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1,017 results for “freshwater fish”
Adaptation to herbivory and detritivory drives the convergent evolution of large abdominal cavities in a diverse freshwater fish radiation (Otophysi: Characiformes)
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Data from: Coping with the cold: energy storage strategies for surviving winter in freshwater fish
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A fossil-calibrated time-tree of all Australian freshwater fishes
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Multi-species models reveal that eDNA metabarcoding is more sensitive than backpack electrofishing for conducting fish surveys in freshwater streams
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Optimising environmental DNA biomonitoring for Kakadu National Park's freshwater fish communities
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Transcriptome profile analyses of head kidney in roach (Rutilus rutilus), common bream (Abramis brama) and their hybrids: does infection by monogenean parasites in freshwater fish reveal differences i
GEO Series GSE240906. Rutilus rutilus x Abramis brama; Rutilus rutilus; Abramis brama. 90 samples. Type: Expression profiling by high throughput sequencing.
Unraveling the molecular mechanisms of fish physiological response to freshwater salinization: A comparative multi-tissue transcriptomic study in a river polluted by potash mining
GEO Series GSE271215. Phoxinus septimaniae. 18 samples. Type: Expression profiling by high throughput sequencing.
Figure 2 from: Bogutskaya NG, Diripasko OA, Zupančič P, Jelić D, Naseka A (2019) Phenotypic diversity in an endangered freshwater fish Squalius microlepis (Actinopterygii, Leuciscidae). ZooKeys 897: 115-147. https://doi.org/10.3897/zookeys.897.38768
Figure 2 Squalius tenellus, NMW 16001, lectotype, 122.1 mm SL, 'Livno'.
Data from: Differential sensitivity to in vitro inhibition of cytochrome P450 aromatase (CYP19) activity among 18 freshwater fishes
There is significant concern regarding potential impairment of fish reproduction associated with endocrine disrupting chemicals. Aromatase (CYP19) is a steroidogenic enzyme involved in the conversion of androgens to estrogens. Inhibition of aromatase by chemicals can result in reduced concentrations of estrogens leading to adverse reproductive effects. These effects have been extensively investigated in a small number of laboratory model fishes, such as fathead minnow (Pimephales promelas), Japanese medaka (Oryzias latipes), and zebrafish (Danio rerio). But, differences in sensitivity among species is largely unknown. Therefore, this study took a first step towards understanding potential differences in sensitivity to aromatase inhibitors among fishes. Specifically, a standard in vitro aromatase inhibition assay using subcellular fractions of whole tissue homogenates was used to evaluate the potential sensitivity of eighteen phylogenetically diverse species of freshwater fish to the nonsteroidal aromatase inhibitor fadrozole. Sensitivity to fadrozole ranged by more than 52-fold among these species. Five species were further investigated for sensitivity to up to four additional nonsteroidal aromatase inhibitors, letrozole, imazalil, prochloraz, and propiconazole. Potencies of each of these chemicals relative to fadrozole ranged by up to two orders of magnitude among the five species. Fathead minnow, Japanese medaka, and zebrafish were among the least sensitive to all the investigated chemicals; therefore, ecological risks of aromatase inhibitors derived from these species might not be adequately protective of more sensitive native fishes. This information could guide more objective ecological risk assessments of native fishes to chemicals that inhibit aromatase.
Data from: Artificial barriers prevent genetic recovery of small isolated populations of a low-mobility freshwater fish
Habitat loss and fragmentation often result in small, isolated populations vulnerable to environmental disturbance and loss of genetic diversity. Low genetic diversity can increase extinction risk of small populations by elevating inbreeding and inbreeding depression, and reducing adaptive potential. Due to their linear nature and extensive use by humans, freshwater ecosystems are especially vulnerable to habitat loss and fragmentation. Although the effects of fragmentation on genetic structure have been extensively studied in migratory fish, they are less understood in low-mobility species. We estimated impacts of instream barriers on genetic structure and diversity of the low-mobility river blackfish (Gadopsis marmoratus) within five streams separated by weirs or dams constructed 45–120 years ago. We found evidence of small-scale (<13 km) genetic structure within reaches unimpeded by barriers, as expected for a fish with low mobility. Genetic diversity was lower above barriers in small streams only, regardless of barrier age. In particular, one isolated population showed evidence of a recent bottleneck and inbreeding. Differentiation above and below the barrier was greatest (FST =0.13) in this stream, but in other streams did not differ from background levels. Spatially explicit simulations suggest that short-term barrier effects would not be detected with our dataset unless effective population sizes were very small (<100). Our study highlights that, in structured populations, the ability to detect short-term genetic effects from barriers is reduced and requires more genetic markers compared to panmictic populations. We also demonstrate the importance of accounting for natural population genetic structure in fragmentation studies.
Data from: Sex ratio variation shapes the ecological effects of a globally introduced freshwater fish
Sex ratio and sexual dimorphism have long been of interest in population and evolutionary ecology, but consequences for communities and ecosystems remain untested. Sex ratio could influence ecological conditions whenever sexual dimorphism is associated with ecological dimorphism in species with strong ecological interactions. We tested for ecological implications of sex ratio variation in the sexually dimorphic western mosquitofish, Gambusia affinis. This species causes strong pelagic trophic cascades and exhibits substantial variation in adult sex ratios. We found that female-biased populations induced stronger pelagic trophic cascades compared with male-biased populations, causing larger changes to key community and ecosystem responses, including zooplankton abundance, phytoplankton abundance, productivity, pH and temperature. The magnitude of such effects indicates that sex ratio is important for mediating the ecological role of mosquitofish. Because both sex ratio variation and sexual dimorphism are common features of natural populations, our findings should encourage broader consideration of the ecological significance of sex ratio variation in nature, including the relative contributions of various sexually dimorphic traits to these effects.
Data from: A key metabolic gene for recurrent freshwater colonization and radiation in fishes
Colonization of new ecological niches has triggered large adaptive radiations. Although some lineages have made use of such opportunities, not all do so. The factors causing this variation among lineages are largely unknown. Here, we show that deficiency in docosahexaenoic acid (DHA), an essential ω-3 fatty acid, can constrain freshwater colonization by marine fishes. Our genomic analyses revealed multiple independent duplications of the fatty acid desaturase gene Fads2 in stickleback lineages that subsequently colonized and radiated in freshwater habitats, but not in close relatives that failed to colonize. Transgenic manipulation of Fads2 in marine stickleback increased their ability to synthesize DHA and survive on DHA-deficient diets. Multiple freshwater ray-finned fishes also show a convergent increase in Fads2 copies, indicating its key role in freshwater colonization.
Data from: Do the historical biogeography and evolutionary history of the digenean Margotrema spp. across central Mexico mirror those of their freshwater fish hosts (Goodeinae)?
Host-parasite systems provide an ideal platform to study evolution at different levels, including codivergence in a historical biogeography context. In this study we aim to describe biogeographic and codivergent patterns and associated processes of the Goodeinae freshwater fish and their digenean parasite (Margotrema spp.) over the last 6.5 Ma (million years), identifying the main factors (host and/or hydrogeomorphology) that influenced the evolution of Margotrema. We obtained a species tree for Margotrema spp. using DNA sequence data from mitochondrial and nuclear molecular markers (COI and ITS1, respectively) and performed molecular dating to discern divergence events within the genus. The dispersal-extinction-cladogenesis (DEC) model was used to describe the historical biogeography of digeneans and applied to cophylogenetic analyses of Margotrema and their goodeine hosts. Our results showed that the evolutionary history of Margotrema has been shaped in close association with its geographic context, especially with the geological history of central Mexico during the Pleistocene. Host-specificity has been established at three levels of historical association: a) Species-Species, represented by Xenotaenia resolanae-M. resolanae exclusively found in the Cuzalapa River Basin; b) Species-Lineage, represented by Characodon audax-M. bravoae Lineage II, exclusive to the Upper and Middle Mezquital River Basin, and c) Tribe-Lineage, including two instances of historical associations among parasites and hosts at the taxonomical level of tribe, one represented by Ilyodontini-M. bravoae Lineage I (distributed across the Ayuquila and Balsas River Basins), and another comprised of Girardinichthyini/Chapalichthyini-M. bravoae Lineage III, found only in the Lerma River Basin. We show that the evolutionary history of the parasites is, on several occasions, in agreement with the phylogenetic and biogeographic history of their hosts. A series of biogeographic and host-parasite events explain the codivergence patterns observed, in which cospeciation and colonisation via host-switching and vicariant plus dispersal events are appreciated, at different times during the diversification history of both associates, particularly during the Pleistocene.
Holistic multi-method survey to enhance Madagascar's freshwater fish conservation
<p>Freshwater ecosystems are crucial for global biodiversity, supporting plant and animal species and providing essential resources. However, these ecosystems, particularly in island environments such as Madagascar, are under significant threat. Our study focuses on the Amboaboa River basin, home to the rare and endemic fish species <i>Rheocles derhami</i>, last recorded in 2013. To assess the status of this and other threatened fish species including <i>Ptychochromis insolitus</i> and <i>Paretroplus gymnopreopercularis</i>, and to understand freshwater fish population dynamics in this biodiversity hotspot, we conducted a comprehensive survey using both environmental DNA (eDNA) and traditional fishing methods. Our findings reveal updated records of <i>Rheocles derhami</i> and an expanded species list within these freshwater environments. We also explore the implications of combining these two monitoring approaches and investigate the trade-offs associated with multi-primer assessments in eDNA analysis, focusing on three different primers targeting the 12S mitochondrial gene: MiFish, Tele02, and Riaz. Additionally, we provide 12S reference barcodes for 10 species across 9 genera of fishes from the region to increase the coverage of the public reference databases. Overall, our study enlightens the current state of freshwater biodiversity in Amboaboa River basin and underscores the value of employing multiple methods for effective conservation strategies.</p>
Figure A1 in A student-based expansion of the strategies of reproduction in fish (STOREFISH) database to 288 North American freshwater and anadromous species for 14 egg and larval traits
Figure A1. – Box-plots for the first four survey questions (Q1-Q4). See Table A1 for explanations.
Fig. 115. Trichogaster lalius, 43.1 in The non-native freshwater fishes of Singapore: an annotated compilation
Fig. 115. Trichogaster lalius, 43.1 mm SL male, trade material.
Fig. 72. Xiphophorus variatus, 28.3 in The non-native freshwater fishes of Singapore: an annotated compilation
Fig. 72. Xiphophorus variatus, 28.3 mm SL, Bukit Brown (note deformed dorsal fin).
Fig. 89. Geophagus altifrons, 145.6 in The non-native freshwater fishes of Singapore: an annotated compilation
Fig. 89. Geophagus altifrons, 145.6 mm SL, Bedok Reservoir.
Fig. 55 in The non-native freshwater fishes of Singapore: an annotated compilation
Fig. 55. Mystus wolffii, ca. 200 mm SL, Upper Seletar Reservoir.
Fig. 45. Toxabramis houdemeri, 75.7 in The non-native freshwater fishes of Singapore: an annotated compilation
Fig. 45. Toxabramis houdemeri, 75.7 mm SL, Yishun Pond.
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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.