Reproductive cycle of the tetra Astyanax bimaculatus (Characiformes: Characidae) collected in Amazonian streams
| Autor: | Jeane Rodrigues Rodrigues, Rafael Henrique Nóbrega, Diógenes Henrique de Siqueira-Silva, Caio Maximino, Jhennifer Gomes Cordeiro, Maira da Silva Rodrigues, George Shigueki Yasui, Rafaela Manchin Bertolini |
|---|---|
| Přispěvatelé: | Pará, Chico Mendes Institute of Biodiversity Conservation, Universidade Estadual Paulista (Unesp), University of Saõ Paulo, PPG in Biodiversity and Biotechnology (BIONORTE) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Germinal epithelium Morphology media_common.quotation_subject Amazonian Zoology Haematoxylin Characiformes 010603 evolutionary biology 01 natural sciences chemistry.chemical_compound Oogenesis Spermatogenesis media_common biology 010604 marine biology & hydrobiology Reproduction Cell Biology biology.organism_classification Characidae Fish chemistry Development of the gonads Developmental Biology |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| Popis: | Made available in DSpace on 2020-12-12T02:27:46Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-01-01 SummaryA histological characterization of gonadal development in the tetra Astyanax bimaculatus was performed, aimed at determining its reproductive cycle in streams localized inside the Amazonian forest. Collections were carried out monthly from August 2017 to July 2018 at the Zoobotânica Foundation of Marabá, PA. Collected specimens were weighed and measured, and their gonads and liver were removed and weighed to calculate gonadosomatic and hepatosomatic indexes. Gonads were fixed and treated for routine histology for light microscopy. Materials were stained with toluidine blue and haematoxylin and eosin. The Amazonian A. bimaculatus species presented two reproductive periods in the year, one at the end of the winter season and another during the summer. Females showed an asynchronous development of their oocytes and only two reproductive phases of development were observed during the whole period 'developing' and 'spawning capable'. Males presented cystic spermatogenesis, with an anastomosing tubular testis containing spermatogonia spread along the germinal epithelium (unrestricted spermatogonial). These morphological characteristics are considered phylogenetically more primitive. Male specimens were observed to have five different phases during the period: Immature, initial maturation, mid maturation, final maturation and regression. The huge fluctuations in Amazonian streams was observed, in which water volumes varied considerably across seasons, culminating even in total drought. In spite of this, A. bimaculatus could be found during all seasons, showing its impressive reproductive adaptation to its conditions. Research Group on the Reproduction of Amazon Fish (GERPA/LANEC) Biology Faculty (FACBIO) University of South and Southern of Pará (Unifesspa) Marabá Pará Laboratory of Fish Biotechnology National Center for Research and Conservation of Continental Fish Chico Mendes Institute of Biodiversity Conservation Reproductive and Molecular Biology Group Department of Morphology Institute of Biosciences Saõ Paulo State University (UNESP) Department of Veterinary Medicine FZEA University of Saõ Paulo PPG in Biodiversity and Biotechnology (BIONORTE) Reproductive and Molecular Biology Group Department of Morphology Institute of Biosciences Saõ Paulo State University (UNESP) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|