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56 results for “Osteoglossiformes”
Figure 5 from: Yanwirsal H, Bartsch P, Kirschbaum F (2017) Reproduction and development of the asian bronze featherback Notopterus notopterus (Pallas, 1769) (Osteoglossiformes, Notopteridae) in captivity. Zoosystematics and Evolution 93(2): 299-324. https://doi.org/10.3897/zse.93.13341
Figure 5 - Spawning sequence of Notopterus notopterus during night time. Picture sequences selected from a one hour period of observation from automatized Webcam recordings with red to infrared-light. Egg deposition occurred in different positions, while the male accompanied the female in every action. (a) The male pushed gently the female's belly with its mouth to the desirable spawning substrate; (b) both fish were seen floating very close to each other after the male fertilized the eggs; (c) the second spawn of the female followed soon after first fertilization by the male; (d) male pushes the female again to another substrate near the first location of spawning; (e) the male immediately fertilizes the eggs; (f) the female deposits eggs for the last time in this series.
Figure 17 from: Yanwirsal H, Bartsch P, Kirschbaum F (2017) Reproduction and development of the asian bronze featherback Notopterus notopterus (Pallas, 1769) (Osteoglossiformes, Notopteridae) in captivity. Zoosystematics and Evolution 93(2): 299-324. https://doi.org/10.3897/zse.93.13341
Figure 17 - Juvenile transformation in Notopterus notopterus. (a) Stage 33: early juvenile in larger magnification, note the appearance of lateral line and short tubular nostrils, day 52; (b) Stage 34: stripe colored body of juvenile, day 70; (c) Stage 35: accentuated stripe pattern alongside the body, day 80; arrow points to the base of the developed translucent pectoral fin, barely visible; white arrowheads show the anterior nostrils; black arrowhead points to the genital papilla. Scale bar = 10 mm.
Figure 4 from: Yanwirsal H, Bartsch P, Kirschbaum F (2017) Reproduction and development of the asian bronze featherback Notopterus notopterus (Pallas, 1769) (Osteoglossiformes, Notopteridae) in captivity. Zoosystematics and Evolution 93(2): 299-324. https://doi.org/10.3897/zse.93.13341
Figure 4 - Elements of the courtship behaviour in Notopterus notopterus.(a) Around the spawning site the male touched the female's abdomen with his mouth; (b) the pair resting together on the bottom; (c and d) sequences of gravel removal/nesting site preparation by the male.
Figure 13 from: Yanwirsal H, Bartsch P, Kirschbaum F (2017) Reproduction and development of the asian bronze featherback Notopterus notopterus (Pallas, 1769) (Osteoglossiformes, Notopteridae) in captivity. Zoosystematics and Evolution 93(2): 299-324. https://doi.org/10.3897/zse.93.13341
Figure 13 - Stage 27, day 9; larger magnification (see also Fig. 12); Pfb– Pectoral fin buds; m– mesencephalon; lj– lower jaw; nch – notochord; Ao – aorta dorsalis; Vsi – vena subintestinalis; Vc – vena caudalis; af – anal fin; g – gills; h – heart; lev – left efferent vena vitellina; ys – yolk sac. Scale bar = 2 mm.
Figure 12 from: Yanwirsal H, Bartsch P, Kirschbaum F (2017) Reproduction and development of the asian bronze featherback Notopterus notopterus (Pallas, 1769) (Osteoglossiformes, Notopteridae) in captivity. Zoosystematics and Evolution 93(2): 299-324. https://doi.org/10.3897/zse.93.13341
Figure 12 - Hatching process and the free embryonic stages in Notopterus notopterus. (a) Stage 24: just hatched-embryo after breaking the weak egg envelope, caudal part is relieved, anterior part still stuck in the remnant of the egg-envelope, note the emergence of dorsal and caudal fin anlage; yolk sac (yc) still covered with egg envelope, 168h:05min; (b) Stage 25: rupture the complete egg-envelope and free anterior part of the embryo, 168h:25min; note the tiny pectoral fin bud (black arrowhead); (c) Stage 26: jaw and branchial arches formed, day 8; (d) Stage 27: mouth opening, day 10; note the emergence of the swim bladder vesicle (sb); white arrowheads point to gradual development of dorsal fin. Scale bar = 5 mm.
Figure 3 from: Yanwirsal H, Bartsch P, Kirschbaum F (2017) Reproduction and development of the asian bronze featherback Notopterus notopterus (Pallas, 1769) (Osteoglossiformes, Notopteridae) in captivity. Zoosystematics and Evolution 93(2): 299-324. https://doi.org/10.3897/zse.93.13341
Figure 3 - Course of the tested environmental factors during 331 days: conductivity (C), water level (WL) and temperature (T) in breeding tank II containing one female and one male Notopterus notopterus. Irregular spawning intervals were observed for 6 times within a 6-month experimental period. The breeding experiment was started after 40 days of acclimatization. Note the first swollen belly of the female (Arrow). *Asterisks refer to observed spawnings.
fig. 1 in First record of Osteoglossum bicirrhosum (Cuvier 1829) (Osteoglossiformes: Osteoglossidae) for the state of Maranhão, Brazil
fig. 1. (left) Osteoglossum bicirrhosum; CICCAA 03485 in the moment of capture.
fig. 3 in First record of Osteoglossum bicirrhosum (Cuvier 1829) (Osteoglossiformes: Osteoglossidae) for the state of Maranhão, Brazil
fig. 3. Collection site of the arawana fish O. bicirrhosum in the state of Maranhão, Brazil.
fig. 2 in First record of Osteoglossum bicirrhosum (Cuvier 1829) (Osteoglossiformes: Osteoglossidae) for the state of Maranhão, Brazil
fig. 2. (above) collection site: Igarapé Jatobazinho stream, Tocantins river basin.
Figure 3 in Distinction of two featherback species (Osteoglossiformes: Notopteridae) in India based on scale structure
Figure 3. Scanning electron microphotographs of the scale of (a – c) Chitala chitala (Hamilton) and (f – j) Notopterus notopterus (Pallas); a, f: anterior region; b, g: posterior region; d, i: radii; e, j: lateral line scale showing the details of lateral line canal. A. Annulus; AMC. anterior marginal circuli; AO. anterior opening of lateral line canal; C. circulus; LC. laterl circulus; LLC. lateral line canal; R. radii.
Figure 1 from: Yanwirsal H, Bartsch P, Kirschbaum F (2017) Reproduction and development of the asian bronze featherback Notopterus notopterus (Pallas, 1769) (Osteoglossiformes, Notopteridae) in captivity. Zoosystematics and Evolution 93(2): 299-324. https://doi.org/10.3897/zse.93.13341
Figure 1 - A female Notopterus notopterus, total length 23 cm, Scale bar = 2 cm.
Figure 1. a in Distinction of two featherback species (Osteoglossiformes: Notopteridae) in India based on scale structure
Figure 1. a. Chitala chitala (Hamilton); b. Notopterus notopterus (Pallas).
Figure 13 in Rediscovery and description of Paramormyrops sphekodes (Sauvage, 1879) and a new cryptic Paramormyrops (Mormyridae: Osteoglossiformes) from the Ogooué River of Gabon using morphometrics, DNA sequencing and electrophysiology
Figure 13. Variation in P. ntotom sp. nov. illustrated by five specimens from the Ogooué River: CUMV 96811 tag number JPS-1117, female, 117 mm; CUMV 98091 tag number JPS-1175, male 130 mm SL; CUMV 98092 tag number JPS-1176, male, 154 mm SL; CUMV 98134 tag number JPS-1185, male, 176 mm and CUMV 98136 tag number JPS-1187, male 165 mm.
Figure 15 in Rediscovery and description of Paramormyrops sphekodes (Sauvage, 1879) and a new cryptic Paramormyrops (Mormyridae: Osteoglossiformes) from the Ogooué River of Gabon using morphometrics, DNA sequencing and electrophysiology
Figure 15. EODs from (A) P. sphekodes from the Ogooué River, (B) P. curvifrons from the Ivindo River and (C) P. nototom sp. nov. from the Ogooué River. Each is plotted on the same time scale, all with head positivity upwards. (D) Scatter plot of EOD duration versus the ratio W1/W2 – the widths of the first and second phases of the EOD illustrated in Figs 10 and 14. EOD total duration and W1/W2 overlap for the allopatric pair, P. curvifrons and P. ntotom sp. nov., but not for the sympatric pair, P. sphekodes and P. ntotom sp. nov.
Figure 8 in Rediscovery and description of Paramormyrops sphekodes (Sauvage, 1879) and a new cryptic Paramormyrops (Mormyridae: Osteoglossiformes) from the Ogooué River of Gabon using morphometrics, DNA sequencing and electrophysiology
Figure 8. Electric organ discharges (EODs) from P. sphekodes. (A) Paramormyrops sphekodes specimen CUMV 98177 (tag JPS-1238), a male from type locality showing normalized voltage as a function of time, that is 1.0 V peak-to-peak. Head positivity is upwards on all traces. There are two peaks to the waveform: P1, which is head-positive, and P2, which is headnegative. EOD duration is measured between points marked by open circles – the first and last points exceed ±0.02 V. W1 and W2 are the widths of the first and second peaks. The thin line is a 20× vertical expansion of the waveform which rises gradually from the baseline with no indication of a head-negative pre-pulse, P0, that is present in some other species. The final overshoot, due to AC-coupling of the amplifier, is absent when making DC-coupled recordings. The dashed line indicates the zero baseline. (B) Time derivative, dV/dt, of EOD waveform in (A) has a single positive peak (arrow) in advance of peak P1 and there is no inflection point on the rising phase before P1. (C) EODs from nine specimens of P. sphekodes showing the stereotypy of the species waveform. After normalization to unity peak-to-peak height, all EODs are centred on the zero-crossing between P1 and P2 [zc in (A)]. Males are plotted in blue and females are plotted in red. (D) Power spectral density of EODs of P. sphekodes in (A) with its maximum power at 1125 Hz. Flow and Fhi are the frequencies where the spectral power drops 3 dB below the peak power of the FFT. The bandwidth of the power spectrum is Fhi–Flow. (E) Superimposed power spectra for the nine EODs shown in (C) with peak frequencies marked with 'x'. Axes units are as in D.
Figure 14 in Rediscovery and description of Paramormyrops sphekodes (Sauvage, 1879) and a new cryptic Paramormyrops (Mormyridae: Osteoglossiformes) from the Ogooué River of Gabon using morphometrics, DNA sequencing and electrophysiology
Figure 14. Electric organ discharges (EODs) from P. ntotom sp. nov. EOD waveforms plot voltage versus time. Voltage is normalized by setting the peak-to-peak voltage to 1.0 V. The time base is in (C). (A) EOD of holotype, CUMV 98138 tag number JPS-1189, male, SL 178 mm. The first peak, P1, is head-positive and the second, P2, is head-negative. Overall duration is 5.813 ms, measured between the two red dots. The 20× expanded trace (black) indicates the absence of a head-negative phase preceding P1. Abbreviations are as in Figure 10. (B) Time derivative of EOD shown in (A), indicating two points where dV/dt goes through a local maximum leading to inflection points in the EOD (dashed lines). (C) Superimposed EODs from 18 males (blue) and 13 females and juveniles (red) show a clear sex difference in EOD duration. (D) Power spectrum of the EOD of holotype, with magnitude measured in dB relative to the peak power plotted against frequency in Hz. Frequency at peak power indicated by F max. The frequencies where the magnitude of the power spectrum drops 3 dB below the peak power are indicated by Flow and Fhi. (E) Superimposed power spectra of traces shown in (C) demonstrate that spectral power emphasizes higher frequencies among females compared to males, as expected.
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