Reproductive traits of Gymnogeophagus labiatus (Teleostei, Cichlidae), in an upper stretch of Sinos river, Caraá, Brazil
This work describes the reproduction of Gymnogeophagus labiatus (Hensel, 1870) from an upper stretch of Sinos river, southern Brazil, based on the analysis of 174 males and 132 females captured in monthly samples taken from January to December 2007. Results showed that reproductive activity occur in...
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| Format: | Article |
| Language: | English |
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Fundação Zoobotânica do Rio Grande do Sul
2011-09-01
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| Series: | Iheringia: Série Zoologia |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212011000200007&lng=en&tlng=en |
| _version_ | 1811197460314324992 |
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| author | Júlia T. Verba Vinicius R. Lampert Marco A. Azevedo |
| author_facet | Júlia T. Verba Vinicius R. Lampert Marco A. Azevedo |
| author_sort | Júlia T. Verba |
| collection | DOAJ |
| description | This work describes the reproduction of Gymnogeophagus labiatus (Hensel, 1870) from an upper stretch of Sinos river, southern Brazil, based on the analysis of 174 males and 132 females captured in monthly samples taken from January to December 2007. Results showed that reproductive activity occur in spring and summer although ripe males were found along the year. The standard length of the smallest ripe male was 104.74 mm (Lt) and the smallest ripe female was 55.00 mm (Lt). There was a significant difference in total sex ratio, with 1.32 males to each female (χ2 = 5.76). Males were much more abundant in March (1.75 males: 1 female) and December (5 males: 1 female). Females were more abundant in the 62├77 mm interval (1 male: 2.36 female) while males were more abundant in the 77├92 mm size interval (2.57 males: 1 female). The largest length intervals were composed of only males. Mean absolute fecundity was 113.4 (± 31.24 sd) and mean relative fecundity was 0.0125 (± 0.0026 sd) oocytes/mg. In ripe ovaries, small-diameter oocytes were observed at high frequencies while larger ones occurred at lower frequencies. This pattern is common in fishes with asynchronous oocyte development. Characteristics of G. labiatus, such as low fecundity, asynchrony in oocyte development, multiple spawning, and its well-known parental care behavior, are consistent with an equilibrium strategy, as proposed for other cichlids. |
| first_indexed | 2024-04-12T01:15:12Z |
| format | Article |
| id | doaj.art-284e4e03c1b64e3cb38b7fbcf93149cd |
| institution | Directory Open Access Journal |
| issn | 1678-4766 |
| language | English |
| last_indexed | 2024-04-12T01:15:12Z |
| publishDate | 2011-09-01 |
| publisher | Fundação Zoobotânica do Rio Grande do Sul |
| record_format | Article |
| series | Iheringia: Série Zoologia |
| spelling | doaj.art-284e4e03c1b64e3cb38b7fbcf93149cd2022-12-22T03:54:00ZengFundação Zoobotânica do Rio Grande do SulIheringia: Série Zoologia1678-47662011-09-01101320020610.1590/S0073-47212011000200007S0073-47212011000200007Reproductive traits of Gymnogeophagus labiatus (Teleostei, Cichlidae), in an upper stretch of Sinos river, Caraá, BrazilJúlia T. Verba0Vinicius R. Lampert1Marco A. Azevedo2Instituto Nacional de Pesquisas da AmazôniaUniversidade Federal do Rio Grande do SulFundação Zoobotânica do Rio Grande do SulThis work describes the reproduction of Gymnogeophagus labiatus (Hensel, 1870) from an upper stretch of Sinos river, southern Brazil, based on the analysis of 174 males and 132 females captured in monthly samples taken from January to December 2007. Results showed that reproductive activity occur in spring and summer although ripe males were found along the year. The standard length of the smallest ripe male was 104.74 mm (Lt) and the smallest ripe female was 55.00 mm (Lt). There was a significant difference in total sex ratio, with 1.32 males to each female (χ2 = 5.76). Males were much more abundant in March (1.75 males: 1 female) and December (5 males: 1 female). Females were more abundant in the 62├77 mm interval (1 male: 2.36 female) while males were more abundant in the 77├92 mm size interval (2.57 males: 1 female). The largest length intervals were composed of only males. Mean absolute fecundity was 113.4 (± 31.24 sd) and mean relative fecundity was 0.0125 (± 0.0026 sd) oocytes/mg. In ripe ovaries, small-diameter oocytes were observed at high frequencies while larger ones occurred at lower frequencies. This pattern is common in fishes with asynchronous oocyte development. Characteristics of G. labiatus, such as low fecundity, asynchrony in oocyte development, multiple spawning, and its well-known parental care behavior, are consistent with an equilibrium strategy, as proposed for other cichlids.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212011000200007&lng=en&tlng=enCiclídeosNeotropicalreproduçãofecundidadedesenvolvimento ovocitário |
| spellingShingle | Júlia T. Verba Vinicius R. Lampert Marco A. Azevedo Reproductive traits of Gymnogeophagus labiatus (Teleostei, Cichlidae), in an upper stretch of Sinos river, Caraá, Brazil Iheringia: Série Zoologia Ciclídeos Neotropical reprodução fecundidade desenvolvimento ovocitário |
| title | Reproductive traits of Gymnogeophagus labiatus (Teleostei, Cichlidae), in an upper stretch of Sinos river, Caraá, Brazil |
| title_full | Reproductive traits of Gymnogeophagus labiatus (Teleostei, Cichlidae), in an upper stretch of Sinos river, Caraá, Brazil |
| title_fullStr | Reproductive traits of Gymnogeophagus labiatus (Teleostei, Cichlidae), in an upper stretch of Sinos river, Caraá, Brazil |
| title_full_unstemmed | Reproductive traits of Gymnogeophagus labiatus (Teleostei, Cichlidae), in an upper stretch of Sinos river, Caraá, Brazil |
| title_short | Reproductive traits of Gymnogeophagus labiatus (Teleostei, Cichlidae), in an upper stretch of Sinos river, Caraá, Brazil |
| title_sort | reproductive traits of gymnogeophagus labiatus teleostei cichlidae in an upper stretch of sinos river caraa brazil |
| topic | Ciclídeos Neotropical reprodução fecundidade desenvolvimento ovocitário |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212011000200007&lng=en&tlng=en |
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