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A systematic review of diapoma (teleostei: characiformes: characidae: stevardiinae: diapomini) with descriptions of two new species from southern Brazil Pap. Avulsos de Zool. (São Paulo)
Menezes,Naércio A.; Weitzman,Stanley H..
Diapoma is reviewed and four species are recognized: (1) Diapoma thauma, new species, from streams of the rio Jacuí basin, state of Rio Grande do Sul; (2) D. pyrrhopteryx, new species collected from the rio Canoas and streams flowing into this basin in the states of Rio Grande do Sul and Santa Catarina, Brazil; (3) Diapoma terofali, from streams flowing into rio Uruguay in Uruguay and Rio Grande do Sul, Brazil and streams flowing into rio de la Plata, Argentina; and (4) Diapoma speculiferum, from lowland coastal streams in Rio Grande do Sul, Brazil and Uruguay. Diapoma pyrrhopteryx possess the posteroventral opercular elongation typical of D. speculiferum, type species of the genus, but which is absent in D. thauma and D. terofali. Nonetheless, all the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Taxonomy; New species; Characidae; Diapoma.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492011000500001
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Age, growth, mortality and yield per recruit of the dourado Salminus brasiliensis, Corumbá Reservoir, Goiás State, Brazil Neotropical Ichthyology
Tos,Claudenice Dei; Gomes,Luiz Carlos; Agostinho,Angelo Antônio; Batista,Rosana Paulo.
In order to evaluate the fate of the migratory species dourado Salminus brasiliensis in the first years of impoundment in Corumbá Reservoir we estimated age, growth, mortality and yield per recruit. Samplings were carried out monthly in Corumbá Reservoir and its main tributaries (Goiás State) from March 1998 to February 1999 using gillnets. After one year of impoundment, age was estimated from scales and the maximum number of rings was six for males and five for females. Rings are formed annually in May and June. The asymptotic length and growth rate for males and females were 37.1 cm and 0.77 and 56.6 cm and 0.52, respectively. A dominance of juveniles was verified in the reservoir and its tributaries. The instantaneous total mortality rate (Z) was 1.59...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Growth model; Mortality; Fishery yield; Dam; Characidae.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000200014
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Astyanax vermilion and Astyanax burgerai: new characid fishes (Ostariophysi: Characiformes) from Northeastern Bahia, Brazil Neotropical Ichthyology
Zanata,Angela M.; Camelier,Priscila.
Two new Astyanax species, A. vermilion, from rio Almada and rio Cachoeira, and A. burgerai, from rio Almada, Bahia State, Brazil, are described. Astyanax vermilion is distinguished from most of its congeners and from all other Astyanax species known from northeastern Brazilian drainages by having distal portion of pelvic fins dark, a combination of sexually dimorphic characters, posteroventral portion of body and fins (except pectoral) reddish in life, and inconspicuous humeral and caudal spots. It also differs by having highest body depth just anterior of dorsal-fin origin, 32-34 lateral-line scales, and presence of one or two maxillary teeth. Astyanax burgerai is diagnosed by the presence of two vertically elongated humeral blotches, absence of a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: New species; Sexual dimorphism; Coastal drainages; Characidae.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000200007
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B chromosomes in a population of Astyanax eigenmanniorum (Characiformes, Characidae) from the Araguari River Basin (Uberlândia, MG, Brazil) Genet. Mol. Biol.
Torres-Mariano,Alessandra Ribeiro; Morelli,Sandra.
A cytogenetic study was conducted on an Astyanax eigenmanniorum population from the Caetano Stream (18° 44' 56" S/ 048° 18' 39" W) - in Uberlândia, MG, Brazil - showing a modal diploid number of 48 chromosomes in the standard male and female karyotypes. However, in several specimens it was also possible to observe metaphases with one or two B chromosomes, increasing the diploid number to 49 or 50 chromosomes, respectively. The supernumerary chromosomes were totally heterochromatic and highlighted after C-banding. The silver-stained nucleolus organizing regions (Ag-NORs) were located in at least five chromosomes of the standard karyotype, thus characterizing a multiple NOR system in the species. This is the first occurrence of an A. eigenmanniorum...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Characidae; Astyanax eigenmanniorum; Supernumerary chromosome; Heterochromatin; Nucleolus organizing regions (NORs).
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200015
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Biologia reprodutiva de Astyanax scabripinnis paranae (Eigenmann) (Ostheichthyes, Characidae), do ribeirão das Marrecas, bacia do rio Tibagi, Paraná Zoologia
Veregue,Angela Maria Louzada; Orsi,Mário Luís.
Some aspects of the reproductive cycle of female "lambari", Astyanax scabripinnis paranae (Eigenmann, 1927) were studied. The specimens were collected in intervals of fifteen days, from September 1979, until November 1980, in the Marrecas creek (Irerê and Paiquerê districts), Londrina, Paraná, Brazil. The maturity scale was characterized in five stages: immature, maturation, spawning, spent, and resting, which was established by the gonad-somatic relation and the ovary morphology and microscopic aspects. The maturation curve and distribution of maturity stages show that the period of reproduction is very long; spawning extended from July to March. The gonad cycle is related to seasons: maturation occurs chiefly in the winter months, spawning specimens are...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Astyanax scabripinnis; Characidae; Biology; Reproduction; Tibagi river.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752003000100012
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Características hematológicas do tambaqui Colossoma macropomum Cuvier (Osteichthyes, Characidae) em sistema de monocultivo intensivo: II. Leucócitos Zoologia
Tavares-Dias,Marcos; Sandrim,Elziane F. Silva; Campos-Filho,Eugênio de.
The leukocytes parameters in approximately one-year-old freshwater fish Colossoma macropomum Cuvier, 1818 (tambaqui) kept in an intensive monobreeding system as well as the correlation among these parameters and the biometric data (total weight and standard length) were investigated. The mean value of the white blood cell count (WBC) in the peripheral blood of tambaqui was 2663.3±1288µl and in the differential count, the following means were observed: neutrophils (1566.2±754µl); lymphocytes (973.6±447µl); monocytes (86.7±123µl) and special granulocitic cells (7.8±144µl). The blood parameters studied were positively correlated among one another, but were negatively correlated with the standard length. However, no correlation was with the weigth of the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Characidae; Colossoma macropomum; Freshwater fish; Leukocytes; Tambaqui.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000100012
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Comentários sobre a distribuição geográfica de Astyanax altiparanae Garutti & Britski, 2000 (Osteichthyes, Characidae) na bacia do rio Iguaçu Biological Sciences
Graça, Weferson Júnio da; UEM; Pavanelli, Carla Simone; UEM.
Garutti (1995) fez a revisão de algumas espécies de Astyanax (Osteichthyes, Characidae) e aquela, conhecida como “tambiú” na bacia do alto rio Paraná, anteriormente identificada como Astyanax bimaculatus, foi considerada nova e posteriormente descrita por Garutti & Britski (2000) como Astyanax altiparanae (Pisces, Characiformes). Naquela oportunidade, entretanto, não foram analisados exemplares da bacia do rio Iguaçu. Esse afluente do rio Paraná apresenta um alto grau de endemismo em sua ictiofauna devido ao isolamento geográfico causado pelas cataratas situadas próximo à sua foz. No entanto, muitas dúvidas relacionadas ao status específico da população da bacia do Iguaçu, também chamada de A. bimaculatus antes dos trabalhos de Garutti, permaneceram....
Palavras-chave: 2.00.00.00-6 Ciências Biológicas Astyanax altiparanae; Distribuição geográfica; Rio Iguaçu; Bacia do alto rio Paraná; Characidae; Tetragonopterinae 2.00.00.00-6 Ciências Biológicas.
Ano: 2002 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/2319
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Cultivo de matrinxã Brycon orthotaenia (Günther, 1864) em tanques-rede, em diferentes densidades de estocagem - DOI: 10.4025/actascibiolsci.v32i1.3687 Biological Sciences
Pedreira, Marcelo Mattos; UFVJM; Sampaio, Edson Vieira; CODEVASF - Três Marias; Santos, José Cláudio Epaminondas dos; CODEVASF - Três Marias; Luz, Ronald Kennedy; UFMG.
O presente experimento avaliou o desempenho e sobrevivência de juvenis de matrinxã Brycon orthotaenia cultivados em tanques-rede de 4 m3, por 197 dias, em três densidades de estocagem: 20, 40 e 60 peixes m-3. Foram utilizados exemplares com 19,9 ± 0,3 cm de comprimento total e 90,0 ± 0,15 g de peso. Os animais foram alimentados com ração extrusada contendo 36% de proteína bruta. O comprimento total e o peso foram superiores (p < 0,05) na densidade de 20 peixes m-3. Valores intermediários e inferiores foram registrados para a densidade de 40 e 60 peixes m-3, respectivamente. A sobrevivência e o Fator de condição de Fulton foram semelhantes (p > 0,05) entre as diferentes densidades; porém, a biomassa produzida foi superior (p < 0,05)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: 2.00.00.00-6 Ciências Biológicas rio São Francisco; Characidae; Tanques-rede; Espécie neotropical; Matrinxã 5.06.03.00-0 São Francisco river; Characidae; Floating Cage; Neotropical fish; Matrinxã.
Ano: 2009 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/3687
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Descrição de Astyanax argyrimarginatus sp. n. (Characiformes, Characidae) procedente da bacia do Rio Araguaia, Brasil BJB
GARUTTI,V..
Descreve-se uma espécie nova para o gênero Astyanax Baird & Girard. A. argyrimarginatus procede da bacia do Rio Araguaia, Brasil. Esta espécie pode ser identificada por possuir uma mancha umeral negra horizontalmente ovalada, uma mancha negra no pedúnculo caudal, que se estende à extremidade dos raios caudais medianos, duas barras verticais castanho-escuras na região umeral e uma faixa lateral negra conspícua, bordeada por uma estreita faixa prateada. São discutidos outros caracteres que distinguem a espécie nova das demais espécies do gênero Astyanax portadoras de uma mancha umeral horizontalmente ovalada.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Astyanax argyrimarginatus sp. n.; Characidae; Tetragonopterinae; Taxonomia; Descrição; Rio Araguaia; Brasil.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000400008
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Dinâmica reprodutiva de Oligosarcus jenynsii e O. robustus (Characiformes, Characidae) na lagoa Fortaleza, Rio Grande do Sul, Brasil Iheringia, Sér. Zool.
Nunes,Daniela M.; Pellanda,Mateus; Hartz,Sandra Maria.
Oligosarcus jenynsii (Günther, 1864) and O. robustus Menezes, 1969 are fish species distributed in Rio Grande do Sul, Brazil, Uruguay, and northern Argentina. The reproductive period and recruitment, sex ratio, absolute and relative fecundity, and body length at first gonadal maturation of the two carnivorous species from Fortaleza Lagoon were analized. The specimens were sampled monthly, from May 2000 to April 2001, with fishing effort of 24 hours/month, using stationary gillnets of different mesh sizes and seine net (three samples per edge). The records of each individual included total length, total weight, gonad weight, sex and gonadal maturity stage. The reproductive period of both O. jenynsii and O. robustus ranges from May/June to November/December,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Oligosarcus; Reproduction; Characidae; Southern Brazil.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212004000100001
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Dynamics and cytochemistry of oogenesis in Astyanax fasciatus (Cuvier) (Teleostei, Characiformes, Characidae) from Rio Sapucaí, Minas Gerais State, Brazil Zoologia
Garcia,José Antônio Dias; Chini,Helena A.S.; Maistro,Edson Luis; Quagio-Grassiotto,Irani.
Oogenesis involves a set of transformations which are undergone by female germ cells These cells change into oogonias and then into mature oocytes. Sexually mature female fish were collected monthly, during one year, from the Sapucaí River, a tributary of the Rio Grande, which is part of the Furnas Reservoir in the state of Minas Gerais. During the several stages of maturation, we observed small round oogonias with a large nucleus, a single nucleolus, and weakly stained cytoplasm with eosinophilic granules. The primary oocytes showed a large basophilic nucleus, with a developed peripheral nucleolus and a reduced cytoplasm. The previtellogenic oocytes presented voluminous cytoplasm and nucleus with several small peripheral nucleoli. The oocytes underwent...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Teleostei; Characidae; Astyanax fasciatus; Oogenesis; Cytochemical.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000400003
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Effectiveness of estradiol valerate on sex reversion in Astyanax altiparanae (Characiformes, Characidae) BABT
Bem,Jaqueline Cristina de; Fontanetti,Carmem Silvia; Senhorini,José Augusto; Parise-Maltempi,Patricia Pasquali.
The objective of this study was to evaluate the effectiveness of estradiol valerate in an attempt to feminize the male Astyanax altiparanae. One thousand newly-hatched larvae were randomly distributed in four incubators. During a period of 30 days, estradiol valerate was administered in different dosages (20, 40, and 80 mg/kg of diet); the control group did not receive hormone in the diet. After 161 days of hatching, biometry was performed on 50 fishes per treatment group, and the gonads were analyzed. The hormone treatments were effective in feminizing A. altiparanae, achieving 70-76% of the desired sex, while the control treatment had 44% females. The hormone did not affect the growth of fish.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Astyanax altiparanae; Characidae; Feminization; Sex Reversion; Estrogen.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000200015
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Estrutura fina do espermatozóide de Acestrorhynchus falcatus Bloch (Teleostei, Characidae) da região norte do Brasil Zoologia
Matos,Edilson; Matos,Patricia; Corral,Laura; Azevedo,Carlos.
Spermatozoa of amazon fish, Acestrorhynchus falcatus Bloch, 1794 were investigated by optical microscopy (DIC) and electron microscopy (TEM). Spermatozoa have no acrosome, the head is ovoid, and the midpiece region cylindrical, contains spherical mitochondria. The centriolar complex is located at the lateral side of the nucleus, formed by nine peripheral pairs of microtubules and arranged in a right angle to each other. The flagellum consists of nine pairs of peripheral and two central microtubules.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Teleostei; Characidae; Acestrorhynchus falcatus; Ultrastructure; Spermatozoon.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752000000300019
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Feeding ecology of Serrapinnus notomelas (Characiformes: Cheirodontinae) in small forest streams in the Machado River basin, Rondônia, Brazil Acta Amazonica
COSTA,Igor David da; ROCHA,Vanessa Martins da.
ABSTRACT Studies on the trophic structure of fish give information on species autoecology and their role in the ecosystem. The aims of this study were to characterize the diet of Serrapinnus notomelas in small streams of the River Machado basin and to assess the effect of rainfall seasonality. Fish were collected bimonthly from July 2013 to May 2014 with seine nets and hand nets. The length of each specimen was measured to identify category classes. There were also measured the fullness index and volume of each ingested item, and these data were combined to obtain an alimentary index. We used ANOVA and Kruskal-Wallis to test for differences between length classes and fullness index, Chi-squared tests to detect seasonal differences in origin of food items...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Characidae; Trophic ecology; Igarapés; Ornamental fish; Amazon.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672017000100019
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Feeding of Acestrorhynchus lacustris (Characidae): a post impoundment studies on Itaipu reservoir, upper Paraná River, PR BABT
Hahn,Norma Segatti; Delariva,Rosilene Luciana; Loureiro,Valdirene Esgarbosa.
With objective to know feeding spectrum of Acestrorhynchus lacustris (Reinhardt, 1874), a middle size predator in different places of influence area of Itaipu reservoir, stomach contents were analyzed. Samples were collected from March 1984 to February 1989 from Itaipu Reservoir and its adjacent areas. Its fed mainly on fishes, but it was an opportunistic (consumed 17 species of prey). Despite of the wide feeding spectrum, few preys were dominant in the diet, according to the different habitats sampled. As a result, it significant spatial differences in the diet was observed. Was observed through "Detrented Correspondence Analysis" (DCA) these were divided into three groups in relation with diet: preys from upstream, with higher scores; preys from the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Feeding; Predation; Characidae; Upper Paraná River; Itaipu Reservoir.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000200010
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Fishes community composition and patterns of species distribution in Neotropical streams Biota Neotropica
Cavalheiro,Laísa Wociechoski; Fialho,Clarice Bernhardt.
Abstract: The ichthyofauna of streams in the Neotropical region is not yet fully known. This study aims to investigate the ichthyofauna composition of six streams of the Ijuí River sub-basin, Rio Grande do Sul State, inserted in the Uruguay River basin, as to contribute to the knowledge of fishes species richness and distribution in the south of Brazil. Sampling was carried out between July 2015 and May 2016, bimonthly, using the technique of electric fishing to collect the fishes. Spatial variations (per sampled stream) in the ichthyofauna composition were tested with a permutational multivariate analysis of variance. In total, we collected 5,029 individuals from 55 species, 13 families and five orders. From these species, 17 are endemic to the Uruguay...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Abundance; Characidae; Heptapteridae; Loricariidae; Richness; Uruguay River basin.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032020000100302
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Habitat and community structure modulate fish interactions in a neotropical clearwater river Neotropical Ichthyology
Nunes,Lucas T.; Morais,Renato A.; Longo,Guilherme O.; Sabino,José; Floeter,Sergio R..
ABSTRACT Species interactions can modulate the diversity and enhance the stability of biological communities in aquatic ecosystems. Despite previous efforts to describe fish interactions in tropical rivers, the role of habitat characteristics, community structure, and trophic traits over these interactions is still poorly understood. To investigate among-habitat variation in substratum feeding pressure and agonistic interactions between fishes, we used remote underwater videos in three habitats of a clearwater river in the Central Western, Brazil. We also performed visual surveys to estimate the abundance and biomass of fishes and proposed a trophic classification to understand how these variables can affect fish interactions. Community structure was the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bodoquena plateau; Centrality; Characidae; Feeding pressure; Habitat heterogeneity.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000100217
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How does diet influence the reproductive seasonality of tropical freshwater fish?: A case study of a characin in a tropical mountain river Neotropical Ichthyology
Ballesteros,Tania M.; Torres-Mejia,Mauricio; Ramírez-Pinilla,Martha P..
Seasonal breeding of tropical freshwater fish may be synchronized with periods of high food consumption. We explored this hypothesis by studying the relationship between diet and reproductive activity of Creagrutus guanes (Teleostei, Characidae). Our results showed that C. guanes had a generalist and omnivorous diet dominated by aquatic insects (mainly Diptera larvae) and seeds. Creagrutus guanes did not show intersexual or ontogenetic variation in diet. Peaks of feeding activity during rainy months were not synchronized with breeding in dry months. Our results do not support the hypothesis that the reproductive season has to be synchronized with high food consumption. We discussed the hypothesis fat reserves may be an important factor for the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Feeding ecology; Phenology; Characidae; Fat reserves; Breeding; Creagrutus guanes.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400019
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Hyphessobrycon brumado: a new characid fish (Ostariophysi: Characiformes) from the upper rio de Contas drainage, Chapada Diamantina, Bahia, Brazil Neotropical Ichthyology
Zanata,Angela M.; Camelier,Priscila.
A new species of Hyphessobrycon Ellis is described from tributaries of the upper rio de Contas, Bahia, Brazil. The new species can be diagnosed from its congeners by having low body depth, a broad black stripe along lateral of body that extends weakly through median caudal-fin rays, absence of humeral spot and orange- to reddish life coloration.
Tipo: Info:eu-repo/semantics/article Palavras-chave: New species; Characidae; Neotropical; Northeastern Brazil; Headwaters.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000400006
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Induced reproduction in a migratory teleost species by water level drawdown Neotropical Ichthyology
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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