Reproductive characteristics and the weight-length relationship in Anableps anableps (Linnaeus, 1758) (Cyprinodontiformes: Anablepidae) from the Amazon Estuary
The present study analyzed the length-weight relationship and some aspects of the reproductive biology of Anableps anableps from the mouth of the Maracanã River, in the Brazilian state of Pará. The specimens were collected using two 30 m-long gillnets with 15 and 20 mm mesh size, as well as a 1 m-di...
| Autor principal: | OLIVEIRA, Valéria de Albuquerque |
|---|---|
| Outros Autores: | FONTOURA, Nelson Ferreira, MONTAG, Luciano Fogaça de Assis |
| Grau: | Artigo |
| Idioma: | eng |
| Publicado em: |
2014
|
| Assuntos: | |
| Acesso em linha: |
http://repositorio.ufpa.br/jspui/handle/2011/5120 |
| id |
ir-2011-5120 |
|---|---|
| recordtype |
dspace |
| spelling |
ir-2011-51202018-01-15T15:35:10Z Reproductive characteristics and the weight-length relationship in Anableps anableps (Linnaeus, 1758) (Cyprinodontiformes: Anablepidae) from the Amazon Estuary OLIVEIRA, Valéria de Albuquerque FONTOURA, Nelson Ferreira MONTAG, Luciano Fogaça de Assis Anableps Peixe Reprodução (Biologia) Biologia reprodutiva Pará - Estado The present study analyzed the length-weight relationship and some aspects of the reproductive biology of Anableps anableps from the mouth of the Maracanã River, in the Brazilian state of Pará. The specimens were collected using two 30 m-long gillnets with 15 and 20 mm mesh size, as well as a 1 m-diameter hand net with a 10 mm mesh. A total of 865 specimens were collected, from which an adult sex ratio of 2.12 females per male was recorded (χ² = 13.07; p<0.05). Females presented positively allometric growth, whereas males were negatively allometric. In the additional analyses, the gonads of 371 female specimens were observed microscopically. Gonadal development was classified in three stages: immature (5.0%), maturing (12.0%), and mature (83.0%). Embryonic development was classified in five phases, according to the size of the embryo and the vitelline sac. Mean fecundity was 12 eggs/embryos per female (range: 1-37 eggs/embryos). A significant relationship was recorded between the standard length of females and ovaries weight (R² = 0.257; p < 0.001), and the number of embryos carried (R² = 0.573; p < 0.001). Mean body length of females at initial sexual maturation (L50) was estimated at 11.7 cm. The species reproduced throughout the year. O presente estudo analisou a relação peso-comprimento e uma série de aspectos da biologia reprodutiva de Anableps anableps da foz do rio Maracanã, no estado brasileiro do Pará. Os espécimes foram coletados por meio de duas redes de emalhar de 30 m de comprimento, com malhas de 15 e 20 mm, e com um puçá com um metro de diâmetro, com malha de 10 mm. Foram capturados 865 espécimes, os quais foram analisados para estabelecer a razão sexual, que foi de 2,12 fêmeas por macho (χ² = 13,07; p<0,05). As fêmeas apresentaram crescimento alométrico positivo, enquanto que os machos foram alométricos negativos. Nas análises adicionais, as gônadas de 371 fêmeas foram observadas ao microscópio. O desenvolvimento gonadal foi classificado em três estádios: imaturo (5,0%), em maturação (12,0%) e maturo (83,0%). O desenvolvimento embrionário foi classificado em cinco fases, de acordo com o tamanho do embrião e do saco vitelino. A fecundidade média foi de 12 ovos / embriões por fêmea (variando de 1-37 ovos / embriões). Uma relação significativa foi verificada entre o comprimento padrão das fêmeas, o peso de seus ovários (R² = 0,257, p < 0,001), e o número de embriões (R² = 0,573, p < 0,001). O tamanho médio da primeira maturação sexual (L50) para as fêmeas foi estimado em 11,7 cm. A espécie se reproduz durante todo o ano. 2014-06-24T13:06:20Z 2014-06-24T13:06:20Z 2011 Artigo de Periódico OLIVEIRA, Valéria de Albuquerque; FONTOURA, Nelson Ferreira; MONTAG, Luciano Fogaça de Assis. Reproductive characteristics and the weight-length relationship in Anableps anableps (Linnaeus, 1758) (Cyprinodontiformes: Anablepidae) from the Amazon Estuary. Neotropical Ichthyology, Porto Alegre, v. 9, n. 4, p. 757-466, 2011. Disponível em: <http://www.scielo.br/pdf/ni/v9n4/aop4511.pdf>. Acesso em: 04 fev. 2014. <http://dx.doi.org/10.1590/S1679-62252011005000042>. 1679-6225 http://repositorio.ufpa.br/jspui/handle/2011/5120 eng Acesso Aberto application/pdf |
| institution |
Repositório Institucional - Universidade Federal do Pará |
| collection |
RI-UFPA |
| language |
eng |
| topic |
Anableps Peixe Reprodução (Biologia) Biologia reprodutiva Pará - Estado |
| spellingShingle |
Anableps Peixe Reprodução (Biologia) Biologia reprodutiva Pará - Estado OLIVEIRA, Valéria de Albuquerque Reproductive characteristics and the weight-length relationship in Anableps anableps (Linnaeus, 1758) (Cyprinodontiformes: Anablepidae) from the Amazon Estuary |
| topic_facet |
Anableps Peixe Reprodução (Biologia) Biologia reprodutiva Pará - Estado |
| description |
The present study analyzed the length-weight relationship and some aspects of the reproductive biology of Anableps anableps from the mouth of the Maracanã River, in the Brazilian state of Pará. The specimens were collected using two 30 m-long gillnets with 15 and 20 mm mesh size, as well as a 1 m-diameter hand net with a 10 mm mesh. A total of 865 specimens were collected, from which an adult sex ratio of 2.12 females per male was recorded (χ² = 13.07; p<0.05). Females presented positively allometric growth, whereas males were negatively allometric. In the additional analyses, the gonads of 371 female specimens were observed microscopically. Gonadal development was classified in three stages: immature (5.0%), maturing (12.0%), and mature (83.0%). Embryonic development was classified in five phases, according to the size of the embryo and the vitelline sac. Mean fecundity was 12 eggs/embryos per female (range: 1-37 eggs/embryos). A significant relationship was recorded between the standard length of females and ovaries weight (R² = 0.257; p < 0.001), and the number of embryos carried (R² = 0.573; p < 0.001). Mean body length of females at initial sexual maturation (L50) was estimated at 11.7 cm. The species reproduced throughout the year. |
| format |
Artigo |
| author |
OLIVEIRA, Valéria de Albuquerque |
| author2 |
FONTOURA, Nelson Ferreira MONTAG, Luciano Fogaça de Assis |
| author2Str |
FONTOURA, Nelson Ferreira MONTAG, Luciano Fogaça de Assis |
| title |
Reproductive characteristics and the weight-length relationship in Anableps anableps (Linnaeus, 1758) (Cyprinodontiformes: Anablepidae) from the Amazon Estuary |
| title_short |
Reproductive characteristics and the weight-length relationship in Anableps anableps (Linnaeus, 1758) (Cyprinodontiformes: Anablepidae) from the Amazon Estuary |
| title_full |
Reproductive characteristics and the weight-length relationship in Anableps anableps (Linnaeus, 1758) (Cyprinodontiformes: Anablepidae) from the Amazon Estuary |
| title_fullStr |
Reproductive characteristics and the weight-length relationship in Anableps anableps (Linnaeus, 1758) (Cyprinodontiformes: Anablepidae) from the Amazon Estuary |
| title_full_unstemmed |
Reproductive characteristics and the weight-length relationship in Anableps anableps (Linnaeus, 1758) (Cyprinodontiformes: Anablepidae) from the Amazon Estuary |
| title_sort |
reproductive characteristics and the weight-length relationship in anableps anableps (linnaeus, 1758) (cyprinodontiformes: anablepidae) from the amazon estuary |
| publishDate |
2014 |
| url |
http://repositorio.ufpa.br/jspui/handle/2011/5120 |
| _version_ |
1787148576001884160 |
| score |
11.653393 |