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13 results for “swimbladder”
Figure 7. Digitized X in A study on European anchovy (Engraulis encrasicolus) swimbladder with some considerations on conventionally used target strength
Figure 7. Digitized X-ray image showing individuals having suitable or damaged/deflated swimbladder for image analyses.
Fig. 3 in Scientific Note Swimbladder abnormalities in piapara (Leporinus obtusidens) captured downstream of the Funil Dam
Fig. 3. Histological section of piapara Leporinus obtusidens swimbladder with sac-like projection (HE staining, 10x). a) hypertrophy and hyperplasia in the inner epithelium of the sac-like projection; b) normal cells in the inner swimbladder epithelium.
Fig. 2 in Scientific Note Swimbladder abnormalities in piapara (Leporinus obtusidens) captured downstream of the Funil Dam
Fig. 2. Histological section of piapara Leporinus obtusidens swimbladder (Masson trichromic staining, 10x). In a swimbladder with sac-like projection, the muscle layer (purple) was replaced by fibrous connective tissue (blue).
Fig. 1 in Scientific Note Swimbladder abnormalities in piapara (Leporinus obtusidens) captured downstream of the Funil Dam
Fig. 1. Urogenital opening of piapara Leporinus obtusidens. a) normal; b) the arrow indicates exposure of the posterior portion of the swimbladder; c) irregular coelomic cavity caused by swimbladder deformity without exteriorization. Swimbladder of piapara Leporinus obtusidens; d) normal; e) exposure of the posterior portion at the base of the anal fin opening; f) saclike projection without exteriorization.
Figure 1 in A study on European anchovy (Engraulis encrasicolus) swimbladder with some considerations on conventionally used target strength
Figure 1. An example showing the postprocessing image analyses of anchovy swimbladder.
Data from: Wall structure and material properties cause viscous damping of swimbladder sounds in the oyster toadfish Opsanus tau
Despite rapid damping, fish swimbladders have been modelled as underwater resonant bubbles. Recent data suggest that swimbladders of sound-producing fishes use a forced rather than a resonant response to produce sound. The reason for this discrepancy has not been formally addressed, and we demonstrate, for the first time, that the structure of the swimbladder wall will affect vibratory behaviour. Using the oyster toadfish Opsanus tau, we find regional differences in bladder thickness, directionality of collagen layers (anisotropic bladder wall structure), material properties that differ between circular and longitudinal directions (stress, strain and Young's modulus), high water content (80%) of the bladder wall and a 300-fold increase in the modulus of dried tissue. Therefore, the swimbladder wall is a viscoelastic structure that serves to damp vibrations and impart directionality, preventing the expression of resonance.
Fig. 4 in Swimbladder Evolution of Longfin Herrings (Pristigasteridae, Teleostei)
Fig. 4. Reconstruction of the evolution of post-coelomic diverticula within the Pristigasteridae. Ancestral conditions [no post coelomic extension (white), paired post-coelomic extensions (black) and single post coelomic extension (green)] at nodes reconstructed using a maximum likelihood method of ancestral character inference under the model "Mk1." Pie charts show likelihood support for ancestral habitat states (sum = 1) for the corresponding nodes. Note that the phylogenetic position of Chirocentrodon bleekerianus sister to Ilisha africana is not supported and additional data are needed to confidently resolve it. Classification is revised according to our results (see DISCUSSION).
Fig. 3 in Swimbladder Evolution of Longfin Herrings (Pristigasteridae, Teleostei)
Fig. 3. Maximum likelihood phylogenetic tree of Pristigasteridae. Coilia nasus is used to root the tree. Bootstrap proportions are indicated at nodes when> 65%. Branch lengths are proportional to number of substitutions. Generic classification follows Whitehead (1985). The specimen code of each specimen is indicated after its species name, followed by its geographic distribution (Indo-West Pacific [IWP] or East Atlantic or New World) and its subfamily assignment as established by Grande (1985) (Pritigasterinae [Prist.] or Pelloninae [Pellon.] or no subfamily). Fish illustrations Source: Whitehead (1985).
Fig. 1 in Swimbladder Evolution of Longfin Herrings (Pristigasteridae, Teleostei)
Fig. 1. Cladogram of pristigasterid fishes based on morphological characters (modified from Grande 1985). List of characters (reproduced from Grande, 1985): character 20: "Predorsal bones oriented either vertically or inclined anterodorsally"; character 21: "Loss of interlobar notch in third hypural of caudal skeleton"; character a: "Maxillarypremaxillary gap covered by bone"; character b: "Presence of a bony process on the first pleural rib which articulates with the shoulder girdle"; character c: "Loss of pelvic fin"; character d: "More than 23 predorsal bones"; character e: "More than 57 anal pterygiophores."
Data from: Wall structure and material properties cause viscous damping of swimbladder sounds in the oyster toadfish Opsanus tau
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Data from: The phylogenetics of Anguillicolidae (Nematoda: Anguillicolidea), swimbladder parasites of eels
BACKGROUND: Anguillicolidae Yamaguti, 1935 is a family of nematode parasites infecting fresh-water eels of the genus Anguilla, with five species in the genera Anguillicola and Anguillicoloides. Anguillicolidae is part of Spirurina, a diverse clade made up of only animal parasites. Anguillicoloides crassus is of particular importance, as it has recently spread from its endemic range in the Eastern Pacific to Europe and North America, where it poses a significant threat to new, naïve hosts such as the economic important eel species Anguilla anguilla and Anguilla rostrata. The Anguillicolidae are therefore all potentially invasive taxa, but the relationships of the described species remain unclear. RESULTS: We generated an extensive DNA sequence dataset from three loci (the 5' one-third of the nuclear small subunit ribosomal RNA, the D2-D3 region of the nuclear large subunit ribosomal RNA and the 5' half of the mitochondrial cytochrome c oxidase I gene) for the five species of Anguillicolidae and used this to investigate species and generic boundaries within the family, and the relationship of Anguillicolidae to other spirurine nematodes. Neither nuclear nor mitochondrial sequences supported monophyly of the genera Anguillicola and Anguillicoloides. Genetic diversity within the African species Anguillicoloides papernai was suggestive of cryptic taxa, as was the finding of divergent lineages of Anguillicoloides novaezelandiae in New Zealand and Tasmania. Phylogenetic analysis of the Spirurina grouped the Anguillicolidae together with members of the Gnathostomatidae and Seuratidae. CONCLUSIONS: The Anguillicolidae is part of a complex radiation of vertebrate parasitic nematodes with wide host diversity (cartilaginous and bony fish, reptiles and mammals), most closely related to other parasites of marine vertebrates that also have complex lifecycles. Molecular analyses do not support the recent division of Anguillicolidae into two genera. The described species may hide cryptic taxa, identified here by DNA taxonomy, and this DNA barcoding approach may assist in tracking species invasions. The propensity for host switching, and thus the potential for invasive behaviour, is found in A. crassus, A. novaezelandiae and A. papernai, and thus may be common to the group.
Figure 2 in A study on European anchovy (Engraulis encrasicolus) swimbladder with some considerations on conventionally used target strength
Figure 2. European anchovy (Engraulis encrasicolus): lateral (upper) and dorsal (lower) radiographs and the measurement steps shown on the same image. The swimbladder is the dark structure in the center of the body.
Data from: The phylogenetics of Anguillicolidae (Nematoda: Anguillicolidea), swimbladder parasites of eels
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