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1.
Acta sci., Biol. sci ; 43: e56235, 2021. map, ilus, graf
Artigo em Inglês | LILACS, VETINDEX | ID: biblio-1461010

Resumo

After the formation of Itaipu Reservoir, the invader Trachelyopterus galeatus colonized the upper Paraná River. Light microscopy was used to describe gametogenesis and the reproductive phases of females and males. The following data were verified: diameter of the oocytes, spawning type, batch fecundity by ovary weight, standard length, and total weight of the fish, along with the regions where this species reproduced in the upper Paraná River floodplain. A total of 470 specimens were collected quarterly in 2016, 2018 and 2019, and bimonthly in 2017. The gonads were fixed in a Karnovsky solution, dehydrated, infiltrated, and embedded in historesin. The histological slides were stained using PAS + iron hematoxylin + metanil yellow, analyzed and photographed under an image-capturing microscope. As regards diameter of the oocytes and fecundity estimates, ovaries whose oocytes were measured under a stereomicroscope were sampled. In the oogenesis, undifferentiated and differentiated oogonia, early primary growth oocytes, secondary growth oocytes, full-grown oocytes and maturing oocytes were recorded. In the spermatogenesis, primary and secondary spermatogonia, primary and secondary spermatocytes, spermatids and spermatozoa were recorded. The reproductive phases found for females and males were: immature, early development, late development, spawning/sperm-releasing capable, regression, and regeneration. Trachelyopterus galeatus prefers to occupy and reproduce in the Ventura, Patos, Guaraná, Fechada, Garças, and Pau Véio lagoons. The diameter of the oocytes varied from 0.4 to 2.9 mm. Females spawn, on average, 113 oocytes per batch. Batch fecundity variation shows that the larger the ovary, standard length, and total weight, the larger the number of oocytes to be spawned. This invader possesses reproductive success in the upper Paraná River floodplain, especially in lagoons.


Assuntos
Animais , Espermatogênese , Fertilidade , Inseminação , Peixes-Gato/crescimento & desenvolvimento , Peixes-Gato/embriologia , Reprodução
2.
Acta Sci. Biol. Sci. ; 43: e56235, 2021. mapas, ilus, graf
Artigo em Inglês | VETINDEX | ID: vti-764619

Resumo

After the formation of Itaipu Reservoir, the invader Trachelyopterus galeatus colonized the upper Paraná River. Light microscopy was used to describe gametogenesis and the reproductive phases of females and males. The following data were verified: diameter of the oocytes, spawning type, batch fecundity by ovary weight, standard length, and total weight of the fish, along with the regions where this species reproduced in the upper Paraná River floodplain. A total of 470 specimens were collected quarterly in 2016, 2018 and 2019, and bimonthly in 2017. The gonads were fixed in a Karnovsky solution, dehydrated, infiltrated, and embedded in historesin. The histological slides were stained using PAS + iron hematoxylin + metanil yellow, analyzed and photographed under an image-capturing microscope. As regards diameter of the oocytes and fecundity estimates, ovaries whose oocytes were measured under a stereomicroscope were sampled. In the oogenesis, undifferentiated and differentiated oogonia, early primary growth oocytes, secondary growth oocytes, full-grown oocytes and maturing oocytes were recorded. In the spermatogenesis, primary and secondary spermatogonia, primary and secondary spermatocytes, spermatids and spermatozoa were recorded. The reproductive phases found for females and males were: immature, early development, late development, spawning/sperm-releasing capable, regression, and regeneration. Trachelyopterus galeatus prefers to occupy and reproduce in the Ventura, Patos, Guaraná, Fechada, Garças, and Pau Véio lagoons. The diameter of the oocytes varied from 0.4 to 2.9 mm. Females spawn, on average, 113 oocytes per batch. Batch fecundity variation shows that the larger the ovary, standard length, and total weight, the larger the number of oocytes to be spawned. This invader possesses reproductive success in the upper Paraná River floodplain, especially in lagoons.(AU)


Assuntos
Animais , Peixes-Gato/embriologia , Peixes-Gato/crescimento & desenvolvimento , Inseminação , Reprodução , Fertilidade , Espermatogênese
3.
Neotrop. ichthyol ; 16(4)out. 2018. mapas, ilus, graf, tab
Artigo em Inglês | LILACS, VETINDEX | ID: biblio-964160

Resumo

Here we choose the sábalo Prochilodus lineatus, to answer the following questions: How the otolith length and weight are correlated to fish measurements (length and weight)? How reliable are the otoliths measurements to predict the length and age of P. lineatus? Finally, we propose predictive equations of the length and weight of the fish using length and weight of the otolith. The otoliths were sampled from individuals collected in the Upper Paraná River floodplain during 2012 and 2013 years. The relationships among the otolith measurements and both length and weight of the fish were performed using linear regressions. To test whether the length and weight of the otolith differ between the sampled sites, Variance Analysis was performed. Finally, we made analysis of Kruskal-Wallis to verify if the measurements obtained through the otoliths could be used to distinguish the age of the fish. We demonstrate that the length and weight of the otolith are good proxies to predict the length and weight of the fish. Although some ages were statistically different, this result does not support the idea that the age of the fish can be accurately inferred only using otolith measures.(AU)


Neste trabalho o curimba Prochilodus lineatus foi utilizado para responder as seguintes questões: Como o comprimento e o peso dos otólitos são correlacionados com o comprimento e o peso do peixe? Até que ponto as medidas dos otólitos são confiáveis para predizer a idade do P. lineatus? Finalmente, nós propomos equações preditivas do comprimento e peso do peixe utilizando o comprimento e o peso do otólito. Os otólitos foram amostrados de indivíduos coletados na planície de inundação do alto rio Paraná durante os anos de 2012 e 2013. As relações entre as medidas dos otólitos e o peso e comprimento do peixe foram verificadas utilizando regressões lineares. Para testar se o comprimento e o peso do otólito diferem entre locais foram utilizadas Análises de Variância e para testar se as medidas dos otólitos são suficientes para distinguir as idades foram utilizados testes de Kruskal-Wallis. Nós demonstramos que o comprimento e o peso do otólito são bons preditores do comprimento e peso do peixe. Embora algumas idades foram estatisticamente diferentes entre as medidas dos otólitos, esse resultado não suporta a ideia de que a idade do peixe pode ser inferida de forma acurada somente utilizando as medidas dos otólitos.(AU)


Assuntos
Animais , Peso Corporal , Membrana dos Otólitos/anatomia & histologia , Caraciformes/anatomia & histologia , Grupos Etários
4.
Neotrop. ichthyol ; 16(4): e180094, out. 2018. mapas, ilus, graf, tab
Artigo em Inglês | VETINDEX | ID: vti-17297

Resumo

Here we choose the sábalo Prochilodus lineatus, to answer the following questions: How the otolith length and weight are correlated to fish measurements (length and weight)? How reliable are the otoliths measurements to predict the length and age of P. lineatus? Finally, we propose predictive equations of the length and weight of the fish using length and weight of the otolith. The otoliths were sampled from individuals collected in the Upper Paraná River floodplain during 2012 and 2013 years. The relationships among the otolith measurements and both length and weight of the fish were performed using linear regressions. To test whether the length and weight of the otolith differ between the sampled sites, Variance Analysis was performed. Finally, we made analysis of Kruskal-Wallis to verify if the measurements obtained through the otoliths could be used to distinguish the age of the fish. We demonstrate that the length and weight of the otolith are good proxies to predict the length and weight of the fish. Although some ages were statistically different, this result does not support the idea that the age of the fish can be accurately inferred only using otolith measures.(AU)


Neste trabalho o curimba Prochilodus lineatus foi utilizado para responder as seguintes questões: Como o comprimento e o peso dos otólitos são correlacionados com o comprimento e o peso do peixe? Até que ponto as medidas dos otólitos são confiáveis para predizer a idade do P. lineatus? Finalmente, nós propomos equações preditivas do comprimento e peso do peixe utilizando o comprimento e o peso do otólito. Os otólitos foram amostrados de indivíduos coletados na planície de inundação do alto rio Paraná durante os anos de 2012 e 2013. As relações entre as medidas dos otólitos e o peso e comprimento do peixe foram verificadas utilizando regressões lineares. Para testar se o comprimento e o peso do otólito diferem entre locais foram utilizadas Análises de Variância e para testar se as medidas dos otólitos são suficientes para distinguir as idades foram utilizados testes de Kruskal-Wallis. Nós demonstramos que o comprimento e o peso do otólito são bons preditores do comprimento e peso do peixe. Embora algumas idades foram estatisticamente diferentes entre as medidas dos otólitos, esse resultado não suporta a ideia de que a idade do peixe pode ser inferida de forma acurada somente utilizando as medidas dos otólitos.(AU)


Assuntos
Animais , Peso Corporal , Membrana dos Otólitos/anatomia & histologia , Caraciformes/anatomia & histologia , Grupos Etários
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