Reproductive biology of weakly electric fish Eigenmannia trilineata López and Castello, 1966 (Teleostei, Sternopygidae)

Giora, Julia; Fialho, Clarice Bernhardt

doi:10.1590/s1516-89132009000300014

Cited by 20 publications

(20 citation statements)

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“…The B. draco population studied showed an iteroparous life-history strategy, agreeing with the results that have been obtained for other species of Gymnotiformes (Barbieri & Barbieri, 1982;Assunção & Schwassmann, 1995;Kirschbaum & Schugardt, 2002;Quintana et al, 2004;Cognato & Fialho, 2006;Giora & Fialho, 2009;Giora, 2008).…”

Section: Discussionsupporting

confidence: 90%

“…Two other studies with Gymnotiformes from southern Brazil have shown slightly higher relative fecundities for the species, these being 0.20 oocytes per mg of total weight for Gymnotus aff. carapo (Cognato & Fialho, 2006) and 0.27 for E. trilineata (Giora & Fialho, 2009). According to Vazzoler (1996), fecundity depends, as a last resort, on the coelomatic cavity capacity of lodge ripe oocytes and of oocyte size.…”

Section: Discussionmentioning

confidence: 99%

“…Caudal filaments depth Level 1 = from 0 to 1.5%; Level 2 = from 1.51% to 2.5%; Level 3 = from 2.51% to 3.50%. (Silva et al, 1999;Ardanaz et al, 2001;Silva et al, 2002;Quintana et al, 2004), in photoperiod (Giora & Fialho, 2009) or in both temperature and photoperiod (Silva et al, 2003;Cognato & Fialho, 2006). For the B. draco population from lagoa Verde, the male reproductive cycle showed a positive relation with temperature, but no relation was found for photoperiod.…”

Section: Discussionmentioning

confidence: 99%

“…However, the rainfall data obtained for the study area did not show a statistically significant relation with male and female reproductive periods. Studies at Parque Estadual de Itapuã concerning gymnotiform species have established reproductive periods occurring from October to February for Eigenmannia trilineata (Giora & Fialho, 2009) and from November to March for Gymnotus aff. carapo (Cognato & Fialho, 2006).…”

Section: Discussionmentioning

confidence: 99%

“…In southern Brazil, studies on the reproductive biology of gymnotiform species have been undertaken by Cognato & Fialho (2006) on Gymnotus aff. carapo, by Giora & Fialho (2009) concerning Eigenmannia trilineata, and by Giora (2008) concerning two Brachyhypopomus species, all in the protected area of Parque Estadual de Itapuã.…”

Section: Introductionmentioning

confidence: 99%

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Reproductive biology of the Neotropical electric fish Brachyhypopomus draco (Teleostei: Hypopomidae) from southern Brazil

2009

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The reproductive biology of a population of the weakly electric fish Brachyhypopomus draco from southern Brazil is described. Information is provided on the establishment of the reproductive period in this species and its relations with environmental and feeding factors, as well as on the absolute and relative fecundities, spawning type, sex ratio and sexual dimorphism. The species exhibits a relatively long reproductive period, a relative fecundity of 0.173 oocytes per mg of female total weight, and fractional spawning. The sex ratio did not differ from 1:1 during all sampled months. Sexual dimorphism related to hypertrophy of the male's distal portion of caudal filament was observed and males grew to greater lengths than females. Male gonadosomatic index (GSI) was significantly related to water depth, oxygen saturation and temperature. Female GSI was significantly related to water depth and hepatosomatic index.Descreve-se a biologia reprodutiva de uma população do peixe elétrico Brachyhypopomus draco do sul do Brasil. São apresentadas informações a respeito do período reprodutivo estabelecido e suas relações com fatores ambientais e alimentares, bem como a fecundidade absoluta e relativa, tipo de desova, proporção sexual e dimorfismo sexual. A espécie apresentou um período reprodutivo relativamente longo, uma fecundidade relativa de 0,173 ovócitos por mg de peso total da fêmea e uma desova do tipo parcelada. A proporção sexual encontrada foi de 1:1 durante todos os meses amostrados. Dimorfismo sexual relacionado com a hipertrofia da porção distal do filamento caudal dos machos e com o tamanho total dos espécimes -machos atingindo tamanhos maiores do que as fêmeas -foi encontrado. O IGS dos machos foi significativamente relacionado com a profundidade da água, a saturação de oxigênio e a temperatura; o IGS das fêmeas foi significativamente relacionado com a profundidade da água e o índice hepatossomático.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reproductive biology of the Neotropical electric fish Brachyhypopomus draco (Teleostei: Hypopomidae) from southern Brazil

2009

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Reproduction and feeding habits of the highly seasonal Brachyhypopomus bombilla (Gymnotiformes: Hypopomidae) from southern Brazil with evidence for a dormancy period

2011

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The reproductive biology and feeding habits of the hypopomid Brachyhypopomus bombilla were studied. The species has seasonal behavior, with breeding and feeding activity occurring mostly during the Southern Hemisphere spring and summer. We defined fractional spawning for the species and a relative fecundity similar to those previously reported for other gymnotiform species. According to the analysis of the food items, B. bombilla was included in the trophic category invertivorous, feeding mainly on autochthonous insects. The reproductive periods of males and females as well as female feeding activity were significantly related to the photoperiod. During a period of 5 months, when the lowest water temperatures and shortest photoperiod were recorded, all the specimens of B. bombilla were found buried in the muddy bottom of the creek, with lower electric organ discharge activity, empty stomachs, and gonads in early stages of the maturation process. This period, herein defined as a dormancy period, is reported here for the first time for a species of the Gymnotiformes order.

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Life history of Gymnotus refugio (Gymnotiformes; Gymnotidae): an endangered species of weakly electric fish

2016

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Reproductive biology of weakly electric fish Eigenmannia trilineata López and Castello, 1966 (Teleostei, Sternopygidae)

Abstract: This study described the reproductive biology of a population of the weakly electric fish

Cited by 20 publications

References 12 publications

Reproductive biology of the Neotropical electric fish Brachyhypopomus draco (Teleostei: Hypopomidae) from southern Brazil

Reproductive biology of the Neotropical electric fish Brachyhypopomus draco (Teleostei: Hypopomidae) from southern Brazil

Reproduction and feeding habits of the highly seasonal Brachyhypopomus bombilla (Gymnotiformes: Hypopomidae) from southern Brazil with evidence for a dormancy period

Life history of Gymnotus refugio (Gymnotiformes; Gymnotidae): an endangered species of weakly electric fish

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