Biologia reprodutiva de Oligosarcus jenynsii (Günther) (Characiformes, Characidae) da Lagoa das Custódias, Tramandaí, Rio Grande do Sul, Brasil

Fialho, Clarice Bernhardt; Schifino, Lúcia Cabral; Verani, José Roberto

doi:10.1590/s0101-81751998000300020

Cited by 14 publications

(26 citation statements)

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“…In O. hepsetus, the GSI increases from the resting to the maturing class, reaching a peak in mature testes, followed by a decreasing trend to the spent class, which is the expected pattern for teleostean fishes (Teles & Godinho, 1997). A similar GSI pattern was found by Fialho et al (1998) (Fialho et al, 1998), where food and habitat availability are usually high and environmental conditions are more stable. Overall, the testis morphology and maturity development class of O. hepsetus in the Lajes reservoir did not differ significantly from those of closely related species in other lentic environments.…”

Section: Discussionsupporting

confidence: 76%

“…Using solely macroscopic techniques, Hartz et al (1997) recorded four testis maturity classes for the gonadal development of Oligosarcus jenynsii in the Caconde Lagoon in Rio Grande do Sul, but found no immature or resting stages. Fialho et al (1998) described five maturity classes for O. jenynsii in the Custódia Lagoon, Rio Grande do Sul, but no resting stage.…”

Section: Discussionmentioning

confidence: 99%

“…Hartz et al (1997) and Fialho et al (1998) studied some aspects of the reproduction of this genus, but they made no histological analysis to propose maturity classes for gonadal development. Thus, the majority of researches on fish reproduction have focused on the female, in which gamete production is more costly than in the male (Tomasini & Laugier, 2002).…”

Section: Introductionmentioning

confidence: 99%

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Testicular maturation of Oligosarcus hepsetus (Cuvier) (Actinopterygii, Characidae) in a brazilian tropical reservoir

et al. 2006

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Six reproductive classes of male Oligosarcus hepsetus (Cuvier, 1829), a medium-sized carnivorous Characiform species, are described based on macroscopic and histological techniques. A total of 175 individuals were caught monthly between April 2001 and June 2002 in the Lajes Reservoir, Brazil, one of the largest impoundment areas in the state of Rio de Janeiro. The reproductive classes were based upon changes in the testicular morphology and stages of germinative cells, i.e., resting, early maturing, late maturing, mature, partially spent and totally spent. Fish in the resting class showed testes with spermatogonia and spermatocytes along the wall of seminal lobules, while spermatids were present in the lumina of the lobules. During early maturing, active spermatogenesis occurs throughout the testis; in the late maturing and mature classes, the lobules are swollen with sperm that are typical of fish in breeding condition. Spent testes presented seminal lobules with residual spermatozoa, coinciding with decreasing GSI and greatly reduced sperm production. Overall, the testicular morphology and class of maturity development of O. hepsetus in the Lajes reservoir did not differ significantly from those of closely related species in other lentic environments. Lower GSI values in the oligotrophic Lajes reservoir than in other eutrophic natural lakes suggest that this species may be modifying this aspect of its reproductive strategy in response to the artificial environment.Keywords: Characiforms, reproduction, reservoirs, spermatogenesis, testis. RESUMO Maturação testicular de

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Section: Discussionsupporting

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Testicular maturation of Oligosarcus hepsetus (Cuvier) (Actinopterygii, Characidae) in a brazilian tropical reservoir

et al. 2006

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“…Vazzoler (1996) aponta que o período reprodutivo das espécies piscívoras geralmente antecede o das demais espécies do sistema, provavelmente para que suas larvas já estejam mais desenvolvidas e tenham maior possibilidade de predar as larvas das demais espécies quando estas eclodirem. Por um lado, as desovas precoces garantem o alimento para os juvenis, porém, por outro podem aumentar a mortalidade de ovos e larvas devido às baixas temperaturas e demais condições adversas (Fialho et al 1998). Oligosarcus jenynsii, na lagoa da Custódia (RS) (Fialho et al 1998) de frequência de comprimento, condição essencial para que esse tipo de análise seja conduzida (Sparre & Venema 1997).…”

Section: Discussionunclassified

“…Estudos envolvendo aspectos reprodutivos de espécies do gênero são encontrados nos trabalhos de Neves et al (1995), Hartz et al (1997), Fialho et al (1998), Hermes-Silva et al (2004) e Nunes et al (2004). A dieta foi investigada por Hartz et al (1996) e Nunes & Hartz (2006); e o crescimento de Oligosarcus jenynsi por análise e contagem dos anéis etários Hartz & Barbieri (1995).…”

Section: Introductionunclassified

Crescimento e mortalidade de Oligosarcus hepsetus (Cuvier, 1829) (Characiformes, Characidae) no Parque Estadual da Serra do Mar, Núcleo Santa Virgínia, São Paulo, Brasil

et al. 2011

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Growth and mortality parameters were estimated for Oligosarcus hepsetus caught in the Serra do Mar State Park, Núcleo Santa Virginia. Monthly length frequencies distributions were analyzed with the ELEFAN method within the FISAT program, using the seasonal version of the Von Bertalanffy's growth curve. The instantaneous rate of natural mortality was calculated using the empirical formula proposed by Pauly. The estimated parameters were K = 0.72, L∞ = 23.3 cm, C = 0.3, Wp = 0.7 and M = 1.25. These parameters corroborate the characteristics of a predator species with long reproductive period, spawning parceled out without parental care, and that lives in a typical river of Atlantic forest. Estes parâmetros corroboram as características de uma espécie predadora com longo período reprodutivo, desova parcelada sem cuidado com a prole e que vive em um rio típico de Mata Atlântica. Palavras-chave: peixe-cachorro, espécie dulciaquícola neotropical, parâmetros populacionais, frequência de comprimento, Mata Atlântica.

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The mitochondrial gene COI reveals the origin of the introduction of Platanichthys platana (Regan, 1917) (Clupeiformes, Clupeidae) in a neotropical floodplain

et al. 2022

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The first records of Platanichthys platana in the upper Rio Paraná floodplain (URPF) date to 2012, but variations in the body length of specimens collected from this basin have since generated uncertainty about their identity and origin of introduction. This study aimed to genetically characterize populations of P. platana in different river basins, assess haplotype diversity, and determine the origin of the introduced population in the URPF. Sequences from the COI region were used to calculate genetic distances, construct gene trees, and identify haplotype networks. Eight haplotypes were found, several of which were exclusive to the coastal basins of Santa Catarina and Rio Grande do Sul, and the Río Negro basin (Río Yí). The Río de La Plata and Mar Chiquita basins, and upper Rio Paraná floodplain shared haplotypes. Based on the results of our analysis, we concluded that the URPF specimens were introduced from populations in Argentina.

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Biologia reprodutiva de Oligosarcus jenynsii (Günther) (Characiformes, Characidae) da Lagoa das Custódias, Tramandaí, Rio Grande do Sul, Brasil

Cited by 14 publications

References 1 publication

Testicular maturation of Oligosarcus hepsetus (Cuvier) (Actinopterygii, Characidae) in a brazilian tropical reservoir

Testicular maturation of Oligosarcus hepsetus (Cuvier) (Actinopterygii, Characidae) in a brazilian tropical reservoir

Crescimento e mortalidade de Oligosarcus hepsetus (Cuvier, 1829) (Characiformes, Characidae) no Parque Estadual da Serra do Mar, Núcleo Santa Virgínia, São Paulo, Brasil

The mitochondrial gene COI reveals the origin of the introduction of Platanichthys platana (Regan, 1917) (Clupeiformes, Clupeidae) in a neotropical floodplain

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