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287 results for “Danio”
Data from: Density and group size influence shoal cohesion, but not coordination in zebrafish (Danio rerio)
The formations made by gregarious animals can range from loose aggregates to highly synchronized and ordered structures. For very large, coordinated groups, both physical and social environments are important for determining the physical arrangement of individuals in the group. Here we tested whether physical and social factors are also important in determining the structure of small, loosely coordinated groups of zebrafish. We found that even though our fish were not crowded and did not use most of the available space, the distance between individual fish was explained primarily by the amount of available space (i.e., density). Zebrafish in a larger space spread out more and the total dimensions of the shoal were an additive function also of group size. We, however, did not find any impact of social or physical environment on the orientation of individual fish or shoal. Thus, both physical and social factors were important for shoal spatial arrangements, but not individual orientation and shoal alignment.
Data from: Ultraviolet B radiation alters movement and thermal selection of zebrafish (Danio rerio)
Temperature and ultraviolet B (UV-B) interact in causing cellular damage and impairing locomotor performance. Here, we test the hypothesis that movement and thermal selection of zebrafish (Danio rerio) change in the presence of UV-B, and in particular, that fish which were chronically exposed to UV-B avoid high and low temperature extremes to maximize activities of antioxidant enzymes. Fish chronically (two to three weeks) exposed to UV-B had increased reactive oxygen species (ROS)-induced damage to proteins and membranes, and reduced swimming performance at high (more than 26°C) temperatures. In an open field arena with a thermal gradient, chronically exposed fish avoided high and low temperature extremes compared with control fish. Additionally, both control and chronically exposed fish showed slower voluntary swimming speeds in the presence of UV-B. We suggest that in the presence of UV-B fish may reduce muscular activity to minimize intrinsic ROS production. Our data show that the interaction between UV-B and temperature determines movement and microhabitat selection of fish, which is therefore of ecological importance particularly in anthropogenically modified environments.
Data from: The effects of lateral line ablation and regeneration in schooling giant danios
Fish use multiple sensory systems, including vision and their lateral line system, to maintain position and speed within a school. Although previous studies have shown that ablating the lateral line alters schooling behavior, no one has examined how the behavior recovers as the sensory system regenerates. We studied how schooling behavior changes in giant danios Devario aequipinnatus when their lateral line system is chemically ablated and after the sensory hair cells regenerate. We found that fish could school normally immediately after chemical ablation, but that they had trouble schooling one to two weeks after the chemical treatment, when the hair cells had fully regenerated. We filmed groups of giant danios with two high-speed cameras and reconstructed the 3D positions of each fish within a group. One fish in the school was treated with gentamycin to ablate all hair cells. Both types of neuromasts, canal and superficial, were completely ablated after treatment but fully regenerated after one week. We quantified the structure of the school using nearest neighbor distance, bearing, elevation, and the cross-correlation of velocity between each pair of fish. Treated fish maintained a normal position within the school immediately after the lateral line ablation, but could not school normally one or two weeks after treatment, even though the neuromasts had fully regenerated. By four to eight weeks post-treatment, the treated fish could again school normally. These results demonstrate that the behavioral recovery after lateral line ablation is a longer process than the regeneration of the hair cells themselves.
FIGURE 2 in Danio aesculapii, a new species of danio from south-western Myanmar (Teleostei: Cyprinidae)
FIGURE 2. Danio aesculapii, holotype, NRM 44490, male, 22.5 mm SL; Myanmar: Rakhine State: Thandwe: Kananmae Chaung, near Leldee village.
FIGURE 4 in Danio aesculapii, a new species of danio from south-western Myanmar (Teleostei: Cyprinidae)
FIGURE 4. Danio aesculapii. Type locality. Myanmar: Rakhine State: Thandwe: Kananmae Chaung, near Leldee village. 20 March 1998.
FIGURE 1 in Danio aesculapii, a new species of danio from south-western Myanmar (Teleostei: Cyprinidae)
FIGURE 1. Danio aesculapii, drawing from Hora (1937: fig. 2), based on a 33 mm TL specimen from Thandwe.
FIGURE 3 in Danio aesculapii, a new species of danio from south-western Myanmar (Teleostei: Cyprinidae)
FIGURE 3. Danio aesculapii. Collecting sites. The Kyeintali locality at the extreme south is approximate.
FIGURE 8 in Description of Danio absconditus, new species, and redescription of Danio feegradei (Teleostei: Cyprinidae), from the Rakhine Yoma hotspot in south-western Myanmar
FIGURE 8. Principal Component Analysis of pooled morphometric data from Danio absconditus, D. feegradei, D. meghalayensis, and chain danios (D. assamila, D. catenatus, D. concatenatus, dangila, and D. sysphigmatus).
FIGURE 9 in Description of Danio absconditus, new species, and redescription of Danio feegradei (Teleostei: Cyprinidae), from the Rakhine Yoma hotspot in south-western Myanmar
FIGURE 9. Comparative morphometric analysis of Danio absconditus, D. feegradei, D. meghalayensis, and chain danios (D. assamila, D. catenatus, D. concatenatus, dangila, and D. sysphigmatus). a–d, box-and-whisker plots of proportional measurements (as per cents of standard length; e-f, proportional measurements (per cents of standard length) plotted against standard length, exposing differences in size allometry.
FIGURE 7 in Description of Danio absconditus, new species, and redescription of Danio feegradei (Teleostei: Cyprinidae), from the Rakhine Yoma hotspot in south-western Myanmar
FIGURE 7. Danio absconditus. One of the types, living individual photographed immediately after capture. Myanmar: Rakhine State, Comepyo Chaung.
FIGURE 6. Danio absconditus. Holotype, BMNH 2011.3.24.29, 51.7 in Description of Danio absconditus, new species, and redescription of Danio feegradei (Teleostei: Cyprinidae), from the Rakhine Yoma hotspot in south-western Myanmar
FIGURE 6. Danio absconditus. Holotype, BMNH 2011.3.24.29, 51.7 mm SL. Myanmar: Rakhine State, Comepyo Chaung.
FIGURE 5 in Description of Danio absconditus, new species, and redescription of Danio feegradei (Teleostei: Cyprinidae), from the Rakhine Yoma hotspot in south-western Myanmar
FIGURE 5. Map of southwestern part of Myanmar showing collecting localities of Danio absconditus and D. feegradei.
FIGURE 6 in Danio htamanthinus (Teleostei: Cyprinidae), a new species of miniature cyprinid fish from the Chindwin River in Myanmar
FIGURE 6. Phylogram of relationships from a Bayesian phylogenetic analysis of D. htamanthinus and related species, based on a 655 bp fragment of the mitochondrial COI gene. Internode values are Bayesian posterior probabilities. Sequences are tagged with Swedish Museum of Natural History voucher catalogue numbers (prefix NRM), GenBank sequence accession numbers (prefixed KT, KU, EF), or Barcode of Life identifier (prefix BOLD).
FIGURE 3 in Danio htamanthinus (Teleostei: Cyprinidae), a new species of miniature cyprinid fish from the Chindwin River in Myanmar
FIGURE 3. Myanmar, Sagaing Division, small stream near Htamanthi, type locality of Danio htamanthinus.
FIGURE 1 in Danio htamanthinus (Teleostei: Cyprinidae), a new species of miniature cyprinid fish from the Chindwin River in Myanmar
FIGURE 1. Danio htamanthinus: a, holotype, NRM 69502, male, 22.9 mm SL; Myanmar: Sagaing Division, stream close to Htamanthi village; b, paratype, NRM 42613. 16.8 mm SL; Myanmar: Sagaing Division: 5 km W Htamanthi village; c, paratype, NRM 42613, 16.8 mm SL, live colours immediately after capture.
FIGURE 2 in Danio htamanthinus (Teleostei: Cyprinidae), a new species of miniature cyprinid fish from the Chindwin River in Myanmar
FIGURE 2. Map of northern part of Myanmar showing collecting localities of Danio choprae, D. flagrans, and D. htamanthinus.
FIGURE 5 in Danio htamanthinus (Teleostei: Cyprinidae), a new species of miniature cyprinid fish from the Chindwin River in Myanmar
FIGURE 5. Principal Component Analysis of pooled morphometric data from Danio choprae (n=20), Danio flagrans (n=20) and D. htamanthinus (n=9). Plot of scores of Principal Component II (mainly variation in barbel lengths) on Component III (mainly lengths of maxillary barbel, anal-fin base and caudal peduncle).
FIGURE 4 in Danio htamanthinus (Teleostei: Cyprinidae), a new species of miniature cyprinid fish from the Chindwin River in Myanmar
FIGURE 4. Myanmar, Sagaing Division, small, flooded stream near Htamanthi, habitat of Danio htamanthinus, 1 December 2013.
Common molecular targets of a quinolone based bumped ki-nase inhibitor in Neospora caninum and Danio rerio
<p>Supplementary files for paper submitted to IJMS</p>
Data for Rates of warming impact oxidative stress in zebrafish (Danio rerio)
<p><span>Potentially negative effects of thermal variation on physiological functions may be modulated by compensatory responses, but their efficacy depends on the timescale of phenotypic adjustment relative to the rate of temperature change. Increasing temperatures in particular can affect mitochondrial bioenergetics and rates of reactive oxygen species (ROS) production. Our aim was to test whether different rates of temperature increase impact mitochondrial bioenergetics and modulate oxidative stress. We exposed zebrafish (<em>Danio rerio</em>) to warming from 20 to 28°C over 3, 6, 24, or 48 h, and compared these to a control group that was kept at constant 20°C. Fish exposed to the fastest (3 h) and slowest (48 h) rates of warming had significantly higher rates of H2O2 production relative to the control treatment, and the proportion of O2 converted to H2O2 (H2O2/O2 ratio) was significantly greater in these groups. However, ROS production was not paralleled by differences in mitochondrial substrate oxidation rates, leak respiration rates, or coupling (respiratory control ratios). Increased rates of ROS production did not lead to damage of proteins or membranes, which may be explained by a moderate increase in catalase activity at the fastest, but not the slowest rate of warming. The increase in ROS production at the slowest rate of heating indicates that even seemingly benign environments may be stressful<span>. </span>Understanding how animals respond to different rates of temperature change is important, because the rate<span> </span>determines the time period for phenotypic adjustments and it also alters the environmental<span> </span>thermal signal that triggers compensatory pathways.</span></p>
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
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OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.