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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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| Bazzoli,Nilo; Silva,Viviane Elizabeth de Souza; Marcon,Lucas; Santiago,Kleber Biana; Santos,José Enemir dos; Rizzo,Elizete. |
| Abstract: In order to assess the influence of the Três Marias dam on the reproduction of the white piranha, Serrasalmus brandtii, 1569 specimens captured from June 2011 to May 2012 in three sections of the São Francisco River basin were analyzed: section 1 = Três Marias reservoir (TMR); section 2 = São Francisco River (SFR) segment immediately downstream of TMR; and section 3 = SFR segment at the confluence with the Abaeté River. Total length (TL), body weight (BW), gonadosomatic index (GSI), and gonadal maturation stages were determined for each specimen, while vitellogenic follicle diameter, and absolute (AF) and relative (RF) fecundities were also determined for females. Reproductive activity, including spawned females and spermed males, was recorded... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Environmental impact; Thermal disturbances; Gonadal maturation. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032019000200206 |
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| Marcon,Lucas; Freitas,Vivian Rocha; Bazzoli,Nilo; Rizzo,Elizete; Benjamin,Laércio dos Anjos. |
| ABSTRACT: Lambari, Astyanax bimaculatus, is an oviparous, multiple-spawning fish that is reproductively active throughout the year, which makes it promising for cultivation and research. This research histologically evaluates the ovaries of lambari that have undergone artificial spawning induced with pituitary extract (control group), and the effect of growth hormone at a dose of 2 mg/g body weight (treatment group) on the subsequent process of ovarian recovery. Ovaries of fish in both the control and treatments groups were collected at 120 hours after spawning and analyzed using optical microscopy to characterize the average quantities of: follicles in different stages of development, post-ovulatory follicles, follicular atresia and granulocytes.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Atresia; Granulocytes; Post-ovulatory follicles; Freshwater fishes. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000800651 |
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| Marcon,Lucas; Silva Filho,Paulo Burlamaqui da; Lopes,Diego Senra; Mounteer,Ann Honor; Benjamin,Laércio dos Anjos. |
| O Thiodan(r) é um organoclorado a base de endosulfan que pode causar alterações morfológicas nos tecidos de peixes, dependendo da concentração e tempo de exposição. Este estudo teve como objetivo determinar a CL50-96h do Thiodan(r) (endosulfan 350g L-1) para fêmeas de lambaris Astyanax bimaculatus em período de reprodução e analisar a morfologia do desenvolvimento folicular em diferentes concentrações do agrotóxico. Foram feitos quatro experimentos: 1) sem aclimatação e sem alimentação; 2) sem aclimatação e alimentados; 3) com aclimatação de 10 dias e sem alimentação; 4) com aclimatação de 10 dias e alimentados. A CL50-96h determinada foi de 13,6µg L-1, com intervalo de confiança de 10,1 a 18,4µg L-1 (P<0,05). Em todos os experimentos, foram utilizadas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Astyanax bimaculatus; Meio ambiente; Ovário; Folículos. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014001202245 |
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