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51 results for “Rockfish”
Nematode parasites of rockfish (Sebastes spp.) and cod (Gadus spp.) from waters near Kodiak Island Alaska, USA
<p>Distribution and abundance of common parasitic nematodes in marine fishes is not well documented in many geographic regions. Understanding the influence of large-scale environmental changes on infection rates of fish by nematodes requires quantitative assessments of parasite abundance for multiple host species. We collected samples of two species of cod and eight species of rockfish (total of 232 specimens) from waters near Kodiak Island, Alaska, USA during Spring and Summer of 2015, and dissected and recorded all internal nematode parasites. We quantified the prevalence and intensity of nematode parasites in the ten host species, and tested for differences in prevalence among host species. We found three species of nematode: Anisakis simplex, sensu lato (Van Thiel), Pseudoterranova decipiens, sensu lato (Krabbe), and Hysterothylacium sp. (Ward and Magath). Eighty-two percent of the examined fish were infected with at least one parasitic nematode. The overall prevalence of P. decipiens, A. simplex, and Hysterothylacium sp. was 56%, 62%, and 2%, respectively. Anisakis simplex and P. decipiens were abundant and present in all ten species of host fish examined, whereas Hysterothylacium sp. was rare and found in only five of the host fish species. Prevalence and mean intensity of P. decipiens and A. simplex varied across the ten host species, and the number of parasites varied substantially among individual hosts within host species. The mean intensity of P. terranova and A. simplex in our study was substantially higher than the mean intensity for these same species from multiple other locations in a recent meta-analysis. This study provides a baseline of nematode parasite abundance in long-lived fish in waters near Kodiak Island, AK, and fills an important gap in our quantitative understanding of patterns of occurrence and abundance of these common and widespread parasites of marine fish.</p>
Rockfish Genome Project Data V1
<p>Annotation files and scaffolds for genomes generated for the Rockfish Genome Project</p>
Rockfish chromosome reference assemblies (Kolora et al 2021)
<p>Rockfish chromosome reference assemblies from Kolora et al 2021. These are also uploaded on NCBI however NCBI renamed the contigs making them incompatible with the annotation GFFs. These references have the original contig names and are thus compatible with the annotation GFFs found here https://doi.org/10.5281/zenodo.5534983.</p>
Data from: Temporal variability in the environmental and geographic predictors of spatial-recruitment in nearshore rockfishes
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Data from: Large parasites in a crowded space: variation in prevalence and volumetric effects of <em>Sarcotaces arcticus</em> (Collett, 1874) in two host rockfish (<em>Sebastes</em> spp.) species.
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Data from: Comparative population genetic analysis of bocaccio rockfish Sebastes paucispinis using anonymous and gene-associated simple sequence repeat loci
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Data from: Estimation of genotyping error rate from repeat genotyping, unintentional recaptures and known parent-offspring comparisons in 16 microsatellite loci for brown rockfish (Sebastes auriculatus)
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Data from: Sex matters: Otolith shape and genomic variation in deacon rockfish (Sebastes diaconus)
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Data from: Evaluation of rockfish conservation area networks in the United States and Canada relative to the dispersal distance for black rockfish (Sebastes melanops)
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Variation in isotopic trophic niche of sablefish (Anoplopoma fimbria) and shortraker rockfish (Sebastes borealis) in the Northeast Pacific
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Nematode parasites of rockfish (Sebastes spp.) and cod (Gadus spp.) from waters near Kodiak Island Alaska, USA
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Data from: Replicate divergence between and within sounds in a marine fish: the copper rockfish (Sebastes caurinus)
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Data from: The geography of morphological convergence in the radiations of Pacific Sebastes rockfishes
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Data from: Shortspine thornyhead and rockfish (Scorpaenidae) distribution in response to substratum, biogenic structures and trawling
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Data from: Extensive hybridization and associated geographic trends between two rockfishes Sebastes vulpes and S. zonatus (Teleostei: Scorpaeniformes: Sebastidae)
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Comparative shape of two recently diverged species of Pacific Rockfish: Sebastes ciliatus and S. variabilis
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Data from: Genomic characterization of sex-identification markers in Sebastes carnatus and Sebastes chrysomelas rockfishes
Fish have evolved a variety of sex-determining (SD) systems including male heterogamy (XY), female heterogamy (ZW) and environmental SD. Little is known about SD mechanisms of Sebastes rockfishes, a highly speciose genus of importance to evolutionary and conservation biology. Here, we characterize the sex determination system in the sympatrically distributed sister species Sebastes chrysomelas and Sebastes carnatus. To identify sex-specific genotypic markers, double digest restriction site – associated DNA sequencing (ddRAD-seq) of genomic DNA from 40 sexed individuals of both species was performed. Loci were filtered for presence in all of the individuals of one sex, absence in the other sex and no heterozygosity. Of the 74 965 loci present in all males, 33 male-specific loci met the criteria in at least one species and 17 in both. Conversely, no female-specific loci were detected, together providing evidence of an XY sex determination system in both species. When aligned to a draft reference genome from Sebastes aleutianus, 26 sex-specific loci were interspersed among 1168 loci that were identical between sexes. The nascent Y chromosome averaged 5% divergence from the X chromosome and mapped to reference Sebastes genome scaffolds totalling 6.9Mbp in length. These scaffolds aligned to a single chromosome in three model fish genomes. Read coverage differences were also detected between sex-specific and autosomal loci. A PCR-RFLP assay validated the bioinformatic results and correctly identified sex of five additional individuals of known sex. A sex-determining gene in other teleosts gonadal soma-derived factor (gsdf) was present in the model fish chromosomes that spanned our sex-specific markers.
Fig. 2 in First Record of the Rockfish Sebastes melanops from the Western North Pacific, with Comments on its Synonymy (Osteichthyes: Scorpaenoidei: Sebastidae)
Fig. 2. Color photographs of fresh specimens of Sebastes melanops. A: FAKU 134856, 455.0 mm SL, Miyako, Iwate, Japan; B: uncollected specimen, Miyako, Iwate, Japan.
Fig. 1 in First Record of the Rockfish Sebastes melanops from the Western North Pacific, with Comments on its Synonymy (Osteichthyes: Scorpaenoidei: Sebastidae)
Fig. 1. Distribution of Sebastes melanops based on literature records (shaded area) and collection sites of specimens examined (symbols). Open star: syntypes of S. melanops; solid star: syntypes of S. melanops and S. columbianus; open circles: other material.
Figure 6 from: Liu L, Zhang X, Li C, Zhang H, Yanagimoto T, Song N, Gao T (2019) Population genetic structure of Marbled Rockfish, Sebastiscus marmoratus (Cuvier, 1829), in the northwestern Pacific Ocean. ZooKeys 830: 127-144. https://doi.org/10.3897/zookeys.830.30586
Figure 6 Bayesian skyline plot showing the effective female S.marmoratus population size through time. Black solid lines are median estimates of NeT (Ne=effective female population size; T=generation time); blue shading represents the 95% confidence interval of NeT. The y-axis was plotted on a logarithmic scale.
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