Dinâmica reprodutiva de Oligosarcus jenynsii e O. robustus (Characiformes, Characidae) na lagoa Fortaleza, Rio Grande do Sul, Brasil

Nunes, Daniela Marques; Pellanda, Mateus; Hartz, Sandra Maria

doi:10.1590/s0073-47212004000100001

Cited by 14 publications

(10 citation statements)

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“…TThis value can be considered relatively high when compared to other species of peixecachorro with similar trophic and reproductive strategies, such as Oligosarcus jenynsii (17,684) studied in the Caconde lagoon of the Rio Grande do Sul State (Hartz et al, 1997). The same species, O. jenynsii, and another, O. robustus, studied in another lagoon of the Rio Grande do Sul, also presented lower average absolute fecundities of 14,483 and 16,308, respectively (Nunes et al, 2004). Fialho et al (1998), analyzing O. jenynsii in the Custódias Lagoon, also in the Rio Grande do Sul State, reported an average absolute fecundity of 9,694 oocytes.…”

Section: Discussionmentioning

confidence: 79%

Reproductive and feeding biology of Acestrorhynchus pantaneiro Menezes, 1992 (Osteichthyes: Acestrorhynchidae) in areas under the influence of dams in the upper Uruguay River, Brazil

Meurer

Zaniboni‐Filho²

2012

Neotrop. ichthyol.

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Reproductive and feeding biology of Acestrorhynchus pantaneiro Menezes, 1992 (Osteichthyes: Acestrorhynchidae) in areas under the influence of dams in the upper Uruguay River, Brazil Samira Meurer and Evoy Zaniboni-FilhoThe reproductive and feeding biology of Acestrorhynchus pantaneiro were studied in the upper Uruguay River, southern Brazil. Fourteen sites were surveyed seasonally between 2000 and 2006. A total of 3,427 fish were caught, being 2,015 females and 1,412 males. The sex ratio was 1.66:1 (female:male) in lentic habitats (p<0.05), but showed equal proportion in lotic and transition habitats. Feeding activity was similar for both sexes and showed little variation along the year. The analysis of stomach contents of 2,401 stomach showed that "fish" was the most consumed resource in all different habitats, corresponding to 99% of the food in the gravimetric analyzes. The species showed a multiple spawning type with a long reproductive period, although the highest intensity of reproduction occurred between the beginning of spring and summer, marked by the highest GSI and advanced gonadal maturity stages. Relative fecundity (mean ± SD) was 139 ± 56 oocytes per mm of total length and 152 ± 66 oocytes per gram of total weight. The mean absolute fecundity was 33,470 ± 19,151 oocytes and the average of the mature oocytes diameter was 897.5 ± 365.4 Pm. Acestrorhynchus pantaneiro is more abundant in lentic environments and presents biological characteristics that favor the establishment of the species in dammed rivers.A biologia reprodutiva e alimentar do peixe-cachorro Acestrorhynchus pantaneiro foi avaliada na região do alto rio Uruguai, sul do Brasil. Um total de 3.427 exemplares foram capturados, em 14 estações amostradas sazonalmente no período entre 2000 e 2006. Destes, 2.015 eram fêmeas e 1.412 machos. A proporção sexual nos ambientes lênticos foi de 1,66:1 (fêmeas:machos) (p<0,05), apresentando proporções semelhantes nos ambientes lóticos e de transição lótico-lêntico. A atividade alimentar foi semelhante entre os sexos e apresentou pequena variação ao longo do ano. A análise de 2.401 estômagos revelou que a espécie alimentou-se predominantemente da categoria "peixe" em todos os ambientes amostrados, representando 99% do alimento pela análise gravimétrica. O período reprodutivo é longo e se estende por quase todo o ano, embora esteja mais concentrado entre o início da primavera e o verão, quando foram observados os maiores valores da relação gonadossomática e dos estádios avançados de maturação gonadal. A desova é do tipo parcelada. A fecundidade absoluta (média ± DP) é de 33.470 ± 19.151 ovócitos, enquanto a fecundidade relativa é de 139 ± 56 ovócitos/mm e 152 ± 66 ovócitos/g. O diâmetro médio dos ovócitos maduros é de 897,5 ± 365,4 Pm. Acestrorhynchus pantaneiro é mais abundante nos ambientes lênticos e apresenta características biológicas que favorecem o estabelecimento da espécie em ambientes formados pelo represamento dos rios.

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Section: Discussionmentioning

confidence: 79%

Reproductive and feeding biology of Acestrorhynchus pantaneiro Menezes, 1992 (Osteichthyes: Acestrorhynchidae) in areas under the influence of dams in the upper Uruguay River, Brazil

Meurer

Zaniboni‐Filho²

2012

Neotrop. ichthyol.

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“…Oligosarcus hepsetus showed fractional spawning, as did the same species in the Lajes reservoir , as well as Oligosarcus jenynsii (Hartz et al, 1997;HermesSilva et al, 2004) and Oligosarcus robustus (Nunes et al, 2004). This type of spawning is characterized by the synchronic development of oocyte lots in progressive stages of maturation, which will be eliminated along the reproductive period (Vazzoler, 1996), and is a frequent strategy of species living in stable (Mazzoni and Iglesias-Rios, 2002) and restricted conditions for the survival of eggs and larvae (Nikolskii, 1969;Bagenal, 1971;Jepsen et al, 1999).…”

Section: Discussionmentioning

confidence: 93%

“…However, the reproductive period of Oligosarcus argenteus (Günther, 1864) and Oligosarcus longirostris Menezes and Géry, 1983 was found to occur only in summer (Neves et al, 1995;Gealh and Hahn, 1998). The long period of reproduction of Oligosarcus hepsetus was also characteristic of Oligosarcus jenynsii, which presented it from summer to spring in Argentina (Vazzoler and Menezes, 1992), from winter to summer in the Caconde and Fortaleza lagoons (RS) (Hartz et al, 1996;1997;Nunes et al, 2004), and from winter to spring in the Custódias lagoon (RS) (Fialho et al, 1998 (Kramer, 1978). In the Santa Virgínia Unit is practically devoid of a dry season and the climatic conditions vary little due to its proximity to the ocean (Tonhasca Jr., 2005).…”

Section: Discussionmentioning

confidence: 99%

Reproduction of Oligosarcus hepsetus (Cuvier, 1829) (Characiforms) in the Serra do Mar State Park, São Paulo, Brazil

2008

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The purpose of this study was to characterize the reproduction of Oligosarcus hepsetus in the Grande river (Santa Virginia Unit -Serra do Mar State Park) based on the reproductive period, length of first gonadal maturation for both sexes, sexual proportion, oocyte development, type of spawn and fecundity. The Grande river was sampled monthly from January through December 2004. The numerical frequency of the stages of maturity and the volumetric method were utilized to determine the reproductive period and fecundity, respectively. The reproduction of Oligosarcus hepsetus was characterized by a long period, relatively low fecundity, precocious length of first gonadal maturation and parceled spawning.

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“…3;Hartz, Barbieri, 1994;Fialho et al, 1998;Schifino et al, 1998;Becker, 2001;Nunes et al, 2004;Maia et al, 2013). One example is C. voga.…”

Section: Discussionmentioning

confidence: 99%

Defining the reproductive period of freshwater fish species using the Gonadosomatic Index: a proposed protocol applied to ten species of the Patos Lagoon basin

et al. 2018

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This contribution records the reproductive periods of ten dominant freshwater fish species from the Patos Lagoon and Guaíba Lake (Astyanax fasciatus, Cyphocharax voga, Hoplias malabaricus, Oligosarcus jenynsii, Oligosarcus robustus, Hoplosternum littorale, Loricariichthys anus, Parapimelodus nigribarbis, Trachelyopterus lucenai, Pachyurus bonariensis). Data were derived from monthly samples in Casamento Lake (northern Patos Lagoon; Nov. 2002 to Apr. 2004) and Guaíba Lake (Jun. 2005 to May 2006). The reproductive period was determined according to the monthly variation of the gonadosomatic index (GSI). Fish reproduction was identified during all months of the year. Oligosarcus jenynsii started reproduction in winter, but extended spawning to spring (early warming-water reproduction). Three species also presented reproduction during warming water months, but beginning in spring and finishing in summer (late warm-water reproduction): P. nigribarbis, T. lucenai and P. bonariensis. Three species presented relatively short reproduction periods on summer (spotted warm-water reproduction): H. malabaricus, H. littorale and L. anus, and only one species reproduces almost continuously during warmer waters (long-season warm-water reproduction): A. fasciatus. Finally, two other species presented a very distinct reproductive pattern, starting reproduction on late summer but increasing GSI values along autumn and winter (long-season cooling-water reproducers): C. voga and O. robustus.

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Dinâmica reprodutiva de Oligosarcus jenynsii e O. robustus (Characiformes, Characidae) na lagoa Fortaleza, Rio Grande do Sul, Brasil

Cited by 14 publications

References 4 publications

Reproductive and feeding biology of Acestrorhynchus pantaneiro Menezes, 1992 (Osteichthyes: Acestrorhynchidae) in areas under the influence of dams in the upper Uruguay River, Brazil

Reproductive and feeding biology of Acestrorhynchus pantaneiro Menezes, 1992 (Osteichthyes: Acestrorhynchidae) in areas under the influence of dams in the upper Uruguay River, Brazil

Reproduction of Oligosarcus hepsetus (Cuvier, 1829) (Characiforms) in the Serra do Mar State Park, São Paulo, Brazil

Defining the reproductive period of freshwater fish species using the Gonadosomatic Index: a proposed protocol applied to ten species of the Patos Lagoon basin

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