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| Fernandes,Cezar A. F.; Oliveira,Paulo G. V. de; Travassos,Paulo E. P.; Hazin,Fábio H. V.. |
| Reproductive aspects of the Brazilian snapper Lutjanus alexandrei, were characterized, including a description of the development of oocytes and spermatogenic cells, size at first sexual maturity, and fecundity. A total of 540 fish were analyzed with 250 having their gonads sectioned to allow microscopic evaluation. Six maturity stages were identified for females and males: immature, maturing, mature, spawning, spawned, and resting. Fish standard length (SL) varied from 13.0 to 28.3 cm and sex ratio was 1.6 males: 1.0 females. Monthly distributions of mean Gonadosomatic Index (GSI) and maturity stages suggest that spawning occurs mainly in a protracted period, during the warmer months, from November to March. The size of first sexual maturity was estimated... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Multiple spawning; Oocytes; Sexual maturity; Spermatogenic cells. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000300012 |
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| Vieira,Augusto B. C.; Salvador-Jr.,Luiz F.; Melo,Rafael M. C.; Santos,Gilmar B.; Bazzoli,Nilo. |
| To analyze the reproductive biology of the peacock bass Cichla piquiti, 361 specimens were collected bimonthly in the Itumbiara Reservoir, southeast Brazil, from December 2004 to November 2005. Males and females in reproductive activity occurred during almost the entire year, with reproductive peak occurring before the beginning of the rains when the water temperature remained low, indicating that these environmental variables do not directly influence in the reproduction of C. piquiti. The long reproductive period, partially spent ovaries contained postovulatory follicles and oocytes in all developmental stages, indicate asynchronous development of oocytes and multiple spawning. The mean total lengthand body weigth were, respectively, 38.2 ± 7 cm and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Reproduction; Multiple spawning; Body condition; Phenotypic plasticity. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400024 |
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| Cavalheiro,Laísa W.; Fialho,Clarice B.. |
| ABSTRACT Atlantirivulus riograndensis (Costa & Lanés, 2009) is a fish registered to the basin of Patos lagoon and the adjacent coastal plains in southern states of Rio Grande do Sul and Santa Catarina, Brazil, found in shallow water courses with that have large quantities of aquatic vegetation and forest edges. The objective of this study was to investigate the reproductive strategy and tactics of this species including the sex ratio, the length at first maturity, spawning type, fecundity and the possible associations among reproduction and abiotic factors. Sampling of specimens occurred in perennial wetlands within the Banhado dos Pachecos wildlife refuge, in the city of Viamão, state of Rio Grande do Sul, Brazil, which is a conservation unit that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Atlantirivulus riograndensis; Gonadal development; Multiple spawning; Fecundity. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212015000300288 |
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