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| Registros recuperados: 20 | |
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| Vaz-dos-Santos,André Martins; Rossi-Wongtschowski,Carmen Lúcia Del Bianco; Honji,Renato Massaaki; Bannwart,Denis. |
| This study describes the reproduction of the silver John dory, Zenopsis conchifer, based on data collected before its fishery exploitation in the southwestern Atlantic, Brazil, in the early 2000s. Biological material was collected through bottom-trawl surveys in 2001 and 2002 from depths of 100 to 600 m. A total of 1,056 individuals ranging from 57 to 504 mm Ls were analyzed. A sex ratio analysis showed that males were predominant among the shorter fishes (< 240 mm Ls) and females among the longer ones (> 320 mm Ls). Between 240 mm and 319 mm Ls sex-ratio was 1:1. The silver John dory is a multiple spawner. Spawning is protracted and more intensive during August and November, when both females and males in spawning capable actively spawning and in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Spawning period and area; Length at first maturation; Sex ratio; Gonadosomatic index. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032014000300120 |
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| Eduardo,Leandro N.; Lira,Alex S.; Frédou,Thierry; Frédou,Flavia Lucena. |
| ABSTRACT: Roughneck Grunt (Haemulopsis corvinaeformis Steindachner, 1868) is the second most important species caught as bycatch of the shrimp fishery in Pernambuco, Northeastern Brazil. However, the population dynamic of this species is poorly known in the region. The aim of this study was to describe aspects of the population structure and reproductive biology of the H. corvinaeformis, providing important information for the development of sustainable management practices. Specimens were collected monthly from August 2011 to July 2012 and quarterly from October 2012 to June 2014. A total of 1,140 individuals was collected; 340 males (29.8%), 391 females (34.3%), and 409 were immature and could not be sexed (35.9%). Total length ranged from 7 to 25 cm. In... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dynamic population; Gonadosomatic index; Isometric growth. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212018000100207 |
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| Chehade,Chayrra; Cassel,Mônica; Borella,Maria Inês. |
| Captive reproduction is one of the problems faced in aquaculture requiring the manipulation of environmental factors and/or hormonal treatment. Thus, we seek to verify experimentally which gonadal changes were present in mature individuals of Astyanax altiparanae arising from decreased water level. Collections were made every four hours, initiated four hours before and finished 28 hours after stimulation, at the Fish Farming Station of Companhia Energética de São Paulo, São Paulo, Brazil. The gonads were analyzed by light microscopy. The females had ovaries in the spawning capable phase until 12h; in 16h, in a more advanced stage of spawning capable phase; and, from 20h, in the regressing phase. Males had testes in the spawning capable phase until 8h; in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Asynchronous reproduction; Characidae; Gametogenesis; Gonadosomatic index; Histology. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000100205 |
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| Alonso,Felipe; Cánepa,Maximiliano; Moreira,Renata Guimarães; Pandolfi,Matías. |
| In this work we describe for the first time the social and reproductive behavior of the Neotropical fish Cichlasoma dimerus (Heckel, 1840) [Perciformes: Cichlidae], endemic to the Paraná River basin, using a comprehensive-integral approach, including morphological and physiological features. This substrate breeding fish has biparental care of the fry and presents a dominance hierarchy that determines access to breeding territories among males, and to males with territories among females. Gregarious behavior associated with a pale body color, was observed before reproductive behaviors started. Afterwards, a dominance hierarchy was established through aggressive interactions. Territorial individuals had bright body color patterns and non territorial an... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cichlidae; Cortisol; Gonadosomatic index; Gonadotropins; Somatolactin. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000300009 |
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| Paschoalini,Alessandro Loureiro; Perini,Violeta da Rocha; Ribeiro,Dirceu Marzulo; Formagio,Paulo Sérgio; Rizzo,Elizete; Bazzoli,Nilo. |
| The alterations to the hydrologic regime downstream from hydroelectric dams may cause an impact on the reproductive success of fishes. This study aimed to analyse the influence of the physical and chemical parameters of the water of the Grande and Pardo Rivers on gonadal maturation, oocyte diameter, follicular atresia and biological indices of Pimelodus maculatus collected from three river sections: Grande River, downstream from the Porto Colômbia dam (S1), Grande River, downstream from the confluence with the Pardo River (S2) and in the Pardo River channel (S3). Males and females captured in S1 presented significantly higher average values for total length and body weight than those captured in S2 and S3. The gonadosomatic index values were significantly... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Abiotic factors; Dam impacts; Environmental impacts; Gonadosomatic index. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000300615 |
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| Nascimento,Aline Virtude do; Marcon,Lucas; Santos,José Enemir dos; Santiago,Kleber Biana; Rizzo,Elizete; Bazzoli,Nilo. |
| Abstract In this study, we determined the main reproductive parameters of piau gordura, Leporinus piau, in two sections of the São Francisco River basin. Between May 2015 and April 2016, a total of 573 specimens were captured from a lentic environment (section 1), the Três Marias Reservoir (TMR), and a lotic environment (section 2), downstream of the TMR at the confluence of the São Francisco River (SFR) with the Abaeté River. Analysis of reproductive activity showed that L. piau from both sections reproduced, but females and males from section 1 exhibited higher total length, body weight, Fulton condition factor, and gonadosomatic index values, as compared to section 2. Sexual dimorphism was evident in the species, with females being larger than males.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fecundity; Follicles; Gonadal maturation; Gonadosomatic index. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000400209 |
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| Nunes,Diego Mendes Ferreira; Magalhães,André Lincoln Barroso; Weber,André Alberto; Gomes,Rafael Zeferino; Normando,Felipe Talin; Santiago,Kleber Biana; Rizzo,Elizete; Bazzoli,Nilo. |
| A total of 312 adults of matrinxã were captured bimonthly, between 2011-2012, in two sites of the rio São Francisco: immediately downstream of the Três Marias Dam (site 1) and in the confluence with the rio Abaeté (site 2). Specimens of Brycon orthotaenia from site 2 presented higher values of total length (32.24 ± 5.70 cm for females and 26.64 ± 3.79 cm for males) and body weight (506.66 ± 332.17 g for females and 267.36 ± 145.84 g for males), when compared with the site 1. In site 2 was registered the highest GSI means (9.97 ± 2.96 for females and 0.93 ± 0.52 for males), compared with the site 1 means. Reproduction period occurred from October to February. Unlike site 2, no spawned females or spent males were captured in site 1. Significant differences... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Conservation; Gonadosomatic index; Neotropical fish; Migratory fish; Reproduction. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000200317 |
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| Navarro,Fernanda Keley Silva Pereira; Navarro,Rodrigo Diana; Murgas,Luis David Solis; Pereira,Marina Apocalypse Nogueira; Hundley,Guilherme Crispim. |
| The objective of this work was to evaluate the effect of photoperiod on luteinizing hormone (LH) plasma levels and gonadal maturation of lambari females. One hundred and twenty adult lambaris, distributed into 12 aquaria of 20 L each, were randomly subjected to three different treatments, in a completely randomized design, and four replicates. Treatments were photoperiods in hours of light (L) and darkness (D): T1, 0 L:24 D; T2, 12 L:12 D; T3, 24 L:0 D. After 40 days, fish were subjected to fasting for 24 hours and, then, anesthetized. Immediately after slaughter, fish were weighed, and their gonads and livers were removed and weighed. Ovaries were weighed and immersed in Bouin's fixative solution for 24 hours and, then, kept in 70% alcohol until... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Astyanax bimaculatus; Native species; Gonadosomatic index; Hepatosomatic index; Oogenesis. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2013000800039 |
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| Queiroga,Fernando R.; Golzio,Jéssica E.; Santos,Raphaela B. dos; Martins,Tayná O.; Vendel,Ana Lúcia. |
| The present study investigated the reproductive biology of Sciades herzbergii in the Paraíba do Norte River Estuary, Brazil. We aimed to characterize the reproduction of the species with respect to sex ratio, spawning season, condition factor and length at first maturity. Specimens were captured between August 2009 and July 2010 in a stretch of the main channel of the estuary. In the laboratory, they were measured, weighed and macroscopically classified with regard to sex and gonad development stage, and their gonads were weighted. The monthly distribution of the sexes and their respective stages of maturation were determined. The gonadosomatic index (GSI), condition factor (K) and the length at first maturity were calculated for males and females. The sex... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Condition factor; Gonadosomatic index; Mean length at first maturity; Paraíba do Norte River Estuary; Pemecou sea catfish; Spawning period. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702012000500002 |
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| Araújo,Francisco Gerson; Duarte,Silvana; Goldberg,Rubens Sterental; Fichberg,Liana. |
| Parauchenipterus striatulus is a representative of the freshwater catfish with wide distribution in the South America region. Despite of being a very abundant fish in rivers and reservoirs of this region, little is known about its biology and ecology. In Ribeirão das Lajes reservoir (22º42'S - 22º50'S, 43º53'- 44º05' W, Rio de Janeiro), the Rio de Janeiro state's largest hydroelectric reservoir, this species is very abundant, representing about 40% of the total experimental fish catches using gill nets. This paper aims to assess aspects of the reproductive cycle of this species describing the gonadal stages, gonadosomatic index, weight-length relationship and condition factor. Fish sampling were carried out bi-monthly, between April 1996 and May 1997. Gill... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Auchenipteridae; Length-weight relationship; Reproduction; Condition factor; Gonadosomatic index; Reservoir. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000400016 |
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| Registros recuperados: 20 | |
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