Dynamics and cytochemistry of oogenesis in Astyanax fasciatus (Cuvier) (Teleostei, Characiformes, Characidae) from Rio Sapucaí, Minas Gerais State, Brazil
Abstract:ABSTRACT. Oogenes is involves a set of transformations which are undergone by female germ cell s These cells change into oogonias and then into mature oocytes. Sex uall y mature female fi sh were co llected monthly, during one year, from the Sapucaf Ri ver, a tributary of the Rio Grande, which is part of the Furnas Reservoir in the state of Minas Gerais. During the several stages of maturation, we observed small round oogonias with a large nucleus, a single nucleolus, and weakly stai ned cytoplas m wi th eos i… Show more
“…The lamellae are lined by the germinal epithelium composed of scattered oogonia and the somatic epithelial cells, which are derived from coelomic epithelial cells. The consistent form and function of the germinal epithelium has been described in several teleosts (Grier, ; Dias Garcia et al, ; Parenti and Grier, ; Grier et al, ; Quagio‐Grassiotto et al, ; Uribe and Grier, ; Uribe et al, ; Meijide et al, ).…”
Section: Discussionsupporting
confidence: 62%
“…Folliculogenesis of J. floridae begins within the germinal epithelium when oogonia enter into meiosis, becoming oocytes, then, individual oocytes become encompassed by prefollicle cells. When the oogonium and prefollicle cells become fully enclosed within a basement membrane, folliculogenesis is complete and the prefollicle cells are then follicle cells, similar to those described in other teleosts (Grier, ; Dias Garcia et al, ; Grier et al, ; Quagio‐Grassiotto et al, ; Uribe et al, ; Wildner et al, ; Parenti et al, ; Meijide et al, ), and in other vertebrates species as detailed in a comprehensive review by Grier et al, ). Folliculogenesis commonly occurs in groups of somatic and germ cells that form cell nests within the germinal epithelium.…”
Section: Discussionmentioning
confidence: 54%
“…The cortical alveoli and oil droplets of J. floridae are initially developed adjacent to the germinal vesicle, during the primary growth stage, similar to what is seen in the characids Astyanax bimaculatus and A. fasciatus , in which cortical alveoli first appear in a developing oocyte at the end of the advanced perinucleolar stage, which marks the beginning of yolk formation (Anderson, ; Bazzoli and Pereira Godhino, ; Dias Garcia et al, ; Quagio‐Grassiotto et al, ).…”
Section: Discussionmentioning
confidence: 77%
“…The micropyle is the only region through which the sperm enters the oocyte during fertilization. It has been described in numerous species of teleosts, such as F. heteroclitus by Kuchnow and Scott () and Dumont and Brummett (), Oncorhynchus keta by Kobayashi and Yamamoto (), Oncorhynchus mykiss by Kagawa (), Barbus conchonius by Amanze and Iyengar (), Astyanax fasciatus by Dias Garcia et al (), F. grandis by Grier et al (), E. latos by Uribe et al (), and the hermaphrodite, C. agassizi by Parenti et al (). Morphology of the micropyle was reviewed in detail by Kunz () who described four micropyle morphotypes.…”
“…The lamellae are lined by the germinal epithelium composed of scattered oogonia and the somatic epithelial cells, which are derived from coelomic epithelial cells. The consistent form and function of the germinal epithelium has been described in several teleosts (Grier, ; Dias Garcia et al, ; Parenti and Grier, ; Grier et al, ; Quagio‐Grassiotto et al, ; Uribe and Grier, ; Uribe et al, ; Meijide et al, ).…”
Section: Discussionsupporting
confidence: 62%
“…Folliculogenesis of J. floridae begins within the germinal epithelium when oogonia enter into meiosis, becoming oocytes, then, individual oocytes become encompassed by prefollicle cells. When the oogonium and prefollicle cells become fully enclosed within a basement membrane, folliculogenesis is complete and the prefollicle cells are then follicle cells, similar to those described in other teleosts (Grier, ; Dias Garcia et al, ; Grier et al, ; Quagio‐Grassiotto et al, ; Uribe et al, ; Wildner et al, ; Parenti et al, ; Meijide et al, ), and in other vertebrates species as detailed in a comprehensive review by Grier et al, ). Folliculogenesis commonly occurs in groups of somatic and germ cells that form cell nests within the germinal epithelium.…”
Section: Discussionmentioning
confidence: 54%
“…The cortical alveoli and oil droplets of J. floridae are initially developed adjacent to the germinal vesicle, during the primary growth stage, similar to what is seen in the characids Astyanax bimaculatus and A. fasciatus , in which cortical alveoli first appear in a developing oocyte at the end of the advanced perinucleolar stage, which marks the beginning of yolk formation (Anderson, ; Bazzoli and Pereira Godhino, ; Dias Garcia et al, ; Quagio‐Grassiotto et al, ).…”
Section: Discussionmentioning
confidence: 77%
“…The micropyle is the only region through which the sperm enters the oocyte during fertilization. It has been described in numerous species of teleosts, such as F. heteroclitus by Kuchnow and Scott () and Dumont and Brummett (), Oncorhynchus keta by Kobayashi and Yamamoto (), Oncorhynchus mykiss by Kagawa (), Barbus conchonius by Amanze and Iyengar (), Astyanax fasciatus by Dias Garcia et al (), F. grandis by Grier et al (), E. latos by Uribe et al (), and the hermaphrodite, C. agassizi by Parenti et al (). Morphology of the micropyle was reviewed in detail by Kunz () who described four micropyle morphotypes.…”
“…For each female three fields were photographed on a microscope (Nikon, Eclipse50i) with an attached camera (BEL, Stmpro-T-Led; software BEL View) under 200x magnification and analyzed using a 165-intersection grid (ImageJ 1.39p). Developmental stages of oocytes were identified based on the study of Garcia et al (2001).…”
This study aimed to evaluate the effect of manipulating hours of light and water temperature in some important reproductive parameters for Astyanax altiparanae fish farming during winter. The experiment was conducted from July 3 rd to August 28 th 2013 (57 days), and two groups of 32 couples of fish (G1 and G2) were used. On G1, hours of light and water temperature were not controlled; on G2, otherwise, these variables were manipulated in order to achieve similar conditions to those observed in spring. Every 14 days, eight couples of each group were hormonally induced with carp pituitary gland extract, and eggs were collected after semi-natural spawning. The percentage of females from G2 that spawned was higher than G1 (81.25 vs. 9.38%), the same trend was observed for a number of eggs produced per female (G1: 2,976.57 ± 1,085.71; G2: 8,471.14 ± 860.08). The G2 ovaries presented a higher incidence of primary growth oocytes and post-ovulatory follicles whereas G1 ovaries had more atretic follicles. Economic analysis showed that operational profit from eggs and larvae production on G2 was higher than on G1, as well as the gross margin. In conclusion, the results showed that environmental manipulation might improve reproduction management practices extending eggs and larvae production during the natural non-breeding season. Further studies are necessary to determine more appropriate facilities to be used by farmers in large scale, as well as management protocols to ensure the survival of post-larvae.
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