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50 results for “caudal fin”
Caudal fin area: body length ratio (A:L 2; mean..) FIGURE 5 CF s S E measured from photographs of Salmo trutta parr at 20 and 32 weeks after exercise treatment initiation. A:L 2 values between the two CF s groups were significantly different (Welch's two sample t- test p <0.05) in Body shape and robustness response to water flow during development of brown trout Salmo trutta parr
Caudal fin area: body length ratio (A:L 2; mean..) FIGURE 5 CF s S E measured from photographs of Salmo trutta parr at 20 and 32 weeks after exercise treatment initiation. A:L 2 values between the two CF s groups were significantly different (Welch's two sample t- test p <0.05)
Text-fig. 2. The methods of measurements. H – horizontal plane, HB – body height, SL – skull length, TL – total body length, 1 – the angle which the dorsal lobe of the caudal fin forms with the horizontal plane, 2 – the angle which the ventral lobe of the caudal fin forms with the horizontal plane, 3 – the angle which the scale row in front of the anal fin forms with the horizontal plane. in Actinopterygians Of The Broumov Formation (Permian) In The Czech Part Of The Intra-Sudetic Basin (The Czech Republic)
Text-fig. 2. The methods of measurements. H – horizontal plane, HB – body height, SL – skull length, TL – total body length, 1 – the angle which the dorsal lobe of the caudal fin forms with the horizontal plane, 2 – the angle which the ventral lobe of the caudal fin forms with the horizontal plane, 3 – the angle which the scale row in front of the anal fin forms with the horizontal plane.
Text-fig. 17. Aeduellidae. Scale bars 5 mm. a: the scales of oblong shape on the lateral side of the body, locality Otovice "Stěnava", DP 4307, whitened; b: drawing of the scales with fine denticles on their posterior edge, locality Otovice "Stěnava", DP 4307; c, d: drawing and photograph (whitened) of the scales of lateral side of the body, two times large scales occur in the rows 14, 16, 17, 19 (they are marked with arrows), locality Otovice "Černý potok", NM-M 4912; e: lepidotrichia of the anal fin with sigmoidal sutures between the segments (marked by arrows), locality Otovice, NM-M 4931, whitened; f: anterior edge of the dorsal fin and lepidotrichia with sigmoidal sutures between the segments, locality Otovice "Stěnava", DP 4307, whitened; g: anterior edge of the ventral lobe of the caudal fin, locality Otovice, NM-M 4931, whitened; h: the caudal peduncle with begin of bifurcation of the dorsal and ventral lobes of the caudal fin, locality Otovice, NM-M 4931. in Actinopterygians Of The Broumov Formation (Permian) In The Czech Part Of The Intra-Sudetic Basin (The Czech Republic)
Text-fig. 17. Aeduellidae. Scale bars 5 mm. a: the scales of oblong shape on the lateral side of the body, locality Otovice "Stěnava", DP 4307, whitened; b: drawing of the scales with fine denticles on their posterior edge, locality Otovice "Stěnava", DP 4307; c, d: drawing and photograph (whitened) of the scales of lateral side of the body, two times large scales occur in the rows 14, 16, 17, 19 (they are marked with arrows), locality Otovice "Černý potok", NM-M 4912; e: lepidotrichia of the anal fin with sigmoidal sutures between the segments (marked by arrows), locality Otovice, NM-M 4931, whitened; f: anterior edge of the dorsal fin and lepidotrichia with sigmoidal sutures between the segments, locality Otovice "Stěnava", DP 4307, whitened; g: anterior edge of the ventral lobe of the caudal fin, locality Otovice, NM-M 4931, whitened; h: the caudal peduncle with begin of bifurcation of the dorsal and ventral lobes of the caudal fin, locality Otovice, NM-M 4931.
Text-fig. 10. Progyrolepis heyleri POPLIN, 1999. a: dorsal lobe of the caudal fin with the fulcral scales along the dorsal edge of the lobe, GMC 55, whitened, scale bar 5 mm; b: basal fulcral scales from the dorsal edge of the caudal peduncle, G 123, whitened, scale bar 5 mm; c: fragment of the body of juvenile specimen with dorsal and anal fins, GMC 11, whitened, scale bar 5 mm; d: isolated scales from lateral side of the body, G 123, whitened, scale bar 5 mm; e: ridges on the scale surface, the frame delineates the area illustrated in (f) at higher magnification, G 123, scale bar 500 µm; f: details of the surface with microtubercles, scale bar 50 µm; g: isolated lepidotrichium of an adult specimen with very short and wide segments and with unsegmented basal part, GMC 101, whitened, scale bar 5 mm; h: large conical teeth from the internal row of the maxilla, G 123, scale bar 2 mm; i: microsculpture formed by elliptical proximo-distally elongated protuberances on the large conical tooth, G 123, scale bar 100 µm; j: large conical tooth from the internal row of the maxilla, G 123, scale bar 2 mm; k: microsculpture formed by elliptical proximo-distally elongated protuberances on the large conical tooth, G 123, scale bar 100 µm. in New Actinopterygians From The Permian Of The Brive Basin, And The Ichthyofaunas Of The French Massif Central
Text-fig. 10. Progyrolepis heyleri POPLIN, 1999. a: dorsal lobe of the caudal fin with the fulcral scales along the dorsal edge of the lobe, GMC 55, whitened, scale bar 5 mm; b: basal fulcral scales from the dorsal edge of the caudal peduncle, G 123, whitened, scale bar 5 mm; c: fragment of the body of juvenile specimen with dorsal and anal fins, GMC 11, whitened, scale bar 5 mm; d: isolated scales from lateral side of the body, G 123, whitened, scale bar 5 mm; e: ridges on the scale surface, the frame delineates the area illustrated in (f) at higher magnification, G 123, scale bar 500 µm; f: details of the surface with microtubercles, scale bar 50 µm; g: isolated lepidotrichium of an adult specimen with very short and wide segments and with unsegmented basal part, GMC 101, whitened, scale bar 5 mm; h: large conical teeth from the internal row of the maxilla, G 123, scale bar 2 mm; i: microsculpture formed by elliptical proximo-distally elongated protuberances on the large conical tooth, G 123, scale bar 100 µm; j: large conical tooth from the internal row of the maxilla, G 123, scale bar 2 mm; k: microsculpture formed by elliptical proximo-distally elongated protuberances on the large conical tooth, G 123, scale bar 100 µm.
Figure 1 in The pattern of the mechanosensory lateral line on the caudal fin of the two deep-water gobiid fishes Deltentosteus collonianus and Deltentosteus quadrimaculatus (Teleostei: Gobiidae)
Figure 1. Stylized pattern of the lateral line system of the caudal fin in Gobiidae with different numbers of neuromast rows: (A) plesiomorphic pattern; (B–D) advanced pattern. (A) Three longitudinal rows, Gobius niger; (B) four longitudinal neuromast rows, Deltentosteus quadrimaculatus; (C) six longitudinal neuromast rows, Deltentosteus collonianus; (D) eight longitudinal neuromast rows, Aphia minuta. (C, D) Neuromasts of lcd, lcm, and lcv are shown enlarged. In most Gobiidae, the neuromasts decrease in size rearwards, as shown in (A) only. lcd, dorsal longitudinal row; lcm, medial longitudinal row; lct, transversal row; lcv, ventral longitudinal row.
Data from: Modulation of yaw stability with an unstable rigid body and a stabilising caudal fin in the yellow boxfish (Ostracion cubicus)
<p>Despite that boxfishes have a rigid carapace that restricts body undulation, they are highly manoeuvrable and manage to swim with remarkably dynamic stability. Recent research has indicated that the rigid body shape of boxfishes shows an inherently unstable response in its rotations caused by course-disturbing flows. Hence, any net stabilising effect should come from the fish's fins. The aim of the current study was to determine the effect of the surface area and orientation of the caudal fin on the yaw torque exerted on the yellow boxfish, <i>Ostracion cubicus</i>, a square cross-sectional shaped species of boxfish. Yaw torques quantified in a flow tank using a physical model with an attachable closed or open caudal fin at different body and tail angles and at different water flow speeds showed that the caudal fin is crucial for controlling yaw. These flow tank results were confirmed by computational fluid dynamics simulations. The caudal fin therefore acts as both a stabiliser and rudder for the naturally unstable rigid body with regard to yaw. Boxfishes seem to use the interaction of the unstable body and active changes in the shape and orientation of the caudal fin to modulate manoeuvrability and stability.</p>
Data from: Modulation of yaw stability with an unstable rigid body and a stabilising caudal fin in the yellow boxfish (Ostracion cubicus)
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FIGURE 10 in Intraspecific variation of the caudal fin skeleton in Osteoglossum bicirrhosum Cuvier 1829 (Teleostei: Osteoglossomorpha: Osteoglossidae)
FIGURE 10. Caudal skeleton of Osteoglossum bicirrhosum as figured by: a) Taverne (1977); b) Hilton (2003); c) and d) Greenwood (1967). All illustrations are redrawn from these authors.
FIGURE 6 in Intraspecific variation of the caudal fin skeleton in Osteoglossum bicirrhosum Cuvier 1829 (Teleostei: Osteoglossomorpha: Osteoglossidae)
FIGURE 6. Caudal skeleton of Osteoglossum bicirrhosum. Specimens: a) UERJ-PMB 24; b) UERJ-PMB 31; c) MZUSP uncatalogued specimen. Anterior faces left.
FIGURE 9 in Intraspecific variation of the caudal fin skeleton in Osteoglossum bicirrhosum Cuvier 1829 (Teleostei: Osteoglossomorpha: Osteoglossidae)
FIGURE 9. Normal and teratological specimens of Osteoglossum bicirrhosum: a) caudal region of normal specimen before and after preparation with dermestid beetles (UERJ-PMB 48); arrows indicate caudal peduncle; b) caudal region of teratological specimen, with dorsal, caudal and anal fins confluent, before and after preparation with dermestid beetles
FIGURE 3 in Intraspecific variation of the caudal fin skeleton in Osteoglossum bicirrhosum Cuvier 1829 (Teleostei: Osteoglossomorpha: Osteoglossidae)
FIGURE 3. Caudal skeleton of Osteoglossum bicirrhosum. Specimens: a) MZUSP 3526-d; b) MZUSP 82312-18622; c) MZUSP 82331-02; d) MZUSP 22080-01; e) UERJ-PMB 25; f) MZUSP 21875-02. Bone is shown in white, and cartilage in black. Anterior faces left.
FIGURE 1. a in Intraspecific variation of the caudal fin skeleton in Osteoglossum bicirrhosum Cuvier 1829 (Teleostei: Osteoglossomorpha: Osteoglossidae)
FIGURE 1. a) The bonytongue Osteoglossum bicirrhosum, MNRJ 1212 (306 mm SL); b) Map with the geographic distribution of the specimens examined in the present study: I. Overview of South America river drainages. The spots represent specimen localities found in the MNRJ – Neodat search page; II. Close showing the localities in the sampled area. Assigned numbers depicted in Annex 1; III. Detail of the three sub-basins with the localities of the specimens used in our geographical comparisons. Maps were composed based on the online maps from IBGE (Instituto Brasileiro de Geografia e Estatística) and from the Neodat Project – MNRJ page.
FIGURE 5 in Intraspecific variation of the caudal fin skeleton in Osteoglossum bicirrhosum Cuvier 1829 (Teleostei: Osteoglossomorpha: Osteoglossidae)
FIGURE 5. Caudal skeleton of Osteoglossum bicirrhosum. Specimens: a) UERJ-PMB 11; b) UERJ-PMB 12; c) UERJ- PMB 13; d) UERJ-PMB 14. Bone is shown in white, and cartilage in black. Anterior faces left.
FIGURE 8 in Intraspecific variation of the caudal fin skeleton in Osteoglossum bicirrhosum Cuvier 1829 (Teleostei: Osteoglossomorpha: Osteoglossidae)
FIGURE 8. Caudal skeleton of Osteoglossum bicirrhosum: a) "Typical" condition. ["A"]. b) Schematic drawings of the main patterns ["A", "B", "C", "D", "E" and "F"] found in specimens from the three selected localities [Negro, Trombetas and Tapaj®AEs rivers]. Varying structures are highlighted in blue. Bone is shown in white, and cartilage in black. Anterior faces left. c) Histograms showing the distribution [expressed in percentage] of the varying endoskeletal patterns in specimens from the three localities.
FIGURE 2 in Intraspecific variation of the caudal fin skeleton in Osteoglossum bicirrhosum Cuvier 1829 (Teleostei: Osteoglossomorpha: Osteoglossidae)
FIGURE 2. Caudal skeleton of Osteoglossum bicirrhosum. Specimens: a) MZUSP 82312-18630; b) MZUSP 82319- 30738; c) MZUSP 3526-e; d) MZUSP 82312-18618; e) MZUSP 82312-18623; f) MZUSP 18290-d. Anterior faces left.
FIGURE 8. Caudal fin elements from third pre-ural centrum. A. Archamia bleekeri, USNM 356291, 37.6 in A new genus of cardinalfish (Apogonidae: Percomorpha), redescription of Archamia and resemblances and relationships with Kurtus (Kurtidae: Percomorpha)
FIGURE 8. Caudal fin elements from third pre-ural centrum. A. Archamia bleekeri, USNM 356291, 37.6 mm SL. B. Taeniamia leai, USNM 306823, 55.0 mm SL, only cleared and stained. C. Kurtus indicus, USNM 267150, 63.0 mm SL. D. Kurtus gulliveri, USNM 217309, ~50 mm SL. Numbers refer to upper and lower procurrent (5–14) and principle caudal-fin rays (8–9). terminal centrum = ct, epural = e, = hypural = h, neural crest = nc, = neural spine = ns, parhypural = p, preural centrum = pu, urostylar sheath = us = paired uroneurals = u, fused elements = +, paired uroneurals in solid black, cartilage in gray. Scale = 1 mm.
Fig 4. Caudal fin. a. A in Amblyceps waikhomi, a New Species of Catfish (Siluriformes: Amblycipitidae) from the Brahmaputra Drainage of Arunachal Pradesh, India
Fig 4. Caudal fin. a. A. mangois (RGUMF unregistered, 45.2 mm SL), b. A. arunachalensis (RGUMF 117, 85.1 mm SL), and c. A. waikhomi (RGUMF 269, 40.2 mm SL). (Parphypural may be separated from
FIGURE 4 in A new species of Schindler's fish (Teleostei: Gobiidae: Schindleria) from the Malay Archipelago (Southeast Asia), with notes on the caudal fin complex of Schindleria
FIGURE 4. Schindleria macrodentata sp. nov. A—Holotype. Head in lateral view; note the large teeth on the upper (premaxilla) and lower (dentary) jaws; arrow points to the damaged branchiostegal area; the maxillary is broken (position of star). B—Paratype. Head in ventral view. Note that the lower jaw forms a narrow and pointed arch; the arrow points to two detached branchiostegal rays. C—Holotype. Lateral view of the transition from the abdominal area (right) to the tail (left). Note row of small eggs (highlighted in dark brown). Arrow points to urogenital opening. Transparent skin ventral to the gut is detached due to preservation. D—Paratype. Head in ventral view. Crystals are artifacts and remnants of the original preservation liquid (formaldehyde). Scale bar = 0.5 mm.
FIGURE 5 in A new species of Schindler's fish (Teleostei: Gobiidae: Schindleria) from the Malay Archipelago (Southeast Asia), with notes on the caudal fin complex of Schindleria
FIGURE 5. Schindleria macrodentata sp. nov. Holotype. Head in dorsal view. Note the large teeth on the upper (premaxilla) and lower (dentary) jaws. White arrow points to the elongated and narrow pectoral fin base. Scale bar = 0.5 mm.
FIGURE 2 in A new species of Schindler's fish (Teleostei: Gobiidae: Schindleria) from the Malay Archipelago (Southeast Asia), with notes on the caudal fin complex of Schindleria
FIGURE 2. Schindleria macrodentata sp. nov. Holotype, ZMUC 77624, female, SL 16.5 mm; Indonesia, Molucca Sea, 00°29′N, 125°54′E; 28 March 1929. Scale bar = 2 mm.
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