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68 results for “endangered fish”
US Fish and Wildlife Service Endangered Species Listings
<p>United States Fish and Wildlife Service (USFWS). As the principal federal partner responsible for administering the Endangered Species Act (ESA), we take the lead in recovering and conserving our nation__s imperiled species by fostering partnerships, employing scientific excellence, and developing a workforce of conservation leaders. As we work in partnership with others, our two major goals are to: Protect endangered and threatened species, and then pursue their recovery; and Conserve candidate species and species-at-risk so that listing under the ESA is not necessary. https://www.fws.gov/endangered/species/</p>
Fig. 2 in Ecology of Mylesinus paucisquamatus Jégu & Santos, 1988, an endangered fish species from the rio Tocantins basin
Fig. 2. Number of individuals of Mylesinus paucisquamatus
Genetic erosion in an endangered desert fish during a multi-decadal megadrought despite long-term supportive breeding
<p>Human water use combined with a recent megadrought have reduced river and stream flow through the Southwestern United States and led to periodic drying of formerly perennial river segments. Reductions in snowmelt runoff and increased extent of drying collectively threaten short-lived, obligate aquatic species, including the endangered Rio Grande Silvery Minnow. This species experiences 'boom-and-bust' population dynamics where large fluctuations in abundance are expected to lower estimates of effective population size and erode genetic diversity over time. Rates of diversity loss are also affected by additions of hatchery-origin fish used to supplement the wild population. We leveraged demographic and genetic data from wild and hatchery individuals to understand the relationship of genetic diversity and effective population size to abundance over the last two decades. Genetic diversity was low during the early 2000s, but diversity and demographic metrics stabilized after the hatchery program was initiated and environmental conditions improved. Yet, from 2017 onward, allelic diversity declined (Cohen's <em>d</em>=1.34) and remains low despite hatchery stocking and brief wild population recovery. Across the time series, single-sample estimates of effective population size (N<sub>eD</sub>) were positively associated (<em>r</em>=0.53) with wild/total abundance, but as the proportion of hatchery-origin spawners increased, N<sub>eD</sub> was reduced (N<sub>eD</sub> <em>r</em>= -0.55). Megadrought limits wild spawner abundance and precludes refreshment of hatchery brood stocks with wild fish, hence we predict an increasingly hatchery-dominated population, and accelerated loss of genetic diversity despite supplementation. We recommend an adaptive and accelerated management plan that integrates river flow management and hatchery operations to slow the pace of genetic diversity loss exacerbated by megadrought.</p>
Genomic and phenotypic divergence informs translocation strategies for an endangered freshwater fish
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Genetic erosion in an endangered desert fish during a multi-decadal megadrought despite long-term supportive breeding
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Ignorance is not bliss: Evolutionary naïveté in an endangered desert fish and implications for conservation
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Data from: "De novo assembled transcriptome of organs involved in reproduction in an endangered endemic Iberian cyprinid fish (Squalius pyrenaicus)" in Genomic Resources Notes Accepted 1 June 2015 to 31 July 2015
Sex determination systems are diverse, especially among fish, and include genetic and/or environmental components. Unexpectedly for such a basic aspect of development, sex determination systems change rapidly during evolution and gonadal fate is not ultimate, being actively maintained lifelong. Here, sequences of expressed genes involved in maintenance of gonad identity and reproduction processes were obtained through transcriptome assembly of the brain-gonadal axis tissues of a freshwater fish inhabiting highly variable environments, the gonochoristic Iberian fish Squalius pyrenaicus. Through Illumina total RNA-sequencing, male and female transcriptomes of brain and gonad tissues were assembled with Trans-ABySS software and merged to produce a more comprehensive S. pyrenaicus transcriptome. Coding sequences (CDS) predicted by TransDecoder were annotated using blastx. By means of read mapping against the reference transcriptome and CDS datasets, using Bowtie2, the accuracy of read mapping was assessed. This first endemic Iberian cyprinid transcriptome of organs involved in reproduction processes may serve as a valuable genomic resource for studying sexual mechanisms and other aspects of evolution, such as speciation and responses to environmental changes, and may be a useful tool for conservation studies since S. pyrenaicus is an endangered species.
Data from: Local forage fish abundance influences foraging effort and offspring condition in an Endangered marine predator
1. Understanding the functional relationship between marine predators and their prey is vital to inform ecosystem-based management. However, collecting concurrent data on predator behaviour and their prey at relevant scales is challenging. Moreover, opportunities to study these relationships in the absence of industrial fishing are extremely rare. 2. We took advantage of an experimental fisheries closure to study how local prey abundance influences foraging success and chick condition of Endangered African penguins Spheniscus demersus in the Benguela Ecosystem. 3. We tracked 75 chick-provisioning penguins with GPS-time-depth devices, measured body condition of 569 chicks, quantified the diet of 83 breeding penguins and conducted 12 forage fish hydro-acoustic surveys within a 20 km radius of Robben Island, South Africa, over three years (2011–2013). Commercial fishing for the penguins' main prey, sardine Sardinops sagax and anchovy Engraulis encrasicolus, was prohibited within this 20 km radius during the study period. 4. Local forage fish abundance explained 60% of the variation in time spent diving for 14 penguins at sea within 2 days of a hydro-acoustic survey. Penguin foraging effort (time spent diving, number of wiggles per trip, number of foraging dives and the maximum distance travelled) increased and offspring body condition decreased as forage fish abundance declined. In addition, quantile regression revealed that variation in foraging effort increased as prey abundance around the colony declined. 5. Policy implications. Our results demonstrate that local forage fish abundance influences seabird foraging and offspring fitness. They also highlight the potential for offspring condition and the mean-variance relationship in foraging behaviour to act as leading indicators of poor prey abundance. By rapidly indicating periods where forage resources are scarce, these metrics could help limit seabird-fisheries competition and aid the implementation of dynamic ocean management.
FIGURE 6 in Gymnotus refugio, a new and endangered species of electric fish of the Gymnotus pantherinus species-group from southern Brazil (Gymnotiformes: Gymnotidae)
FIGURE 6. Comparison between linear regressions of caudal filament length versus total length (TL) for Gymnotus pantherinus and G. refugio.
FIGURE 7 in Gymnotus refugio, a new and endangered species of electric fish of the Gymnotus pantherinus species-group from southern Brazil (Gymnotiformes: Gymnotidae)
FIGURE 7. Comparison between linear regressions of gape width versus head length (HL) for Gymnotus pantherinus and G. refugio.
FIGURE 5 in Gymnotus refugio, a new and endangered species of electric fish of the Gymnotus pantherinus species-group from southern Brazil (Gymnotiformes: Gymnotidae)
FIGURE 5. Syntype of Gymnotus pantherinus (NMW 76443, 246.45 mm TL) from the region of Santos, São Paulo State, Brazil.
FIGURE 4 in Gymnotus refugio, a new and endangered species of electric fish of the Gymnotus pantherinus species-group from southern Brazil (Gymnotiformes: Gymnotidae)
FIGURE 4. Typical habitat of Gymnotus refugio. Carmelitas creek covered by dense aquatic vegetation near its mouth in laguna dos Patos, Laranjal beach, Pelotas, Rio Grande do Sul State, Brazil.
FIGURE 2 in Gymnotus refugio, a new and endangered species of electric fish of the Gymnotus pantherinus species-group from southern Brazil (Gymnotiformes: Gymnotidae)
FIGURE 2. Color pattern variation in Gymnotus refugio, paratypes, UFRGS 16371 (above, 176.29 mm TL, below, 151.19 mm TL), Refúgio da Vida Silvestre Banhado dos Pachecos, Viamão, Rio Grande do Sul State, Brazil. Photos taken just after fixation in formalin.
FIGURE 1 in Gymnotus refugio, a new and endangered species of electric fish of the Gymnotus pantherinus species-group from southern Brazil (Gymnotiformes: Gymnotidae)
FIGURE 1. Gymnotus refugio, holotype (UFRGS 8752, 171.53 mm TL), laguna dos Patos drainage, Amaral Ferrador, Rio Grande do Sul State, Brazil.
FIGURE 3 in Gymnotus refugio, a new and endangered species of electric fish of the Gymnotus pantherinus species-group from southern Brazil (Gymnotiformes: Gymnotidae)
FIGURE 3. Distribution of Gymnotus refugio in southern Brazil. Circles represent paratype localities; empty circle represents the type locality.
FIG. 3 in Otolith Microstructure Analysis Elucidates Spawning and Early Life Histories of Federally Endangered Fishes in the San Juan River
FIG. 3. Razorback Sucker age as a function of length (SL). Colored dots indicate otolith ages, and black squares are predicted ages produced from the linear growth function.
FIG. 1. Colorado Pikeminnow and Razorback Sucker larvae for this study were selected from 2009 in Otolith Microstructure Analysis Elucidates Spawning and Early Life Histories of Federally Endangered Fishes in the San Juan River
FIG. 1. Colorado Pikeminnow and Razorback Sucker larvae for this study were selected from 2009 to 2017 larval fish collections made in the San Juan River between reach 6, near Farmington, NM, and reach 1, near the terminus of the San Juan River in Lake Powell.
FIG. 4 in Otolith Microstructure Analysis Elucidates Spawning and Early Life Histories of Federally Endangered Fishes in the San Juan River
FIG. 4. Back-calculated spawn dates of Colorado Pikeminnows produced from otolith ages (Plot B: Actual), from the transformed linear equations (Plot A: Best-fit), and from the published function (Nesler et al., 1988; Plot C: Published). Data are from larvae collected from 2010 to 2017 in the San Juan River. Dashed gray vertical bars denote weekly intervals.
US Fish and Wildlife Service Endangered Species Program
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Data from: "De novo assembled transcriptome of organs involved in reproduction in an endangered endemic Iberian cyprinid fish (Squalius pyrenaicus)" in Genomic Resources Notes Accepted 1 June 2015 to 31 July 2015
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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.