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24 results for “Pimelodus maculatus”
Fig. 4 in Reproduction of Pimelodus maculatus (Siluriformes: Pimelodidae) in three section of Grande River basin, downstream Porto Colombia dam, south-eastern Brazil
Fig. 4. Bimonthly frequency of the gonadal maturation stages of P. maculatus males and females from three sampling sections of the Grande River basin, downstream from the Porto Colômbia dam. Section 1: Grande River, downstream from the Porto Colômbia dam; Section 2: confluence of the Grande and Pardo Rivers; Section 3: the Pardo River channel.
Fig. 5 in Reproduction of Pimelodus maculatus (Siluriformes: Pimelodidae) in three section of Grande River basin, downstream Porto Colombia dam, south-eastern Brazil
Fig. 5. PH, dissolved oxygen, electrical conductivity, temperature and water transparency in three sections of the Grande River basin, downstream from the Porto Colômbia dam. Section 1: Grande River, downstream from the Porto Colômbia dam; Section 2: confluence of the Grande and Pardo Rivers; Section 3: the Pardo River channel.
Fig. 3 in Reproduction of Pimelodus maculatus (Siluriformes: Pimelodidae) in three section of Grande River basin, downstream Porto Colombia dam, south-eastern Brazil
Fig. 3. Histological sections of P. maculatus ovaries, in different stages of gonadal maturation, stained with HE. A: Resting, with oogonia nests (Og), initial perinucleolar oocyte (O1) with basophilic cytoplasm and advanced perinucleolar follicles (O2) with granular cytoplasm; B: Initial maturation, with O1, O2 and pre-vitellogenic oocyte (O3) presenting cortical alveoli (arrow head) in the peripheral ooplasm; C: Advanced maturation/mature with O1, O2 and O3 and vitellogenic oocytes with ooplasm filled with acidophilic yolk globules; D: Detail of vitellogenic oocyte with cubic follicular cells (star), thin zona pellucida (*) and funnel-shaped micropile (arrow); E: Partially spawned, with O1, O2, O3, O4 and postovulatory follicles (FPO); insert of post-ovulatory follicle with wide lumen and wall of follicular cells and theca; F: Atretic follicles (AF) in the initial phase with yolk liquefaction and fragmentation of the zona pellucida; G: Partially spawned ovary with atretic follicle (AF) in the intermediate phase with hypertrophy of the follicular cells and an almost fully reabsorbed yolk; H: Fully spawned ovary with O1, O2 and atretic follicle in the final stage, forming yellow bodies (YB). Scale bars = 50 µm (A, D, insert of POF and H), 100 µm (B, C), 200 µm (E-G).
Fig. 2 in Reproduction of Pimelodus maculatus (Siluriformes: Pimelodidae) in three section of Grande River basin, downstream Porto Colombia dam, south-eastern Brazil
Fig. 2. Histological sections of P. maculatus testes, in different stages of gonadal maturation, stained with HE. A: Resting with seminiferous tubules closed containing only spermatogonia; B: Initial maturation, with seminiferous tubules containing all spermatogenic lineage cells and a small amount of sperm; C: Advanced maturation/mature, with seminiferous tubules filled with sperm; D: Partially spent, with open seminiferous tubules containing a considerable amount of sperm; E: Caudal region of a partially spent testis with globular acidophilic secretion (circle); F: fully spent, with open seminiferous tubules containing residual sperm in the lumen. * = Sperm; Arrow = Spermatogonia. Scale bars = 20 µm (A), 50 µm (B and F), 100 µm (C-E).
FIGURE 1 in Fish injuries resulting from transient operating conditions in a Brazilian hydropower plant: morphological, physiological and biochemical evaluation in Pimelodus maculatus (Siluriformes: Pimelodidae)
FIGURE 1 | Histological gill alterations in Pimelodus maculatus collected during transient operating conditions (magnification: × 400). Arrows indicate the following lesions: A. Aneurysm; B. Epithelium detachment; C. Telangiectasia; and D. Interlamellar hyperplasia.
FIGURE 2 in Fish injuries resulting from transient operating conditions in a Brazilian hydropower plant: morphological, physiological and biochemical evaluation in Pimelodus maculatus (Siluriformes: Pimelodidae)
FIGURE 2 | Histological alterations in liver and spleen of Pimelodus maculatus collected during transient operating conditions in the tailrace of Machadinho HPP (magnification: × 400). Arrows and asterisks indicate the following lesions: A. Melanomacrophage centers (asterisk) and congested vein (arrow) in the liver; B. Blood cells indicating hepatic hemorrhage (asterisk); C. Melanomacrophage centers in the spleen (asterisk); D. Mononuclear inflammatory infiltrate in the spleen (arrow).
Fig. 9. a in Structural analysis of the Pimelodus maculatus (Lacépède, 1803) embryogenesis (Siluriformes: Pimelodidae)
Fig. 9. a - head detail, showing the otic vesicle, oral cavity, cephalic vesicle, closed mouth and eye. b - myogenesis process;
Fig. 2 in Structural analysis of the Pimelodus maculatus (Lacépède, 1803) embryogenesis (Siluriformes: Pimelodidae)
Fig. 2. Pimelodus maculatus embryos in segmentation stage: a - neurula; b - embryo with about 11 somites, optic vesicle,
Fig. 1 in Structural analysis of the Pimelodus maculatus (Lacépède, 1803) embryogenesis (Siluriformes: Pimelodidae)
Fig. 1. Embryonic development stages zygote, cleavage and gastrula in the Pimelodus maculatus. a - post-fertilization
Fig. 3 in Structural analysis of the Pimelodus maculatus (Lacépède, 1803) embryogenesis (Siluriformes: Pimelodidae)
Fig. 3. Pimelodus maculatus embryos in organogenesis (late segmentation phase) and hatching stage. a – more than 30
Fig. 6 in Structural analysis of the Pimelodus maculatus (Lacépède, 1803) embryogenesis (Siluriformes: Pimelodidae)
Fig. 6. Histologicals sections of Pimelodus maculatus embryos. a- detail of the nucleus of the syncyctial layer, at morula
Fig. 7. a in Structural analysis of the Pimelodus maculatus (Lacépède, 1803) embryogenesis (Siluriformes: Pimelodidae)
Fig. 7. a - embryo section at gastrula stage (epiboly of 75%), staining: HE; b - embryo section at gastrula stage (epiboly of
Fig. 2 in Reproductive activity and recruitment of the yellow-mandi Pimelodus maculatus (Teleostei: Pimelodidae) in the Igarapava Reservoir, Grande River, Southeast Brazil
Fig. 2. Histological sections of yellow-mandi ovaries at different stages of gonadal maturation; tissues were fixed in 5% buffered glutaraldehyde and then post-fixed in Bouin's fluid; bars = 100 µm. a) Resting stage: chromatin nucleolar (O1) and perinucleolar (O2) were the only types of oocytes present. b) Maturation stage: besides O1 and O2 oocytes, the ovary contained yolk vesicle oocytes (O3). c) Mature stage: at this stage the ovaries showed chromatin nucleolar (O1), perinucleolar (O2) and vitellogenic (O4) oocytes. d) Spawned stage: postovulatory follicle (POF) was a striking structure present in the ovaries at this stage; atresic oocyte (AO); chromatin nucleolar (O1) and perinucleolar (O2) oocytes were also observed.
Fig. 1 in Reproductive activity and recruitment of the yellow-mandi Pimelodus maculatus (Teleostei: Pimelodidae) in the Igarapava Reservoir, Grande River, Southeast Brazil
Fig. 1. Study area; location of Volta Grande, Igarapava and Jaguara reservoirs in the Grande River, Southeast Brazil.
Fig. 1 in Reproduction of Pimelodus maculatus (Siluriformes: Pimelodidae) in three section of Grande River basin, downstream Porto Colombia dam, south-eastern Brazil
Fig. 1. Study area with indication of the sample sections.
FIGURE 2. Pseudovaigamus tridentatus n in A new species of Pseudovaigamus Amado, Ho & Rocha, 1984 (Cyclopoida Ergasilidae) from the teleost Pimelodus maculatus Lacepède, 1803
FIGURE 2. Pseudovaigamus tridentatus n. sp.—adult female. A urosome, dorsal view. B intercoxal sclerites and intercoxal plates, ventral view. C buccal apparatus. is1 to is4 = first to fourth intercoxal sclerites. ip1 to ip3 = first to third intercoxal plates. P5 = fifth leg. S1 = seta 1. S2 = seta 2. S3 = seta 3. S4 = seta 4. Scale bars in µm.
FIGURE 3. Pseudovaigamus tridentatus n in A new species of Pseudovaigamus Amado, Ho & Rocha, 1984 (Cyclopoida Ergasilidae) from the teleost Pimelodus maculatus Lacepède, 1803
FIGURE 3. Pseudovaigamus tridentatus n. sp.—adult female. A leg 1. B leg 2. C leg 3. D leg 4. Scale bars in µm.
FIGURE 5 in A new species of Pseudovaigamus Amado, Ho & Rocha, 1984 (Cyclopoida Ergasilidae) from the teleost Pimelodus maculatus Lacepède, 1803
FIGURE 5. Morphological variation of retrostylets in vaigamid genera. A Gamispatulus schizodontis Thatcher & Boeger, 1984 from Thatcher & Boeger (1984a), with spatulate process (seta). B Gamispinus diabolicus Thatcher & Boeger, 1984 from Thatcher & Boeger (1984b). C Gamidactylus piranhus Thatcher, Santos & Brasil-Sato, 2008 from Thatcher et al. (2008). D Vaigamus retrobarbatus Thatcher & Robertson, 1984 from Thatcher & Robertson (1984), with innermost portion extending posteriorly (seta). E Pseudovaigamus spinicephalus (Thatcher & Robertson, 1984) from Thatcher & Robertson (1984), with innermost portion extending posteriorly (seta). F Pseudovaigamus tridentatus n. sp., with innermost portion extending posteriorly (seta). Scale bars in µm.
Fig. 29. a. Pimelodus maculatus, NUP 12783, 214.4 in Peixes da planície de inundação do alto rio Paraná e áreas adjacentes: revised, annotated and updated
Fig. 29. a. Pimelodus maculatus, NUP 12783, 214.4 mm SL, lagoa da Onça, Batayporã, State of Mato Grosso do Sul. b. Pimelodus microstoma, NUP 18158, 117.6 mm SL, rio Azul, Palotina, State of Paraná. c. Pimelodus mysteriosus, NUP 10824, 158.0 mm SL, lagoa do Guaraná, tributary of the rio Baía, Taquarussu, State of Mato Grosso do Sul. d. Pimelodus ornatus, 208.0 mm SL, fresh specimen, uncat. e. Pimelodus paranaensis, 168.0 mm SL, uncat.
Fig. 5 in Structural analysis of the Pimelodus maculatus (Lacépède, 1803) embryogenesis (Siluriformes: Pimelodidae)
Fig. 5. Histologicals sections of Pimelodus maculatus embryos in cleavage stage. a - with 2 cells, staining: HE, showing
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