Consulta: creatorFacets:"Bazzoli,Nilo"
Registros recuperados: 17
Data/hora: 01/06/2024 10:22:49

Comparative analysis of the reproductive activity of Leporinus piau (Characiformes: Anostomidae) in lentic and lotic environments
Provedor de dados: 83
Autores: 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

Reproduction of Pimelodus maculatus(Siluriformes: Pimelodidae) in three section of Grande River basin, downstream Porto Colombia dam, south-eastern Brazil
Provedor de dados: 83
Autores: 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

Influence of a large dam and importance of an undammed tributary on the reproductive ecology of the threatened fish matrinxã Brycon orthotaenia Günther, 1864 (Characiformes: Bryconidae) in southeastern Brazil
Provedor de dados: 83
Autores: 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

Reproductive biology of the peacock bass Cichla piquiti (Perciformes: Cichlidae), an exotic species in a Neotropical reservoir
Provedor de dados: 83
Autores: 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

Reproductive plasticity of Hypostomus affinis (Siluriformes: Loricariidae) as a mechanism to adapt to a reservoir with poor habitat complexity
Provedor de dados: 103
Autores: Duarte,Silvana; Araújo,Francisco Gerson; Bazzoli,Nilo.
In this work we describe the gonad morphology and spawning season of Hypostomus affinis (Steindachner, 1877) in a tropical reservoir based on 55 males and 125 females. Our aim was to assess eventual adaptations in reproductive tactics developed by this riverine species inhabiting an oligotrophic reservoir with low habitat complexity, few rocks and few other preferred consolidated substrata. We described the stages of cells of reproductive lineage, gonadal development and some reproductive traits which were compared with information in the available literature. Cells from the spermatogenic lineage were spermatogonia, spermatocytes, spermatids and spermatozoa, and cells from the oocytarian lineage were primary oocytes, previtelogenic oocytes, cortical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Fish reproduction; Reproductive biology; Reservoirs; Tactics.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000500005

Reproductive biology and feeding of Curimatella lepidura (Eigenmann &amp;amp; Eigenmann) (Pisces, Curimatidae) in Juramento reservoir, Minas Gerais, Brazil
Provedor de dados: 104
Autores: Alvarenga,Érika R. de; Bazzoli,Nilo; Santos,Gilmar B.; Rizzo,Elizete.
Reproductive biology and feeding of Curimatella lepidura (Eigenmann &amp;amp; Eigenmann, 1889) were studied in Juramento reservoir, São Francisco River basin, Southeastern Brazil. Histological analyses and gonadosomatic indexes revealed females and males in reproductive activity from October to March and total spawning occurring from January to March coupled with the peak of spermiating males. In the dry season, the fishes accumulated energetic reserves for reproduction during a short rainy season. The species presented sexual dimorphism, being females larger than males and sexual maturation occurring close to 7.7 cm standard length for females and 7.1 cm for males. C. lepidura presented iliophagous feeding habit, ingesting mainly sediment/detritus and a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diet; Gonadal maturation; Reproduction; São Francisco River; Spawning.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752006000200002

Reproductive biology of Moenkhausia intermedia (Eigenmann) (Pisces, Characiformes) in Itumbiara Reservoir, Goiás, Brazil
Provedor de dados: 104
Autores: Hojo,Renê Eiji Souza; Santos,Gilmar Bastos; Bazzoli,Nilo.
To study the reproductive biology of Moenkhausia intermedia (Eigenmann, 1908) in Itumbiara reservoir, Paranaíba river, Goiás, Brazil, a total of 301 specimens (237 females and 64 males) were captured quaterly from January to December 1993. The gonadosomatic index of females and males were related to morphologic variations of the gonads in different reproductive cycle stages (RCS). Analysis of RCS frequency and variations in the gonadosomatic index showed that M. intermedia reproduces during the whole year with fractional spawning. The smallest standard length at advanced maturity stage was estimated as 6.6 cm for females and 6.0 cm for males. The stomach repletion and coelomic fat indexes of both sexes reached peak values in the rest stage, suggesting that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gonads; Reproduction; Sexual dimorphism; Sexual maturation; Spawning.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752004000300015

Reproductive biology of Leporinus taeniatus Lütken (Pisces, Anostomidae) in Juramento Reservoir, São Francisco River basin, Minas Gerais, Brazil
Provedor de dados: 104
Autores: Thomé,Ralph G.; Bazzoli,Nilo; Rizzo,Elizete; Santos,Gilmar B.; Ratton,Thiago F.
The reproductive biology of the piau-jejo Leporinus taeniatus Lütken, 1875, an endemic species from the São Francisco River basin, was studied by using macroscopical and histological techniques. A total of 121 males and 94 females were captured quarterly, between March 2002 and February 2003 in the Juramento Reservoir. Females were larger than males, indicating sexual dimorphism. Stages of gonadal maturation were defined from histological analyses and gonadosomatic index. Peaks of maturing/mature and spawned/spermiated fishes has occurred in period December-February. L. taeniatus presented total spawning and group-synchronic development of the oocytes. The gonadosomatic index accompanied gonad maturation in both sexes, and coelomic fat presented lower...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Characiformes; Gonadal maturation; Piau-jejo; Reproduction; Total spawning.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752005000300006

Reproductive biology of Steindachnerina insculpta (Fernandez-Yépez) (Teleostei, Curimatidae) in Furnas reservoir, Minas Gerais, Brazil
Provedor de dados: 104
Autores: Ribeiro,Vinicius M. A.; Santos,Gilmar B.; Bazzoli,Nilo.
The 'saguiru' Steindachnerina insculpta, a small teleost detritivorous fish species in Furnas reservoir, upper rio Paraná basin, Minas Gerais, Brazil, has a prolonged period of reproductive activity that extends from September to March, with fractionated spawning. During gonadal maturation, the females showed a low hepatosomatic index, suggesting that hepatic substances are possibly transferred from liver to ovaries. During the reproductive period, this fish had lower stomach repletion and coelomic fat indexes, indicating that the species eat less and consume more fat reserves. The weight of the ovaries influenced positively the condition factor (K1), since the lowest K2 values (without the gonads weight), were obtained during maturation, confirming the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Freshwater teleost fish; Reproduction; Spawning.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752007000100009

Reproduction of the catfish Iheringichthys labrosus (Lütken) (Pisces, Siluriformes) in Furnas reservoir, Minas Gerais, Brazil
Provedor de dados: 104
Autores: Santos,José Enemir dos; Bazzoli,Nilo; Rizzo,Elizete; Santos,Gilmar Bastos.
The reproductive biology of Iheringichthys labrosus (Lütken, 1874) was studied in Furnas reservoir, Minas Gerais, Brazil. The fishes, 323 males and 817 females, were captured bimonthly from August 1993 to July 1994 by using gill nets with 3-10 cm mesh size. Gonadal maturation of the specimens was analyzed through macro and microscopical characteristics of the gonads. The secretory activity of the tubules of the caudal region of the testis was analyzed during the maturational testicular cycle. Females and males were in reproductive activity throughout the year in the reservoir. The peak of advanced maturation/mature stages occurred from October to January and of spawned/spent from February to May. The spawning of I. labrosus was identified as fractional or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gonadal maturation; Pimelodidae; Spawning.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752004000200006

Morfologia e desenvolvimento do núcleo vitelínico do lambari Astyanax bimaculatus (Linnaeus, 1758) (Osteichthyes, Characidae)
Provedor de dados: 104
Autores: Cangussu-Mariani,Silvia Dantas; Rizzo,Elizete; Bazzoli,Nilo.
A morphological study of the yolk nucleus in previtellogenic oocytes from A. bimacularus has been carried out. Six phases of development were described from its formation closed to the oocyte nucleus to its dispersion in the periferic ooplasm. Histochemical techniques indicate proteins, lipids and RNA in the yolk nucleus of A. bimaculatus, but there are no carbohydrate in this structure. The origin and functional activity of the teleost yolk nucleus are discussed.
Tipo: Info:eu-repo/semantics/article
Ano: 1990
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751990000300001

Embriogenesis and larval ontogeny of the "piau-gordura", Leporinus piau (Fowler) (Pisces, Anostomidae) after induced spawning
Provedor de dados: 104
Autores: Borçato,Fábio Luiz; Bazzoli,Nilo; Sato,Yoshimi.
Mature males and females of Leporinus piau (Fowler, 1941) were induced to reproduce through a hypophysation process. Extrusion occurred 12 h or 312 hours-degree after the hypophysation, at a water temperature of 26°C. Fertilized eggs were maintained in incubators at 24°C. Embryonic development, was evaluated using every 10 minutes, fresh egg samples which were analyzed under stereoscopic microscope. The larvae were collected at 24-hour intervals for seven days after hatching, fixed in Bouin's fluid and were submitted to routine histological techniques. The eggs of L. piau were slightly gray, non-adhesive and round-shaped. After 1.5 h the embryo was at the 64-blastomere phase and showed a wide yolk region on the vegetative pole. Within 6.25 h, blastopore...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Embryo; Induced spawn; Teleost fish.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752004000100019

Bioaccumulation of mercury, cadmium, zinc, chromium, and lead in muscle, liver, and spleen tissues of a large commercially valuable catfish species from Brazil
Provedor de dados: 42
Autores: Arantes,Fábio P.; Savassi,Lourenço A.; Santos,Hélio B.; Gomes,Marcos V.T.; Bazzoli,Nilo.
The increasing amounts of heavy metals entering aquatic environments can result in high accumulation levels of these contaminants in fish and their consumers, which pose a serious risk to ecosystems and human health. We investigated the concentrations of mercury (Hg), cadmium (Cd), zinc (Zn), chromium (Cr), and lead (Pb) in muscle, liver, and spleen tissues of Pseudoplatystoma corruscans specimens collected from two sites on the Paraopeba River, Brazil. The level of heavy metals concentrations in the tissues was often higher in viscera (i.e. liver and spleen) than in muscle, and thus, the viscera should not be considered for human consumption. Correlations between metal concentrations and fish size were not significant. Although the levels of muscle...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Contamination; Freshwater fish; Heavy metal; Human health.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000100137

The influence of a large reservoir on the reproductive activity of the white piranha, Serrasalmus brandtii (Lütken, 1875) in Southeast Brazil
Provedor de dados: 49
Autores: 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

Morphology of gonads, maturity and spawning season of Loricariichthys spixii (Siluriformes, Loricariidae) in a Subtropical Reservoir
Provedor de dados: 52
Autores: Duarte,Silvana; Araújo,Francisco Gerson; Sales,Armando; Bazzoli,Nilo.
The gonad morphology and spawning season of Loricariichthys spixii in Lajes reservoir were described based on 175 males and 613 females. Cells from the spermatogenic lineage were divided in four phases: spermatogonia (primary and secondary), spermatocytes (primary and secondary), spermatids and spermatozoa, and the cells from the ovocitarian lineage were divided in four phases: primary oocytes (O1), previtellogenic oocytes (O2), cortical vesicle oocytes (O3) and yolk globules or vitellogenic (O4). Five gonadal stages were described for the males/females according to oocytes and spermatogenic lineage cells distribution: resting (1); initial maturation (2a); advanced maturation (2b); partially spent/spawned (4a); totally spent/spawned (4b). Spawning was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Loricariidae; Reservoir; Fish reproduction; Gonad morphology; Brazil.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000700013

Oocyte surface in four teleost fish species postspawning and fertilization
Provedor de dados: 52
Autores: Rizzo,Elizete; Moura,Thais F.C.; Sato,Yoshimi; Bazzoli,Nilo.
Cytological and cytochemical studies were carried out to investigate the surface characteristics of oocytes of four teleost species from the São Francisco river. The fishes were submitted to hypophysation at the Três Marias Hybrobiology and Fishculture Station, Minas Gerais, Brazil, in January 1996. Postspawning, oocytes of the curimatãs Prochilodus affinis, Prochilodus marggravii and dourado Salminus brasiliensis were surrounded by a thick, three-layered zona pellucida with radial striae. The surface of spawned oocytes of the surubim, Pseudoplatystoma coruscans, was comprised of mucous coat located externally to a thin, two-layered and striated zona pellucida. Oocyte activation during fertilization, lead to cortical reaction, formation of a perivitelline...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zona pellucida; Oocyte surface; Mucous coat; Teleost; Micropyle.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000100005

Growth hormone on ovarian morphology of lambaris (Astyanax bimaculatus) after induced spawning
Provedor de dados: 65
Autores: 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