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24 results for “Carassius auratus”
FIGURE 5 in Differential expression of HPG-axis genes in autotetraploids derived from red crucian carp Carassius auratus red var., × blunt snout bream Megalobrama amblycephala,
FIGURE 5 Mean (+SD) relative expression of gnrh2, fshb, lhb, fshr and lhr messenger (m)RNA in (a) the breeding season () 2n, and () 4n and (b) the non-breeding season in Carassius auratus red var. () 2n, and () 4n. (RCC,) and autotetraploid C. auratus red var. ♀ × Megalobrama amblycephala ♂ (4nRR,). T, gene detected in the testis; O, gene detected in the ovary. *, significant difference between RCC and 4nRR (P <0.05)
FIGURE 4 Deduced amino-acid sequences for the Gnrh2 in Differential expression of HPG-axis genes in autotetraploids derived from red crucian carp Carassius auratus red var., × blunt snout bream Megalobrama amblycephala,
FIGURE 4 Deduced amino-acid sequences for the Gnrh2 () and Lhr () genes in Carassius auratus red var. (RCC) and autotetraploid C. auratus red var. ♀ × Megalobrama amblycephala ♂ (4nRR)
FIGURE 2 in Differential expression of HPG-axis genes in autotetraploids derived from red crucian carp Carassius auratus red var., × blunt snout bream Megalobrama amblycephala,
FIGURE 2 (a) The mature eggs (scale bar = 100 μm) and (b) mature sperm (scale bar = 10 μm) of autotetraploid Carrasius auratus red var. ♀ x Megalobrama amblycephala ♂ (4nRR)
FIGURE 3 in Differential expression of HPG-axis genes in autotetraploids derived from red crucian carp Carassius auratus red var., × blunt snout bream Megalobrama amblycephala,
FIGURE 3 Reverse-transcription (RT)-PCR analysis of the expression of (a) gnrh2, (b) fshb, (c) lhb, (d) fshr and (e) lhr messenger (m)RNA in various tissues of autotetraploid Carrasius auratus red var. ♀ x Megalobrama amblycephala ♂ (4nRR). The upper strip of each panel (a)–(e) shows the positive control of actin gene while the lower strip of each panel shows the RT-PCR amplification of the target gene
FIGURE 1 in Differential expression of HPG-axis genes in autotetraploids derived from red crucian carp Carassius auratus red var., × blunt snout bream Megalobrama amblycephala,
FIGURE 1 The gonadal structure of Carassius auratus red var. [RCC; (a)–(c)] and autotetraploids C. auratus red var. ♀ × Megalobrama amblycephala ♂ [4nRR; (d)–(f)]: (a) ovary of 7 month-old RCC containing many phase II and a few phase III oocytes; (b) ovary of 12 month-old RCC showing many mature phase IV ova; (c) testis of 12 month-old RCC with numerous mature sperms () and a small amount of spermatocytes () in the lobules of testes; (d) ovary of 7 month-old 4nRR containing phase II and a few phase III oocytes; (e) ovary of 12 month-old 4nRR with numerous mature phase IV ova; (f) testis of 12 month-old 4nRR with numerous mature sperms () and a small amount of spermatocytes () in the lobules of testes, the scale bars: (a), (b), (d), and (e) = 100 μm; (c) and (f) = 10 μm
Distance estimation in the Goldfish (Carassius auratus)
<p>Neurophysiological advances have given us exciting insights into the systems responsible for spatial mapping in mammals. However, we are still lacking information on the evolution of these systems and whether the underlying mechanisms identified are universal across phyla, or specific to the species studied. Here we address these questions by exploring whether a species that is evolutionarily distant from mammals can perform a task central to mammalian spatial mapping – distance estimation. We developed a behavioural paradigm allowing us to test whether goldfish (<em>Carassius</em> <em>auratus</em>) can estimate distance and explored the behavioural mechanisms that underpin this ability. Fish were trained to swim a set distance within a narrow tank covered with striped pattern. After changing the background pattern, we found that goldfish use the spatial frequency of their visual environment to estimate distance; doubling the spatial frequency of the background pattern resulted in a large overestimation of the swimming distance. These results provide robust evidence that goldfish can accurately estimate distance, and show that they use local optic flow to do so. These results provide a compelling basis to utilise goldfish as a model system to interrogate the evolution of the mechanisms that underpin spatial cognition, from brain to behaviour.</p>
Distance estimation in the Goldfish (Carassius auratus)
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Fig. 2 in Breeding Potential Of Adventitious Species Of Carassius Auratus And Carassius Gibelio (Cypriniformes, Cyprinidae) In Water Bodies Of Ukraine
Fig. 2. Percentage ratio of hard roe and body weight of C. auratus and C. gibelio females.
Fig. 1 in Breeding Potential Of Adventitious Species Of Carassius Auratus And Carassius Gibelio (Cypriniformes, Cyprinidae) In Water Bodies Of Ukraine
Fig. 1. Individual fecundity of C. auratus and C. gibelio females in age groups.
Data from: Intraspecific scaling of the resting and maximum metabolic rates of the crucian carp (Carassius auratus)
The question of how the scaling of metabolic rate with body mass (M) is achieved in animals is unresolved. Here, we tested the cell metabolism hypothesis and the organ size hypothesis by assessing the mass scaling of the resting metabolic rate (RMR), maximum metabolic rate (MMR), erythrocyte size, and the masses of metabolically active organs in the crucian carp (Carassius auratus). The M of the crucian carp ranged from 4.5 to 323.9 g, representing an approximately 72-fold difference. The RMR and MMR increased with M according to the allometric equations RMR = 0.212M0.776 and MMR = 0.753M0.785. The scaling exponents for RMR (br) and MMR (bm) obtained in crucian carp were close to each other. Thus, the factorial aerobic scope remained almost constant with increasing M. Although erythrocyte size was negatively correlated with both mass-specific RMR and absolute RMR adjusted to M, it and all other hematological parameters showed no significant relationship with M. These data demonstrate that the cell metabolism hypothesis does not describe metabolic scaling in the crucian carp, suggesting that erythrocyte size may not represent the general size of other cell types in this fish and the metabolic activity of cells may decrease as fish grows. The mass scaling exponents of active organs was lower than 1 while that of inactive organs was greater than 1, which suggests that the mass scaling of the RMR can be partly due to variance in the proportion of active/inactive organs in crucian carp. Furthermore, our results provide additional evidence supporting the correlation between locomotor capacity and metabolic scaling.
FIGURE 3 in First report of some known Trichodinella epizootica Šramek-Hušek, 1953, and Tripartiella Lom, 1959 from the cultured Oranda Gold Fish (Carassius auratus auratus) in India
FIGURE 3. Microphotographs of Tripartiella species recovered from Carassius auratus auratus (L.). (A & B) Photomicrographs of silver nitrate impregnated adhesive discs of T. copiosa (Lom 1959) with its schematic diagram present in (C). (D & E) Showing the silver nitrate impregnated adhesive discs of T. obtusa (Ergens & Lom 1970) with its schematic diagram present in (F). Scale bars 10 µm.
FIGURE 1 in First report of some known Trichodinella epizootica Šramek-Hušek, 1953, and Tripartiella Lom, 1959 from the cultured Oranda Gold Fish (Carassius auratus auratus) in India
FIGURE 1. (A–D) Photomicrographs of silver nitrate impregnated adhesive discs of Trichodinella epizootica (Raabe 1950) Šramek-Hušek 1953 recovered from the gills of Carassius auratus auratus (L.). (E & F) Showing the diagrammatic drawings of the denticles of the specimens. Scale bars 10 µm.
FIGURE 2 in First report of some known Trichodinella epizootica Šramek-Hušek, 1953, and Tripartiella Lom, 1959 from the cultured Oranda Gold Fish (Carassius auratus auratus) in India
FIGURE 2. Microphotographs of Tripartiella bulbosa isolated from Carassius auratus auratus (L.) showing variation in appearance. (A & B) Showing the silver nitrate impregnated adhesive discs. Scale bars 10 µm (C & D) Showing the scanning electron micrographs of several Tripartiella bulbosa firmly attached to gill filaments. Scale Bar–1 µm. (E & F) Diagrammatic drawings of the denticles of the species obtained in present study.
FIGURE 4. A–F in First record of ectoparasitic ciliates, of genus Trichodina (Ciliophora: Trichodinidae) parasiting cultured Oranda Gold Fish (Carassius auratus auratus L.) in India
FIGURE 4. A–F Diagrammatic drawings of the denticles of Trichodinid species i.e. (A) Trichodina reticulata Hirschman and Partesh 1955 (B) Trichodina mutabilis Kazubski & Migala 1968 (C) Trichodina acuta Lom 1961 (D) Trichodina ngoma Van & Basson 1992 (E) Trichodina nandusi Mitra et al. 2013 (F) Trichodina domergui Wallengren 1897 obtain in the present study.
FIGURE 3. A–F in First record of ectoparasitic ciliates, of genus Trichodina (Ciliophora: Trichodinidae) parasiting cultured Oranda Gold Fish (Carassius auratus auratus L.) in India
FIGURE 3. A–F Photomicrographs of silver nitrate impregnated adhesive discs of Trichodinid species. (A) Trichodina reticulata Hirschman & Partesh 1955 (B) Trichodina mutabilis Kazubski & Migala 1968 (C) Trichodina acuta Lom 1961 (D) Trichodina ngoma Van & Basson 1992 (E) Trichodina nandusi Mitra et al. 2013 (F) Trichodina domergui Wallengren 1897 identified from Carassius auratus auratus (L.). Scale Bar–20 µm.
FIGURE 1 in First record of ectoparasitic ciliates, of genus Trichodina (Ciliophora: Trichodinidae) parasiting cultured Oranda Gold Fish (Carassius auratus auratus L.) in India
FIGURE 1. Schematic drawing of denticles of Trichodina magna Van As and Basson, 1989 to illustrate the sequence and method of the description of denticle elements, according to the method of Van As and Basson (1989). Abbreviations: abblade apex, abm—anterior blade margin (surface), ba—blade apophysis, bc—blade connection, ca—centre of adhesive disc, ccp—central conical part, cp—central part, dbm—distal blade margin (surface), dpc—deepest point of curve relative to apex, ira—indentation in lower central part, pbm—posterior blade margin (surface), pp—posterior projection, ra—ray apophysis, rc—ray connection, tp—tangent point.
FIGURE 3 in Trichodinids (Ciliophora: Peritrichida) parasitic on gills of freshwater fishes, Carassius auratus and Aristichthys nobilis from China, with the description of Trichodina subtilihamata sp. nov.
FIGURE 3. Diagrammatic drawing of the denticles of Trichodina spp. A–B. Trichodina subtilihamata sp. nov.; C: Trichodina uniforma Van As & Basson, 1989; D: Trichodina nigra Lom, 1960; E–F: Trichodina kazubski Van As & Basson, 1989; G–H: Trichodina mutabilis Kazubski & Migala, 1968.
FIGURE 2 in Trichodinids (Ciliophora: Peritrichida) parasitic on gills of freshwater fishes, Carassius auratus and Aristichthys nobilis from China, with the description of Trichodina subtilihamata sp. nov.
FIGURE 2. Photomicrographs of silver impregnated adhesive discs of Trichodina spp. A–B. Trichodina kazubski Van As & Basson, 1989; C–D: Trichodina mutabilis Kazubski & Migala, 1968. Scale bar = 20m.
FIGURE 1 in Trichodinids (Ciliophora: Peritrichida) parasitic on gills of freshwater fishes, Carassius auratus and Aristichthys nobilis from China, with the description of Trichodina subtilihamata sp. nov.
FIGURE 1. Photomicrographs of silver impregnated specimens of Trichodina spp. A–B. Trichodina subtilihamata sp. nov; C: Trichodina uniforma Van As & Basson, 1989; D: Trichodina nigra Lom, 1960. Scale bar = 20m.
Data from: Intraspecific scaling of the resting and maximum metabolic rates of the crucian carp (Carassius auratus)
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