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162 results for “Brycon”
FIGURE 5 in Dispersion of hooks on the anal fins of primary and secondary males in Brycon orbignyanus (Characiformes: Bryconidae): a secondary sexual trait for breeder selection
FIGURE 5 | Phases of testes maturation in Brycon orbignyanus. A. Immature. B. Immature intersex. C. Regressing. D. Regenerating. E. Spawning Capable (primary male). F. Spawning Capable (secondary male). bv: blood vessels. cy: germ cell cysts. dge: discontinuous germinal epithelium. in: interstice. pg: primary growing oocyte. sg: spermatogonia. s: Sertoli cell. sz: sperm. tw: testis wall. va: vacuoles. Scales: A, C, D, E. 20 µm; B, F. 50 µm. Staining: Hematoxylin and Eosin.
FIGURE 3 in Dispersion of hooks on the anal fins of primary and secondary males in Brycon orbignyanus (Characiformes: Bryconidae): a secondary sexual trait for breeder selection
FIGURE 3 | Anal fin of Brycon orbignyanus without hooks. ca: callosity. fb: first fork. fr: first ray. sg: rays segment. sr: second ray. tb: terminal bifurcation. Scales: A. 0.5 cm; B. 200 µm; C. 100 µm.
FIGURE 6 in Dispersion of hooks on the anal fins of primary and secondary males in Brycon orbignyanus (Characiformes: Bryconidae): a secondary sexual trait for breeder selection
FIGURE 6 | Correlation between stages of the reproductive cycle and the number of rays with hooks in males of Brycon orbignyanus. X axis: Stages of the reproductive cycle, being, 0 – Immature specimens, 1 – Regressing, 2 – Regenerating specimens, 3 – Developing specimens, 4 – Spawning Capable specimens. Y axis: number (n°) of anal fin rays that developed hooks.
FIGURE 1 in Dispersion of hooks on the anal fins of primary and secondary males in Brycon orbignyanus (Characiformes: Bryconidae): a secondary sexual trait for breeder selection
FIGURE 1 | Anal fins in Brycon orbignyanus. A. Specimen of B. orbignyanus. B. Anal fin regions. C. Rays (r). D. Anal fin rays. af: anal fin. bi: bifurcation of rays. ca: caudal region. cr: cranial region. fr: first ray. im: interradial membrane. me: medial region. sg: radius segment. Scales: A. 5 cm; B and D. 1 cm; C. 200 µm.
FIGURE 2 in Dispersion of hooks on the anal fins of primary and secondary males in Brycon orbignyanus (Characiformes: Bryconidae): a secondary sexual trait for breeder selection
FIGURE 2 | Details regarding the fins of Brycon orbignyanus. A, C and E. Rays without hooks. B, D and F. Rays with hooks. b: base. fb: first fork. r: rays. rs: rays with hooks. s: hooks. sg: rays segment. st: hooks cusp. tb: terminal bifurcation. Scales: A and B. 1 cm; C and D. 200 µm; E. 100 µm; F. 50 µm.
Linked collectors and determiners for: A revision of the cis-andean species of the genus Brycon Müller & Troschel (Characiformes: Characidae).
Natural history specimen data linked to collectors and determiners held within, "A revision of the cis-andean species of the genus Brycon Müller & Troschel (Characiformes: Characidae)". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/9ea59a17-588e-4af1-8c0d-ebcd50ad0395">https://bionomia.net/dataset/9ea59a17-588e-4af1-8c0d-ebcd50ad0395</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/9ea59a17-588e-4af1-8c0d-ebcd50ad0395">https://gbif.org/dataset/9ea59a17-588e-4af1-8c0d-ebcd50ad0395</a>. Formatted as a Frictionless Data package.
Fig. 1 in Juveniles of the piscivorous dourado Salminus brasiliensis mimic the piraputanga Brycon hilarii as an alternative predation tactic
Fig. 1. Aggressive mimicry between the dourados Salminus brasiliensis and the piraputanga Brycon hilarii. Notice the resemblance in fins, general body colours and shape between the dourado (top) and the piraputanga (bottom) (a). Mixed school of about 30 cm total length piraputangas and dourados; the white circles point the similarity in caudal fin's colour in live individuals of both species (b). Juvenile dourados (black arrows) mimicking the piraputangas in a mixed school, both fishes were about 30 cm TL (c). Adult dourado preying a piraputanga; mimicry is expected to end when dourados are 0.3 times bigger than the piraputangas that they eat (d). Photos: JS (a and d), LNC (b and c).
Fig. 1 in Distribution of Agonostomus monticola and Brycon behreae in the Río Grande de Térraba, Costa Rica and relations with water flow
Fig. 1. Study area, the main River Térraba and Streams Ojochal, Caña Blancal and Brujo with the respective data recollection points.
Fig. 7 in Distribution of Agonostomus monticola and Brycon behreae in the Río Grande de Térraba, Costa Rica and relations with water flow
Fig. 7. Turbidity at the main River Térraba and the streams. The marked area is about October, when Térraba was less turbid than streams.
Fig. 6 in Distribution of Agonostomus monticola and Brycon behreae in the Río Grande de Térraba, Costa Rica and relations with water flow
Fig. 6. Capture per unit effort (CPUE) by month for Brycon behreae juveniles and adults in the Térraba River and three tributaries.
Fig. 3 in Distribution of Agonostomus monticola and Brycon behreae in the Río Grande de Térraba, Costa Rica and relations with water flow
Fig. 3. Capture per unit effort (CPUE) by month for Brycon behreae recruits in the Térraba River and three tributaries.
Fig. 4 in Distribution of Agonostomus monticola and Brycon behreae in the Río Grande de Térraba, Costa Rica and relations with water flow
Fig. 4. Capture per unit effort (CPUE) by month for Agonostomus monticola recruits in the Térraba River and three tributaries.
Fig. 2 in Microsatellite variation and population genetic structure of a neotropical endangered Bryconinae species Brycon insignis Steindachner, 1877: implications for its conservation and sustainable management
Fig. 2. UPGMA clustering of the Nei's genetic distance (1972) of the Brycon insignis sampling locations based on six microsatellite loci. Bootstrap values above 50% are shown above branches indicating percentage support in 5000 permutations. Power Company Hatchery (PCH), São João River (SJR), Paraíba do Sul River (PSR), Imbé River (IMR), Muriaé River (MUR) and Itabapoana River (ITR).
Fig. 2 in Distribution of Agonostomus monticola and Brycon behreae in the Río Grande de Térraba, Costa Rica and relations with water flow
Fig. 2. Month flow variation of study sites.
FIGURE 4 in A new species of Auriculostoma (Trematoda: Allocreadiidae) from the intestine of Brycon guatemalensis (Characiformes: Bryconidae) from the Usumacinta River Basin, Mexico, based on morphology and 28 S rDNA sequences, with a key to species of the genus
FIGURE 4. Testes shape of the three species of Auriculostoma in Middle-American characiforms: A) A. totonacapanensis (holotype) from Astyanax mexicanus: testes oblique, with entire (smooth) margins. B) A. astyanace (holotype) from A. aeneus: testes in tandem, with entire (smooth) margins. C) A. lobata n. sp. from Brycon guatemalensis, Usumacinta River, Chiapas, Mexico, and D) A. lobata n. sp. from B. guatemalensis, Tenosique, Tabasco, Mexico: testes in tanden, with deeply lobated testes.
FIGURE 3. Phylogram representing a in A new species of Auriculostoma (Trematoda: Allocreadiidae) from the intestine of Brycon guatemalensis (Characiformes: Bryconidae) from the Usumacinta River Basin, Mexico, based on morphology and 28 S rDNA sequences, with a key to species of the genus
FIGURE 3. Phylogram representing a hypothesis for the relationships of Auriculostoma lobata n. sp. with other allocreadiids. The tree represents the single best tree obtained from maximum likelihood analysis based on 28S rDNA sequences from allocreadiids and rooted using species of Prosthenhystera (Callodistomidae). Numbers near internal nodes indicate bootstrap support values (*= values 100%).
FIGURE 1. Auriculostoma lobata n in A new species of Auriculostoma (Trematoda: Allocreadiidae) from the intestine of Brycon guatemalensis (Characiformes: Bryconidae) from the Usumacinta River Basin, Mexico, based on morphology and 28 S rDNA sequences, with a key to species of the genus
FIGURE 1. Auriculostoma lobata n. sp. (A) Ventral view of holotype. Scale bar = 500 µm. (B) Ventral view of ovarian complex of paratype. Scale bar = 100 µm. (C) Ventral view of terminal genitalia showing that the ejaculatory duct and the uterus open to the genital atrium (reconstruction made from the observation of several specimens). Scale bar = 500 µm. (D) Detail of the anterior and posterior testes of paratype. Scale bar = 500 µm. Abbreviations: AT= anterior testis, CS= cirrus sac, ED= ejaculatory duct, Eg= eggs, ES= esophagus, GA= genital atrium, GP= genital pore, MG= Mehlis´gland, OS= oral sucker, OU= opening of the uterus into genital atrium, Ov= ovary, PH= pharynx, PP= pars prostatica, PT= posterior testis, SR= seminal receptacle, SV= seminal vesicle, Ut= uterus, VF= vitelline follicles, VS= ventral sucker, VR= vitelline reservoir.
FIGURE 3 in A new species of Brycon (Characiformes: Characidae) from Nicaragua and Costa Rica, with a key to the lower Mesoamerican species of the genus
FIGURE 3. (A) Map of lower Central America, showing known distribution of Brycon costaricenses (light area); (B, C) typelocality (D, E) indicated by the star, circles represent remaining localities.
FIGURE 4. A in A new species of Brycon (Characiformes: Characidae) from Nicaragua and Costa Rica, with a key to the lower Mesoamerican species of the genus
FIGURE 4. A. Scatter plot of the first two axis of the CVA of the body shape for three Central American Brycon species (circles=B. guatemalensis, squares=B. behreae, equis=B. costaricensis). Deformation grids indicate extreme shape along CV axes (B=CV1-, C=CV1+, D=CV2-, E=CV2+).
FIGURE 1 in A new species of Brycon (Characiformes: Characidae) from Nicaragua and Costa Rica, with a key to the lower Mesoamerican species of the genus
FIGURE 1. Landmarks: (1) rostral tip of premaxilla, (2) posterior end of nuchal spine, (3) anterior insertion of dorsal fin, (4) posterior insertion of dorsal fin, (5) anterior insertion of adipose fin, (6) dorsal insertion of caudal fin, (7) midpoint of caudal border of hypural plate, (8) ventral insertion of caudal fin, (9) posterior insertion of anal fin, (10) anterior insertion of anal fin, (11) dorsal base of pelvic fin, (12) dorsal base of pectoral fin, (13) dorsal end of opercle, (14) postero-ventral margin of preopercle, (15) posterior end of maxilla, (16) center of eye.
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