Reproductive biology of Rhaphiodon vulpinus (Ostariophysi: Cynodontidae) in the Tocantins River Basin, Brazil
In order to evaluate aspects of the reproductive biology of Rhaphiodon vulpinus in the Upper and Middle Tocantins River, samples were taken monthly from October, 1999 through September, 2001, by means of gill nets. Males, which were more abundant than females (chi2 146.87: df=1: p<0.05), matured...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Ictiologia
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| Series: | Neotropical Ichthyology |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000400007&lng=en&tlng=en |
| _version_ | 1819183135241273344 |
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| author | Andréa L. Neuberger Elineide E. Marques Carlos S. Agostinho Rafael J. de Oliveira |
| author_facet | Andréa L. Neuberger Elineide E. Marques Carlos S. Agostinho Rafael J. de Oliveira |
| author_sort | Andréa L. Neuberger |
| collection | DOAJ |
| description | In order to evaluate aspects of the reproductive biology of Rhaphiodon vulpinus in the Upper and Middle Tocantins River, samples were taken monthly from October, 1999 through September, 2001, by means of gill nets. Males, which were more abundant than females (chi2 146.87: df=1: p<0.05), matured at a smaller size. The reproductive period of the species extended essentially from November through January, with a peak of activity in November. Fecundity, with an estimated mean value of 98,185 oocytes, varied from 38,177 to 215,841 oocytes, and it did not correlate with the length of the individual female analyzed (r=0.4663: p=0.206). Relative fecundity was 130.6 oocytes/g total weight. Mature oocytes had a mean diameter of 0.98 mm, corresponding to a volume of 0.50 mm³. |
| first_indexed | 2024-12-22T22:57:12Z |
| format | Article |
| id | doaj.art-df3e563671d14bbe9cb32c5461b3dbbc |
| institution | Directory Open Access Journal |
| issn | 1982-0224 |
| language | English |
| last_indexed | 2024-12-22T22:57:12Z |
| publisher | Sociedade Brasileira de Ictiologia |
| record_format | Article |
| series | Neotropical Ichthyology |
| spelling | doaj.art-df3e563671d14bbe9cb32c5461b3dbbc2022-12-21T18:09:48ZengSociedade Brasileira de IctiologiaNeotropical Ichthyology1982-02245447948410.1590/S1679-62252007000400007S1679-62252007000400007Reproductive biology of Rhaphiodon vulpinus (Ostariophysi: Cynodontidae) in the Tocantins River Basin, BrazilAndréa L. Neuberger0Elineide E. Marques1Carlos S. Agostinho2Rafael J. de Oliveira3Universidade Federal do TocantinsUniversidade Federal do TocantinsUniversidade Federal do TocantinsUniversidade Federal do TocantinsIn order to evaluate aspects of the reproductive biology of Rhaphiodon vulpinus in the Upper and Middle Tocantins River, samples were taken monthly from October, 1999 through September, 2001, by means of gill nets. Males, which were more abundant than females (chi2 146.87: df=1: p<0.05), matured at a smaller size. The reproductive period of the species extended essentially from November through January, with a peak of activity in November. Fecundity, with an estimated mean value of 98,185 oocytes, varied from 38,177 to 215,841 oocytes, and it did not correlate with the length of the individual female analyzed (r=0.4663: p=0.206). Relative fecundity was 130.6 oocytes/g total weight. Mature oocytes had a mean diameter of 0.98 mm, corresponding to a volume of 0.50 mm³.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000400007&lng=en&tlng=enSex ratioFirst maturationReproductionFecundity |
| spellingShingle | Andréa L. Neuberger Elineide E. Marques Carlos S. Agostinho Rafael J. de Oliveira Reproductive biology of Rhaphiodon vulpinus (Ostariophysi: Cynodontidae) in the Tocantins River Basin, Brazil Neotropical Ichthyology Sex ratio First maturation Reproduction Fecundity |
| title | Reproductive biology of Rhaphiodon vulpinus (Ostariophysi: Cynodontidae) in the Tocantins River Basin, Brazil |
| title_full | Reproductive biology of Rhaphiodon vulpinus (Ostariophysi: Cynodontidae) in the Tocantins River Basin, Brazil |
| title_fullStr | Reproductive biology of Rhaphiodon vulpinus (Ostariophysi: Cynodontidae) in the Tocantins River Basin, Brazil |
| title_full_unstemmed | Reproductive biology of Rhaphiodon vulpinus (Ostariophysi: Cynodontidae) in the Tocantins River Basin, Brazil |
| title_short | Reproductive biology of Rhaphiodon vulpinus (Ostariophysi: Cynodontidae) in the Tocantins River Basin, Brazil |
| title_sort | reproductive biology of rhaphiodon vulpinus ostariophysi cynodontidae in the tocantins river basin brazil |
| topic | Sex ratio First maturation Reproduction Fecundity |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000400007&lng=en&tlng=en |
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