2021
DOI: 10.1111/jfb.14879
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Gonadal morphology and difference in reproductive development of two isolated populations of Astyanax rivularis (Teleostei, Characidae)

Abstract: Individuals of the same species may present different reproductive tactics depending on the environment in which they develop and mature. The present study aimed to define the gonadal development phases of males and females of Astyanax rivularis and to carry out a comparative analysis of the reproductive development of specimens captured in two isolated environments of the São Francisco River basin in Serra da Canastra, Brazil (Point 1: low vegetation and river showing calm and crystalline waters with small we… Show more

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Cited by 2 publications
(2 citation statements)
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“…The theca layer of the type IV oocyte of H. marginatus showed significant differences in the pattern of thickness and morphology between the species in the present study, unlike what is observed among teleost where there are no major morphological variations in this layer; its appearance is observed in the early stages of oogenesis, being one of the first layers of the follicular complex to form [ [59] , [60] , [61] , [62] ]. Additionally, an extensive fibrillar network was observed in the theca layer in A. ucayalensis and A. longimanus (group 1) and P. oligospila (group 2).…”
Section: Discussionmentioning
confidence: 68%
“…The theca layer of the type IV oocyte of H. marginatus showed significant differences in the pattern of thickness and morphology between the species in the present study, unlike what is observed among teleost where there are no major morphological variations in this layer; its appearance is observed in the early stages of oogenesis, being one of the first layers of the follicular complex to form [ [59] , [60] , [61] , [62] ]. Additionally, an extensive fibrillar network was observed in the theca layer in A. ucayalensis and A. longimanus (group 1) and P. oligospila (group 2).…”
Section: Discussionmentioning
confidence: 68%
“…This species can spawn throughout the year, with peak spawning activity in spring and summer, with an increase in air temperature associated with precipitation, as evidenced by numerous studies (Baroiller et al, 2009;Bartolini et al, 2015;Firkus et al, 2018;Quirino et al, 2021). This characin's reproductive characteristics indicate an opportunistic (r) strategy, which is common in small-sized species, particularly Characiformes, with no or little parental care and a long reproductive period (Winemiller, 1989;Vazzoler, 1996;Quirino et al, 2021).…”
Section: Discussionmentioning
confidence: 96%