Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
36
datasets available to search
ShareScore release 0.9.0
Dataset results
36 results for “Weakly electric fish”
Fig. 3. A in Sperm ultrastructure in three different families of weakly electric fishes (Teleostei: Gymnotiformes)
Fig. 3. A: Spermatozoon of Eigenmannia trilineata (SEM), h = sperm head, arrow = flagellum, double arrow = midpiece, m = mitochondrion; B, E: Spermatozoa of E. trilineata in longitudinal section (TEM) showing ovoid nucleus (n) with flocculent chromatin, centriolar arrangement (dc= distal centriole, pc= proximal centriole), and elongate mitochondria (m), v = vesicles; C: Flagella of spermatozoa of E. trilineata in cross sections (TEM) showing axonemal or flagellar fins (af); D: Midpiece of spermatozoa of E. trilineata in cross section (TEM) showing presence of vesicles (v) and mitochondria (m), and flagellar axoneme (a) with electron-lucent tubules of each peripheral doublet. Scale bars = 1µm.
Fig. 2. A in Sperm ultrastructure in three different families of weakly electric fishes (Teleostei: Gymnotiformes)
Fig. 2. A: Spermatozoon of Gymnotus aff. carapo (SEM), h = sperm head, arrow = flagellum, double arrow = midpiece; B-C: Spermatozoa of G.aff. carapo in longitudinal section (TEM) showing spherical nucleus (n), centriolar complex and flagellum (f) lateral to the nucleus (n), double nuclear fossa (double arrow), centriolar arrangement (dc= distal centriole, pc= proximal centriole), mitochondria (m), and presence of vesicles (v) in the posterior portion of midpiece, cc = cytoplasmic canal; D: Flagella of spermatozoa of G. aff. carapo in cross section (TEM) showing electron-lucent tubules of each peripheral doublet (arrow); E: Midpiece of spermatozoon of G.aff. carapo in longitudinal section (TEM) showing short cytoplasmatic canal (cc) and vesiclular arrangement (v). Scale bars = 1µm.
Raw sequencing data of NGS of stomach contents of sympatric species of weakly electric fish (genus: Campylomormyrus)
<p>This dataset contains the raw sequencing data of stomach contents of sympatric species of weakly electric fish (genus: <em>Campylomormyrus</em>) using next generation sequencing.</p> <p>Stomach content samples were collected from five <em>Campylomormyrus</em> species (<em>C. alces</em>, ; <em>C. compressirostris</em>, ; <em>C. curvirostris</em>, ; <em>C. numenius</em>, ; <em>C. tshokwe</em>) and samples of <em>Gnathonemus petersii</em> (<em>G. petersii, </em>), a sister genus of <em>Campylomormyrus.</em></p> <p>The fish specimens, from which these stomach content samples are extracted, were collected during an expedition to the Republic of the Congo in fall 2012.</p> <p>The dataset files are in FASTA format.</p>
A new genome of an African weakly electric fish (Campylomormyrus compressirostris, Mormyridae) indicates rapid gene family evolution in Osteoglossomorpha
Background <p>Teleost fishes comprise more than half of the vertebrate species. Within teleosts, most phylogenies consider the split between Osteoglossomorpha and Euteleosteomorpha/Otomorpha as basal, preceded only by the derivation of the most primitive group of teleosts, the Elopomorpha. While Osteoglossomorpha are generally species-poor, the taxon contains the African weakly electric fish (Mormyroidei), which have radiated into numerous species. Within the mormyrids, the genus <em>Campylomormyrus</em> is mostly endemic to the Congo Basin. <em>Campylomormyrus</em> serves as a model to understand mechanisms of adaptive radiation and ecological speciation, especially with regard to its highly diverse species-specific electric organ discharges (EOD). Currently, there are few well-annotated genomes available for electric fish in general and mormyrids in particular. Our study aims at producing a high-quality genome and to use this to examine genome evolution in relation to other teleosts. This will facilitate further understanding of the evolution of the osteoglossomorph fish in general and of electric fish in particular.</p> Results <p>A high-quality weakly electric fish (<em>C. compressirostris</em>) genome was produced from a single individual with a genome size of 862Mb, consisting of 1,497 contigs with an N50 of 1,399 kb and a GC-content of 43.69%. Gene predictions identified 34,492 protein-coding genes, which is a higher number than in the two other available Osteoglossomorpha genomes of <em>Paramormyrops</em> <em>kingsleyae</em> and <em>Scleropages</em> <em>formosus</em>. A CAFE5 analysis of gene family evolution comparing 33 teleost fish genomes suggests an overall faster gene family turnover rate in Osteoglossomorpha than in Otomorpha and Euteleosteomorpha. Moreover, the ratios of expanded/contracted gene family numbers in Osteoglossomorpha are significantly higher than in the other two taxa, except for species that had undergone an additional genome duplication (<em>Cyprinus</em> <em>carpio</em> and <em>Oncorhynchus</em> <em>mykiss</em>). As potassium channel proteins are hypothesized to play a key role in EOD diversity among species, we put a special focus on them, and manually curated 16 Kv1 genes. We identified a tandem duplication in the KCNA7a gene in the genome of <em>C</em>. <em>compressirostris</em>.</p> Conclusions <p>We present the fourth genome of an electric fish and the third well-annotated genome for Osteoglossomorpha, enabling us to compare gene family evolution among major teleost lineages. Osteoglossomorpha appears to exhibit rapid gene family evolution, with more gene family expansions than contractions. The curated Kv1 gene family showed seven gene clusters, which is more than in other analyzed fish genomes outside Osteoglossomorpha. The KCNA7a, encoding for a potassium channel central for EOD production and modulation, is tandemly duplicated which may related to the diverse EOD observed among <em>Campylomormyrus</em> species.</p>
A new genome of an African weakly electric fish (Campylomormyrus compressirostris, Mormyridae) indicates rapid gene family evolution in Osteoglossomorpha
Open the record for dataset details and reuse information.
FIGURE 15 in African weakly electric fishes of the genus Petrocephalus (Osteoglossomorpha: Mormyridae) of Odzala National Park, Republic of the Congo (Lékoli River, Congo River basin) with description of five new species
FIGURE 15. Petrocephalus phylogeny (17 species, 59 specimens, 53 haplotypes) estimated by maximum likelihood using complete cytochrome b sequences (dataset #1; see text). Gnathonemus petersii, Mormyrops nigricans and Myomyrus macrops were used as outgroups to root the tree. Numbers at internal branches are bootstrap proportions (in %) shown only when they exceed 50%. Due to space limitations, support values are not shown for intraspecific relationships. Black vertical bars to the right of the tree indicate specimens sampled from Odzala. White bars (with the river basins from which the specimens were collected) indicate Petrocephalus individuals from other regions of Africa. The scale bar corresponds to 0.04 substitutions per site.
FIGURE 9 in African weakly electric fishes of the genus Petrocephalus (Osteoglossomorpha: Mormyridae) of Odzala National Park, Republic of the Congo (Lékoli River, Congo River basin) with description of five new species
FIGURE 9. Petrocephalus christyi of the Lékoli River system of Odzala National Park, Republic of the Congo. A. Photograph of a live specimen (no scale). B. Photograph of a preserved specimen (scale bar = 1.0 cm). C. EOD waveforms. One EOD was arbitrarily selected from each of two recorded individuals, and they were superimposed together. Both EODs are scaled to the same peak-to-peak voltage, and they are plotted (head-positive up) on the same time scale as an overlay centered on the largest positive peak (scale bar = 0.2 msec).
FIGURE 11. Petrocephalus pulsivertens n in African weakly electric fishes of the genus Petrocephalus (Osteoglossomorpha: Mormyridae) of Odzala National Park, Republic of the Congo (Lékoli River, Congo River basin) with description of five new species
FIGURE 11. Petrocephalus pulsivertens n. sp. of the Lékoli River system of Odzala National Park, Republic of the Congo. A. Photograph of a live specimen (no scale). B. Photograph of the preserved holotype (CU 88085; scale bar = 1.0 cm). C. EOD waveforms. One EOD was arbitrarily selected from each recorded individual and superimposed with the other recordings (N = number of individuals). All EODs are scaled to the same peak-to-peak voltage, and they are plotted (head-positive up) on the same time scale as overlays centered on the largest positive peak of each waveform (scale bar = 0.2 msec).
FIGURE 13. Petrocephalus mbossou n in African weakly electric fishes of the genus Petrocephalus (Osteoglossomorpha: Mormyridae) of Odzala National Park, Republic of the Congo (Lékoli River, Congo River basin) with description of five new species
FIGURE 13. Petrocephalus mbossou n. sp. of the Lékoli River system of Odzala National Park, Republic of the Congo. A. Live photograph of the holotype (CU 92389; no scale). B. Photograph of the preserved holotype (scale bar = 1.0 cm). C. EOD waveform of the holotype. One EOD was arbitrarily selected from all recordings made of this individual. The selected EOD is shown here head-positive up (scale bar = 0.2 msec).
FIGURE 7 in African weakly electric fishes of the genus Petrocephalus (Osteoglossomorpha: Mormyridae) of Odzala National Park, Republic of the Congo (Lékoli River, Congo River basin) with description of five new species
FIGURE 7. Petrocephalus microphthalmus of the Lékoli River system of Odzala National Park, Republic of the Congo. A. Photograph of a live specimen (no scale). B. Photograph of a preserved specimen (scale bar = 1.0 cm). C. EOD waveforms. One EOD was arbitrarily selected from each recorded individual and superimposed with the other recordings (N = number of individuals). All EODs are scaled to the same peak-to-peak voltage, and they are plotted (head-positive up) on the same time scale as overlays centered on the largest positive peak of each waveform (scale bar = 0.2 msec).
FIGURE 1 in African weakly electric fishes of the genus Petrocephalus (Osteoglossomorpha: Mormyridae) of Odzala National Park, Republic of the Congo (Lékoli River, Congo River basin) with description of five new species
FIGURE 1. Map of Africa (right) showing the entire Congo River and its main tributaries together with the neighboring Lower Guinea province (first inset at center). The boundary between the Congo and Lower Guinea provinces is shown by a dashed line. Filled black circles indicate type localities for all Petrocephalus species that were described from either province and were considered valid just prior to the present study. Exact type localities are unknown for P. b a l a y i and P. sauvagii. Based on our understanding of the chronology of Central African exploration at the time of the descriptions, we estimate these type localities to be the following: the vicinity of Pool Malebo on the Lower Congo River near the modern cities of Brazzaville and Kinshasa [4.25° S, 15.29° E] for P. sauvagii; and the vicinity of the present-day city Lambaréné on the Lower Ogooué River [0.7° S, 10.22° E] for P. b a l a y i. Second inset at the far left: detailed map of Odzala National Park, located in the Congo River basin. Within the boundaries of the park, forest is shown in green and savannah in yellow. The red oval indicates our collection area (a segment of the Lékoli drainage system, including the lower parts of two of its tributaries, the Pandaka and Lékénie Rivers).
FIGURE 4. Petrocephalus zakoni n in African weakly electric fishes of the genus Petrocephalus (Osteoglossomorpha: Mormyridae) of Odzala National Park, Republic of the Congo (Lékoli River, Congo River basin) with description of five new species
FIGURE 4. Petrocephalus zakoni n. sp. of the Lékoli River system of Odzala National Park, Republic of the Congo. A. Photograph of a live specimen (no scale). B. Photograph of the preserved holotype (CU 88101; scale bar = 1.0 cm). C. EOD waveforms. One EOD was arbitrarily selected from each recorded individual and superimposed with the other recordings (N = number of individuals). All EODs are scaled to the same peak-to-peak voltage, and they are plotted (head-positive up) on the same time scale as overlays centered on the largest positive peak of each waveform (scale bar = 0.2 msec).
FIGURE 5. Petrocephalus valentini n in African weakly electric fishes of the genus Petrocephalus (Osteoglossomorpha: Mormyridae) of Odzala National Park, Republic of the Congo (Lékoli River, Congo River basin) with description of five new species
FIGURE 5. Petrocephalus valentini n. sp. of the Lékoli River system of Odzala National Park, Republic of the Congo. A. Photograph of a live specimen (no scale). B. Photograph of the preserved holotype (CU 88117; scale bar = 1.0 cm). C. EOD waveforms. One EOD was arbitrarily selected from each recorded individual and superimposed with the other recordings (N = number of individuals). All EODs are scaled to the same peak-to-peak voltage, and they are plotted (head-positive up) on the same time scale as overlays centered on the largest positive peak of each waveform (scale bar = 0.2 msec).
FIGURE 12 in African weakly electric fishes of the genus Petrocephalus (Osteoglossomorpha: Mormyridae) of Odzala National Park, Republic of the Congo (Lékoli River, Congo River basin) with description of five new species
FIGURE 12. Petrocephalus grandoculis of the Lékoli River system of Odzala National Park, Republic of the Congo. A. Photograph of a live specimen (no scale). B. Photograph of a preserved specimen (scale bar = 1.0 cm). C. EOD waveform. One EOD was arbitrarily selected from the only individual of this species recorded in Odzala, an obvious male. The EOD is shown here head-positive up (scale bar = 0.2 msec).
FIGURE 14 in African weakly electric fishes of the genus Petrocephalus (Osteoglossomorpha: Mormyridae) of Odzala National Park, Republic of the Congo (Lékoli River, Congo River basin) with description of five new species
FIGURE 14. Historical illustrations of Petrocephalus species described from Congo or Lower Guinea that occur in Odzala. The drawings were reproduced from the following sources: Petrocephalus binotatus from Pellegrin (1928); Petrocephalus balayi from Boulenger (1909–1916); Petrocephalus microphthalmus from Poll (1967); Petrocephalus christyi from Boulenger (1920); Petrocephalus sauvagii from Boulenger (1909–1916); and Petrocephalus grandoculis from Boulenger (1920).
FIGURE 10 in African weakly electric fishes of the genus Petrocephalus (Osteoglossomorpha: Mormyridae) of Odzala National Park, Republic of the Congo (Lékoli River, Congo River basin) with description of five new species
FIGURE 10. Petrocephalus sauvagii of the Lékoli River system of Odzala National Park, Republic of the Congo. A. Photograph of a live specimen (no scale). B. Photograph of a preserved specimen (scale bar = 1.0 cm). C. EOD waveforms. One EOD was arbitrarily selected from each recorded individual and superimposed with the other recordings (N = number of individuals). All EODs are scaled to the same peak-to-peak voltage, and they are plotted (head-positive up) on the same time scale as overlays centered on the largest positive peak of each waveform (scale bar = 0.2 msec).
FIGURE 6 in African weakly electric fishes of the genus Petrocephalus (Osteoglossomorpha: Mormyridae) of Odzala National Park, Republic of the Congo (Lékoli River, Congo River basin) with description of five new species
FIGURE 6. Petrocephalus balayi of the Lékoli River system of Odzala National Park, Republic of the Congo. A. Photograph of a live specimen (no scale). B. Photograph of a preserved specimen (scale bar = 1.0 cm). C. EOD waveforms. One EOD was arbitrarily selected from each of two recorded individuals, and they were superimposed together. Both EODs are scaled to the same peak-to-peak voltage, and they are plotted (head-positive up) on the same time scale as an overlay centered on the largest positive peak (scale bar = 0.2 msec).
FIGURE 3 in African weakly electric fishes of the genus Petrocephalus (Osteoglossomorpha: Mormyridae) of Odzala National Park, Republic of the Congo (Lékoli River, Congo River basin) with description of five new species
FIGURE 3. Petrocephalus binotatus of the Lékoli River system of Odzala National Park, Republic of the Congo. A. Photograph of a live specimen (no scale: the photo has been maximally enlarged to better illustrate details of body shape, melanin patterning, etc.). B. Photograph of a preserved specimen (scale bar = 1.0 cm). C. EOD waveforms displayed separately for obvious males and other individuals (see text). One EOD was arbitrarily selected from each recorded individual and superimposed with the other recordings (N = number of individuals, given separately for obvious males and all other individuals). All EODs are scaled to the same peak-to-peak voltage, and they are plotted (head-positive up) on the same time scale as overlays centered on the largest positive peak of each waveform (scale bar = 0.2 msec).
FIGURE 8. Petrocephalus odzalaensis n in African weakly electric fishes of the genus Petrocephalus (Osteoglossomorpha: Mormyridae) of Odzala National Park, Republic of the Congo (Lékoli River, Congo River basin) with description of five new species
FIGURE 8. Petrocephalus odzalaensis n. sp. of the Lékoli River system of Odzala National Park, Republic of the Congo. A. Photograph of a live specimen (no scale). B. Photograph of the preserved holotype (CU 88048; scale bar = 1.0 cm). C. EOD waveforms. One EOD was arbitrarily selected from each recorded individual and superimposed with the other recordings (N = number of individuals). All EODs are scaled to the same peak-to-peak voltage, and they are plotted (head-positive up) on the same time scale as overlays centered on the largest positive peak of each waveform (scale bar = 0.2 msec).
FIGURE 2 in African weakly electric fishes of the genus Petrocephalus (Osteoglossomorpha: Mormyridae) of Odzala National Park, Republic of the Congo (Lékoli River, Congo River basin) with description of five new species
FIGURE 2. Knollenorgan rosettes depicted on a schematic drawing of the head of a specimen of Petrocephalus pulsivertens n. sp. Dense clusters of Knollenorgan electroreceptors on the heads of this and several other Petrocephalus species were described by Harder (1968) as the "Augenrosette," "Nackenrosette" and "Kehlrosette," depending on their position on the head. Each black point represents a single Knollenorgan electroreceptor. Several isolated Knollenorgans occur outside these three rosettes (in this individual of P. pulsivertens), but they are not indicated in the drawing for clarity.
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
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.