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1,017 results for “freshwater fish”
FIGURES 1–11 in Bothriocephalidean tapeworms (Cestoda) of freshwater fish in Africa, including erection of Kirstenella n. gen. and description of Tetracampos martinae n. sp.
FIGURES 1–11. Scanning electron micrographs of the scoleces and the body surface. 1, 2, 4, Bothriocephalus acheilognathi Yamaguti, 1934 ex Labeobarbus nedgia from Ethiopia (MHNG 55310). 1, 2, Scolex, dorsoventral and sublateral views. 4, Surface of apical region of scolex. 3, 6, 9, Ichthybothrium ichthybori Khalil, 1971 ex Ichthyborus besse from Sudan (IPCAS C- 455). 3, Scolex, dorsoventral view. 6, Surface of apical region of scolex. 9, Detail of operculum of egg. 5, 7, 8, 10, 11, Kirstenella gordoni (Woodland, 1937) ex Heterobranchus bidorsalis from Kenya (IPCAS C-609). 5, Surface of apical region of scolex. 7, Scolex, dorsoventral view. 8, Scolex, apical view. 10, Mature segment, ventral view. 11, Detail of operculum of egg.
FIGURES 12–14. Line drawings. 12 in Bothriocephalidean tapeworms (Cestoda) of freshwater fish in Africa, including erection of Kirstenella n. gen. and description of Tetracampos martinae n. sp.
FIGURES 12–14. Line drawings. 12, Detail of genital complex of gravid segment, dorsal view, eggs not illustrated, type specimen of Bothriocephalus kivuensis Baer & Fain, 1958 (= B. acheilognathi Yamaguti, 1934) ex Barbus altianalis from Democratic Republic of the Congo (MHNG 40332). 13, 14, Ichthybothrium ichthybori Khalil, 1971 ex Ichthyborus besse from the Sudan (IPCAS C-455). 13, Complete worm with single genital complex per segment. 14, Mature segment with double genital complexes.
FIGURES 10–13 in Two new species of Phyllodistomum Braun, 1899 (Digenea: Gorgoderidae), from freshwater fishes (Cyprinodontiformes: Goodeidae: Goodeinae) in central Mexico: An integrative taxonomy approach using morphology, ultrastructure and molecular phylogenetics
FIGURES 10–13. Scanning electron microscopy of a specimen of Phyllodistomum wallacei n. sp. 10. Adult, ventral view, with scattered dome-like papillae on hind- and forebody. 11. Oral sucker, showing 7 pairs of papillae. 12. Ventral sucker, showing 3 pairs of papillae. 13. Dome-like papillae with small projections.
FIGURE 14 in Two new species of Phyllodistomum Braun, 1899 (Digenea: Gorgoderidae), from freshwater fishes (Cyprinodontiformes: Goodeidae: Goodeinae) in central Mexico: An integrative taxonomy approach using morphology, ultrastructure and molecular phylogenetics
FIGURE 14. Coalescent-based phylogenetic tree obtained from the species tree analysis of the combined data set (COI+28S). The scale bar represents the number of nucleotide substitutions per site. Filled circles above/below branches represent Bayesian posterior probability ≥ 0.95. GenBank accession numbers of the new species are given in the taxonomic remarks section.
FIGURES 6–9 in Two new species of Phyllodistomum Braun, 1899 (Digenea: Gorgoderidae), from freshwater fishes (Cyprinodontiformes: Goodeidae: Goodeinae) in central Mexico: An integrative taxonomy approach using morphology, ultrastructure and molecular phylogenetics
FIGURES 6–9. Scanning electron microscopy of a specimen of Phyllodistomum cribbi n. sp. 6. Adult, ventral view. 7. Oral sucker, showing 4 pairs of papillae. 8. Ventral sucker, showing 3 pairs of papillae. 9. Ventral surface of hindbody exhibiting papillae on the tegument.
FIGURES 2–5 in Two new species of Phyllodistomum Braun, 1899 (Digenea: Gorgoderidae), from freshwater fishes (Cyprinodontiformes: Goodeidae: Goodeinae) in central Mexico: An integrative taxonomy approach using morphology, ultrastructure and molecular phylogenetics
FIGURES 2–5. Line drawings of the holotype of P. cribbi n. sp. and P. wallacei n. sp., and detail of the male reproductive system of both species 2. Phyllodistomum cribbi n. sp. from Zoogoneticus quitzeoensis, ventral view. 3. Detail of the cirrus sac of P. cribbi n. sp. 4. Phyllodistomum wallacei n. sp. from Ilyodon furcidens, ventral view. 5. Detail of the cirrus sac of P. wallacei n. sp. Symbols: os = oral sucker, gp = genital pore, c = cecum, vs = ventral sucker, vg = vitelline gland, o = ovary, t = testis, e = eggs.
FIGURE 1. Hydrological systems and collection sites for Phyllodistomum cribbi n in Two new species of Phyllodistomum Braun, 1899 (Digenea: Gorgoderidae), from freshwater fishes (Cyprinodontiformes: Goodeidae: Goodeinae) in central Mexico: An integrative taxonomy approach using morphology, ultrastructure and molecular phylogenetics
FIGURE 1. Hydrological systems and collection sites for Phyllodistomum cribbi n. sp. (square) and P. wallacei n. sp. (circles) in central Mexico. Full green circles and square correspond to localities where specimens were collected for molecular phylogenetic analyses; full grey circle and square indicate specimens identified either as Dendrorchis sp. or Phyllodistomum sp. from previous studies. These records were not included in the phylogenetic analyses in this study.
Phenotypic stability in scalar calcium of freshwater fish across a wide range of aqueous calcium availability in nature
<div> <p>Spatial environmental gradients can promote adaptive differences among conspecific populations as a result of local adaptation or phenotypic plasticity. Such divergence can be opposed by various constraints, including gene flow, limited genetic variation, temporal fluctuations, or developmental constraints. We focus on the constraint that can be imposed when some populations are found in locations characterized by low levels of an essential nutrient. We use scales of wild fish to investigate phenotypic effects of spatial variation in a potentially limiting nutrient – calcium. If scale calcium (we use "scalar" calcium for consistency with the physiology literature) simply reflects environmental calcium availability, we expect higher levels of scalar calcium in fish from calcium-rich water, compared to fish from calcium-poor water. To consider this "passive response" scenario, we analysed scalar calcium concentrations from three native fish species (<em>Lepomis gibbosus</em>, <em>Percina caprodes</em>, and <em>Perca flavescens</em>) collected at multiple sites across a dissolved calcium gradient in the Upper St. Lawrence River. Contradicting the "passive response" scenario, we did not detect strong or consistent relationships between scalar calcium and water calcium. Instead, for a given proportional increase in water calcium across the wide environmental gradient, the corresponding proportional change in scalar calcium was much smaller. We thus favor the alternative "active homeostasis" scenario, wherein fish from calcium-poor water are better able to uptake, mobilize, and deposit calcium than are fish from calcium-rich water. We further highlight the importance of studying functional traits, such as scales, in their natural setting as opposed to only laboratory studies.</p> </div>
Supplementary material 1 from: Kaviarasu M, Ramli FF, Mohd Ilham Norhakim L, Othman N, Mahyuddin NAA, Haris H, Sariyati NH, Najmuddin MF, Aman S, Zaharin SF, Abdul-Latiff MAB (2022) First insight into freshwater fish assemblages in the western part of the Endau-Rompin landscape, Malaysia. Nature Conservation 50: 265-281. https://doi.org/10.3897/natureconservation.50.86090
Eleven environmental variables measured in each substation of rivers Juaseh, Segamat, and Labis of ERL.
FIGURE 3 in Monogenea on exotic Indian freshwater fish. 5. First report of pathogenic Gussevia asota (Platyhelminths) from Oscar Astronotus ocellatus (Agassiz 1831) (Perciformes: Cichlidae)
FIGURE 3. Phylogenetic tree inferred from ML method based on partial 28S rDNA gene sequences of Gussevia asota Kritsky et al., 1989. Numbers preceding the taxa are GenBank accession numbers for their 28s rRNA gene sequences. Bootstrap values (1000 replicates) are shown above nodes. Quadriacanthus bagrae and Thaparocleidus siluri were used as the outgroups. The taxon denoted by a black dot corresponds to the sequence generated in this study.
FIGURE 1 in Monogenea on exotic Indian freshwater fish. 5. First report of pathogenic Gussevia asota (Platyhelminths) from Oscar Astronotus ocellatus (Agassiz 1831) (Perciformes: Cichlidae)
FIGURE 1. Line drawings of sclerotised parts of Gussevia asota Kritsky et al., 1989 from Astronauts ocellatus (Agassiz 1831). A. Dorsal anchor. B. Ventral anchor. C. Hook pair 5. D. Hook pairs 1–4, 6, 7. E. Dorsal bar. F. Ventral bar. G. Vagina. H and I. Male copulatory organ (different configurations) with a prostatic reservoir and a seminal vesicle. Scale bar = 30 μm.
FIGURE 2 in Monogenea on exotic Indian freshwater fish. 5. First report of pathogenic Gussevia asota (Platyhelminths) from Oscar Astronotus ocellatus (Agassiz 1831) (Perciformes: Cichlidae)
FIGURE 2. Phase contrast, DIC, and light microscopy images of sclerotised parts of Gussevia asota Kritsky et al., 1989 from Astronotus ocellatus (Agassiz 1831). A. Haptoral anchor/bar complex and hooks. B. Male copulatory organ. C and D. Vagina. E. Hook pairs 1–4, 6, 7. F. Haptoral lobes. Scale bar: A, B, C, D, F=20 μm; E=10 μm.
Prediction of current and future suitable habitats for three invasive freshwater fish species (Lepomis gibbosus, Perccottus glenii and Pseudorasbora parva) in Europe
<p><span>Climate change can have a significant impact on the earth's ecosystems. Invasive species will respond to climate change, and their responses will have ecological and economic implications. Habitat suitability models (HSMs) are one of the most important tools currently available to assess the potential impacts of climate change on species. Projections of models of suitable conditions for species, built using Maxent based on the occurrence throughout the range (native and invasive), on the current climate of Europe and on the forecast climate data for the 2050s and 2070s under the SSP2 and SSP5 scenarios are present here.</span></p>
FIGURE 3 in Freshwater fishes of the Philippines: a provisional checklist
FIGURE 3. The IUCN Red List status of freshwater fishes (all species and endemics) of the Philippines. (EX) Extinct, (CR) Critically Endangered, (EN) Endangered, (VU) Vulnerable, (NT) Near Threatened, (LC) Least Concern, (DD) Data Deficient and (NE) Not Evaluated.
FIGURE 2 in Freshwater fishes of the Philippines: a provisional checklist
FIGURE 2. Distribution of freshwater fish species on the different islands in the Philippines. Island Groups: (L) Luzon, (mo) Mindoro, (P) Palawan, (V) Visayas and (M) Mindanao.
Unlocking the genomes of formalin-fixed freshwater fish specimens: An assessment of factors influencing DNA extraction quantity and quality
<p>DNA quality and quantity metrics (Microsoft Excel worksheet with 3 sheets, one per species).</p> <p>We compared two protocols developed to extract DNA from formalin-fixed tissues using specimens of three freshwater fishes: Southern Brook Lamprey <em>Ichthyomyzon gagei</em>, Slimy Sculpin <em>Cottus cognatus</em>, and Brown Trout <em>Salmo trutta</em>. Extractions were attempted using hot alkali digestion with and without buffer wash pretreatments to compare the DNA concentration, purity, and fragment length of DNA recovered between extraction protocols, tissue types (muscle and caudal fin tissue for Brown Trout and Slimy Sculpin), and preservation periods (5 or 7 years for Southern Brook Lamprey).</p> <p>Four metrics were collected: DNA quantity (measured using Qubit 3.0 instrument with dsDNA high sensitivity kit); DNA purity measured by A260/A280 ratio (measured using NanoDrop 2000 spectrophotometer); DNA purity measured by A260/A230 ratio (measured using NanoDrop 2000 spectrophotometer); and percent fragments >= 300 base pairs (measured using ImageJ). For spectrophotometric absorbance ratios, an A260/A280 ratio of 1.8 and an A260/ A230 ratio of 2.0 were considered to represent “pure” DNA (i.e., free of contaminants). For analyses of DNA purity, deviations from 1.8 for the A260/A280 ratio and from 2.0 for the A260/A230 ratio were used as the response variables, such that larger deviation values corresponded to less-pure DNA.</p> <p>Please see attached README.md file for additional information.</p>
FIGURE 4 in Marine and freshwater fishes of Alabama: a revised checklist and discussion of taxonomic issues
FIGURE 4. Summary of state status (A), habitat classifications (B), and collection localities by habitat classification (C) of marine and freshwater fishes of Alabama in the present checklist. Non-duplicate collection localities for species that were classified as primarily freshwater ('F' designations), primarily marine ('M' designations), and freshwater and marine ('F, M' designations) in habit are summarized in a Venn diagram in panel C, where the total number in each area sums to the total number of unique collection localities in our final dataset (n = 10,325). Abbreviations: Exstate, extirpated from the state; F, freshwater; I, introduced species; M, marine; N, native; N/A, not applicable (no state status because species does not occur within state borders); Reint, reintroduced in state.
Data from: Do freshwater ecoregions and continental shelf width predict patterns of historical gene flow in the freshwater fish Poecilia butleri?
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Data: Diversity-production relationships of fish communities in freshwater stream ecosystems
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Data from: Climate and local abundance in freshwater fishes
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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.