocytes, and post-ovulatory follicles that permitted the recognition of the reproductive phases. Oocyte diameter information revealed that the species has group synchronous oocyte development, determinate fecundity and batch spawning, and eliminates an average of 38,490 oocytes. Conclusions The fact that Leporinus lacustris is reproductively successful in the Baía River and in the Fechada, Guaraná, Patos, Garças, Ventura and Ressaco do Pau Véio lagoons strengthens the importance of the areas of environmental protection of the islands and lowlands of the Paraná River, Ilha Grande National Park and Ivinheima River State Park.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2179-975X2024000100706&lng=en&tlng=enoogenesisreproductive phasesspawning typefreshwater fishParaná River |
| spellingShingle | Amanda Borges dos Santos Schmidt Herick Soares de Santana Claudenice Dei Tos Reproductive aspects of females of Leporinus lacustris Campos, 1945 (Characiformes, Anostomidae) in a Neotropical floodplain Acta Limnologica Brasiliensia oogenesis reproductive phases spawning type freshwater fish Paraná River |
| title | Reproductive aspects of females of Leporinus lacustris Campos, 1945 (Characiformes, Anostomidae) in a Neotropical floodplain |
| title_full | Reproductive aspects of females of Leporinus lacustris Campos, 1945 (Characiformes, Anostomidae) in a Neotropical floodplain |
| title_fullStr | Reproductive aspects of females of Leporinus lacustris Campos, 1945 (Characiformes, Anostomidae) in a Neotropical floodplain |
| title_full_unstemmed | Reproductive aspects of females of Leporinus lacustris Campos, 1945 (Characiformes, Anostomidae) in a Neotropical floodplain |
| title_short | Reproductive aspects of females of Leporinus lacustris Campos, 1945 (Characiformes, Anostomidae) in a Neotropical floodplain |
| title_sort | reproductive aspects of females of leporinus lacustris campos 1945 characiformes anostomidae in a neotropical floodplain |
| topic | oogenesis reproductive phases spawning type freshwater fish Paraná River |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2179-975X2024000100706&lng=en&tlng=en |
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