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Fig. 4 in Taxonomy of Pimelodus brevis Marini, Nichols & La Monte, 1933 (Siluriformes: Pimelodidae), an uncertain species from the rio Paraná basin

Fig. 4. Linear regression of percent of orbital diameter (OD) on standard length of Pimelodus argenteus, P. albicans, and P. brevis. R2 = coefficient of determination.

Fig. 3. Pimelodus argenteus, MCP 19248, 204.7 in Taxonomy of Pimelodus brevis Marini, Nichols & La Monte, 1933 (Siluriformes: Pimelodidae), an uncertain species from the rio Paraná basin

Fig. 3. Pimelodus argenteus, MCP 19248, 204.7 mm SL, Bella Vista, río Paraná, Corrientes, Argentina. Photo by André Canto.

Fig. 1 in Taxonomy of Pimelodus brevis Marini, Nichols & La Monte, 1933 (Siluriformes: Pimelodidae), an uncertain species from the rio Paraná basin

Fig. 1. Pimelodus brevis Marini, Nichols & La Monte, 1933, holotype, AMNH 12240, 285.0 mm SL. Modified from Marini et al. (1933).

Fig. 6 in Taxonomy of Pimelodus brevis Marini, Nichols & La Monte, 1933 (Siluriformes: Pimelodidae), an uncertain species from the rio Paraná basin

Fig. 6. Pimelodus argenteus, syntype, MSNG 14570, 165 mm SL, río de la Plata, río Paraná, Colonia Resistencia [Departamento San Fernando], Argentina. Photo by Mark Allen.

Fig. 2. Arius albicans Valenciennes, 1840 in Taxonomy of Pimelodus brevis Marini, Nichols & La Monte, 1933 (Siluriformes: Pimelodidae), an uncertain species from the rio Paraná basin

Fig. 2. Arius albicans Valenciennes, 1840 (= Pimelodus albicans), holotype, MNHN 9400, 485 mm SL, Buénos- Ayres [= Buenos Aires, Argentina]. Photo by Hautecoeur M.

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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).

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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. 7 in Characterization of the early development of Pseudoplatystoma reticulatum Eigenmann & Eigenmann, 1889 (Siluriformes: Pimelodidae) from the Paraguay River Basin

Fig. 7. Growth coefficients of the head, trunk, and tail during the development of Pseudoplatystoma reticulatum. Larvae in preflexion (a), flexion (b), and postflexion (c) stages; and juvenile (d).

Fig. 4 in Characterization of the early development of Pseudoplatystoma reticulatum Eigenmann & Eigenmann, 1889 (Siluriformes: Pimelodidae) from the Paraguay River Basin

Fig. 4. Drawings and photographs of larvae at different stages and juvenile of Pseudoplatystoma reticulatum: (a) yolk-sac larva (newly-hatched): TL = 3.05 mm; (b) preflexion: age = 12 h, TL = 3.91 mm; (c) early flexion: age = 2 days, TL = 5.85mm; (d) intermediate flexion: age = 4 days, TL = 7.91mm; (e) late flexion: age = 6 days, TL = 8.22 mm; (f) early postflexion: age = 7 days, TL = 9.23 mm; (g) intermediate postflexion: age = 8 days, TL = 10.38 mm; (h) late postflexion: age = 10 days, TL = 9.55mm; and (i) juvenile: age = 21 days, TL = 36.42 mm. Scale = 1 mm.

Fig. 6 in Characterization of the early development of Pseudoplatystoma reticulatum Eigenmann & Eigenmann, 1889 (Siluriformes: Pimelodidae) from the Paraguay River Basin

Fig. 6. Allometric growth of the body parts in relation to the total length during the development of Pseudoplatystoma reticulatum.

Fig. 3 in Characterization of the early development of Pseudoplatystoma reticulatum Eigenmann & Eigenmann, 1889 (Siluriformes: Pimelodidae) from the Paraguay River Basin

Fig. 3. Drawings and photographs of the embryonic development of Pseudoplatystoma reticulatum. (a) morula, (b) gastrula; (c) initial embryo, (d) tail formation, (e) free tail, and (f) final embryo. Scale = 1 mm.

Fig. 1 in Characterization of the early development of Pseudoplatystoma reticulatum Eigenmann & Eigenmann, 1889 (Siluriformes: Pimelodidae) from the Paraguay River Basin

Fig. 1. Schematic diagram of the measurements taken: (a) eggs, (b) larvae, and (c) juveniles of Pseudoplatystoma reticulatum. EGD: total diameter, YSD: yolk-sac diameter, PS: perivitelline space, TL: total length, SL: standard length, SNL: snout length, ED: eye diameter, HL: head length, TRL: trunk length, TAL: tail length, HH: head height, BH: body height at the level of the pectoral fin, BHa: body height at the level of the anus, CPH: caudal peduncle height, PPD: pre pectoral-fin length, PPvD: pre pelvic-fin length, PDD: pre dorsal-fin length, and PAD: pre anal-fin length.

Fig. 5 in Characterization of the early development of Pseudoplatystoma reticulatum Eigenmann & Eigenmann, 1889 (Siluriformes: Pimelodidae) from the Paraguay River Basin

Fig. 5. Pseudoplatystoma reticulatum growth during larval and juvenile development, from hatching to the 24th day of life. Larval stages: A: yolk-sac larva, B = preflexion, C = flexion, and D = postflexion; and E = juvenile. (a) Relationship between total length and age, and (b) relationship between weight and age.

Fig. 2 in Characterization of the early development of Pseudoplatystoma reticulatum Eigenmann & Eigenmann, 1889 (Siluriformes: Pimelodidae) from the Paraguay River Basin

Fig. 2. Morphological events observed during the development of Pseudoplatystoma reticulatum, in the (a) embryonic, (b) larval and juvenile period. YOS: yolk-sac larva, PF: preflexion, FL: flexion, POF: postflexion, and J: juvenile.

FIGURE 6 in Age and growth of Pseudoplatystoma corruscans (Siluriformes: Pimelodidae) at the confluence of the Paraná and Paraguay rivers

FIGURE 6 | Back calculated total length from the pectoral spines readings (B-C TL) and back calculated mean total lengths at age (B-C mean TL) for Pseudoplatystoma corruscans females (A) and males (B), and the respective fitted growth models: Von Bertalanffy (VBF), Gompertz (GPZ) and logistic (LOG).

FIGURE 5 in Age and growth of Pseudoplatystoma corruscans (Siluriformes: Pimelodidae) at the confluence of the Paraná and Paraguay rivers

FIGURE 5 | Monthly averages of the percentage of marginal increase (MI%) in spines of Pseudoplatystoma corruscans, hours of day light (Hs.L.) and hydrometric levels of the Paraná River (HL) during the annual cycle.

FIGURE 2 in Age and growth of Pseudoplatystoma corruscans (Siluriformes: Pimelodidae) at the confluence of the Paraná and Paraguay rivers

FIGURE 2 | A. Detail of a spine of Pseudoplatystoma corruscans in upper and lower views and B. detail of the proximal portion of the spine. Lines indicate the cuts positions. C. View of spine cut showing the ventral radius of the dorso-ventral axis, where distances from the estimated center of the spine foramen to the edge (Rt) and to each growth ring (Rn) were measured.

FIGURE 4 in Age and growth of Pseudoplatystoma corruscans (Siluriformes: Pimelodidae) at the confluence of the Paraná and Paraguay rivers

FIGURE 4 | Distances from the center of the spine to the first ring (black diamonds) in individuals of Pseudoplatystoma corruscans with different numbers of growth rings and their respective mean values (squares). The horizontal line represents the general mean value.

FIGURE 3 in Age and growth of Pseudoplatystoma corruscans (Siluriformes: Pimelodidae) at the confluence of the Paraná and Paraguay rivers

FIGURE 3 | Total length (TL) frequency distribution of Pseudoplatystoma corruscans specimens discriminated by sexes.