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19 results for “Steindachneridion”
Fig. 3 in A case of intersex occurrence in Steindachneridion parahybae (Steindachner, 1877) (Siluriformes: Pimelodidae) under captivity condition: a cytogenetic and morphological study
Fig. 3. Micrographs of the ovotestes of Steindachneridion parahybae juveniles in captivity showing the different germ cell types. a) unrestricted spermatogonial testes with anastomosing tubular type, composed by numerous tubules (arrowhead); b) many spermatozoa inside the tubular lumen (arrowhead), separated by interstitial tissue (asterisk); c) gonads section showing perinucleolar oocyte (arrow) close to testicular tissue (arrowhead), containing spermatozoa inside the duct and many intratubular cists; d) ovotestes showing perinucleolar oocyte (arrow) close to spermatozoa inside the duct (arrowhead). Periodic-Acid-Schiff (PAS)/Weigert's Haematoxylin/Metanil Yellow staining. Scale bars: 74 µm (a); 19 µm (b, d); 37 µm (c).
Fig. 4 in A case of intersex occurrence in Steindachneridion parahybae (Steindachner, 1877) (Siluriformes: Pimelodidae) under captivity condition: a cytogenetic and morphological study
Fig. 4. Karyotype in Giemsa in male (a), detail in (b), in female (c), detail in (d) and in intersex animal (e), detail in (f) of Steindachneridion parahybae from Unidade de Hidrobiologia e Aquicultura, Companhia Energética de São Paulo. See the text for more information about karyotype characteristics. Scale bars: 37 μm (a,c,e); 7,4 μm (b,d,f).
Fig. 2 in A case of intersex occurrence in Steindachneridion parahybae (Steindachner, 1877) (Siluriformes: Pimelodidae) under captivity condition: a cytogenetic and morphological study
Fig. 2. Micrographs of the testes of Steindachneridion parahybae juveniles in captivity showing the different germ cell types. a) unrestricted spermatogonial testes with anastomosing tubular type, composed by numerous tubules (arrowhead), which contained the germinal compartment (GC, indicate with arrow) and separated by interstitial tissue; b) isolated spermatogonia cell (arrow) surrounded by Sertoli cells (arrowhead), separated by interstitial tissue (asterisk); c) many spermatocytes and spermatids within the cysts (arrowhead), separated by interstitial tissue (asterisk); d) cysts of spermatocytes (arrowhead), separated by interstitial tissue (asterisk); e) cysts of spermatids (arrowhead), separated by interstitial tissue (asterisk); f) many spermatozoa inside the tubular lumen (arrowhead). Periodic-Acid-Schiff (PAS)/Weigert's Haematoxylin/Metanil Yellow staining. Scale bars: 74µm (a); 37 µm (f); 19 µm (c,e); 14 µm (b); 7.4 µm (d).
Fig. 2 in Inseminating dose and water volume applied to the artificial fertilization of Steindachneridion parahybae (Steindachner, 1877) (Siluriformes: Pimelodidae): Brazilian endangered fish
Fig. 2. Values of hatching rate (Hatch) of Steindachneridion parahybae with regard to different inseminating doses versus water volume. Left – 3D graphical representation. Right – 2D graphical representation. Spermatozoa oocytes-1 (spz ooc-1).
Fig. 1 in Inseminating dose and water volume applied to the artificial fertilization of Steindachneridion parahybae (Steindachner, 1877) (Siluriformes: Pimelodidae): Brazilian endangered fish
Fig. 1. Values of fertilization rates (Fert) of Steindachneridion parahybae with regard to different inseminating doses versus water volume. Left – 3D graphical representation. Right – 2D graphical representation. Spermatozoa oocyte-1 (spz ooc-1). r²=77.47%.
Fig. 1 in Scientific Note Induced spawning of the endangered Neotropical species Steindachneridion parahybae (Siluriformes: Pimelodidae)
Fig. 1. Steindachneridion parahybae, Paraíba do Sul River basin, Paraibuna, São Paulo State, Brazil. Lateral view (image by Caneppele).
Fig. 5 in Revision of genus Steindachneridion (Siluriformes: Pimelodidae)
Fig. 5. Lateral and dorsal views of S. doceanum. MZUSP 87988, 420 mm SL, Ponte Nova, rio Piranga, tributary of rio Doce, Minas Gerais, Brazil.
Fig. 8 in Revision of genus Steindachneridion (Siluriformes: Pimelodidae)
Fig. 8. Lateral and dorsal views of S. punctatum. MZUSP 87985, 632 mm SL, Jaguara, rio Grande, Cachoeira Mata-Doutor, downstream of Jaguara hydroeletric power dam, São Paulo, Brazil.
Fig. 10 in Revision of genus Steindachneridion (Siluriformes: Pimelodidae)
Fig. 10. Projection scores of individuals of three species of Steindachneridion from Paraná and Uruguay basins on the first two canonical variates, CV1 and CV2.
Fig. 4 in Revision of genus Steindachneridion (Siluriformes: Pimelodidae)
Fig. 4. Lateral view of S. amblyurum syntype. MCZ 7324, 380 mm SL, rio Jequitinhonha, along Jequitinhonha valley, Minas Gerais, Brazil.
Fig. 9 in Revision of genus Steindachneridion (Siluriformes: Pimelodidae)
Fig. 9. Lateral and dorsal views of S. melanodermatum holotype. MZUSP 87983, 530 mm SL, municipality of Quedas do Iguaçu, rio Iguaçu, down river of the Salto Osório dam, Paraná, Brazil.
Fig. 7 in Revision of genus Steindachneridion (Siluriformes: Pimelodidae)
Fig. 7. Lateral and dorsal views of S. scriptum. MZUSP 88015, 690 mm SL, Jaguara, rio Grande, cachoeira Mata-Doutor, downstream of Jaguara hydroelectric power dam, São Paulo, Brazil.
Fig. 3 in Revision of genus Steindachneridion (Siluriformes: Pimelodidae)
Fig. 3. Lateral and dorsal views of S. amblyurum. MZUSP 87986, 334 mm SL, Almenara, rio Jequitinhonha, ilha Bela Vista, Minas Gerais, Brazil.
Fig 2 in Revision of genus Steindachneridion (Siluriformes: Pimelodidae)
Fig 2. Lateral and dorsal views of S. parahybae. MNRJ 12237, 384 mm SL, rio Paraíba do Sul, at confluence with rio Piabanha and rio Paraibuna, Pontal, Rio de Janeiro, Brazil.
Fig. 6 in Revision of genus Steindachneridion (Siluriformes: Pimelodidae)
Fig. 6. Lateral view of S. doceanum, syntype. MCZ 23794, 307 mm SL, rio Doce between Linhares and Aimorés, Espírito Santo, Brazil.
Fig. 1 in Revision of genus Steindachneridion (Siluriformes: Pimelodidae)
Fig. 1. Southeastern South America with the geographical distribution of Steindachneridion species. Each symbol may represent more than one sample.
Fig. 2 in First chromosome data on Steindachneridion doceanum (Siluriformes: Pimelodidae): a critically endangered catfish endemic of the Doce River basin, Brazil
Fig. 2. Karyotypes of S. doceanum: a. Giemsa staining; b. C-banding pattern characterized by the many heterochromatin blocks in different positions. In the boxes chromosome pairs of S. doceanum: c. Ag-NOR sites; d. CMA3 staining; e. FISH with 5S DNAr probe.
Fig. 1 in First chromosome data on Steindachneridion doceanum (Siluriformes: Pimelodidae): a critically endangered catfish endemic of the Doce River basin, Brazil
Fig. 1. Specimen of Steindachneridion doceanum. Partial map of Brazil showing the localization of the Doce River basin. The dot represents the collection location (Piranga River) and the asterisk the impacted by the waste discharge.
Fig. 1 in A case of intersex occurrence in Steindachneridion parahybae (Steindachner, 1877) (Siluriformes: Pimelodidae) under captivity condition: a cytogenetic and morphological study
Fig. 1. Micrographs of the ovaries of Steindachneridion parahybae juveniles in captivity showing different germ cell types. a) scattered oogonia (arrow) within the germinal epithelium surrounded by prefollicle cells (arrowhead); b) proliferation of the oogonium gives rise to cell cluster that appears as small nests (delimited by the arrows), and are also surrounded by prefollicle cells (arrowhead); c) inside this nests, oogonia (arrow) enter into meiosis and progressively individualized by cells derived from the epithelium (prefollicle cells), and they become separated from nests, originating the oocytes (arrowhead); d) following the ovarian development, early primary growth or perinucleolar oocyte (arrowhead) is characterized by an enhancement of cytoplasm basophilia; e) Perinucleolar oocyte (asterisk) showing the thin follicular layer (arrow) and multiple nucleoli displaced in a perinuclear position (arrowhead); f) Perinucleolar stage in different size, showing in an initial (arrowhead) and advanced stage (arrow). Periodic-Acid-Schiff (PAS)/Weigert's Haematoxylin/Metanil Yellow staining. Scale bars: 10 µm (a); 30 µm (b,c,d,e); 400 µm (f).
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