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Showing 1 to 19 of 19 for “"rockfish"”.
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Geochemical and petrologic study of the Fries-Rockfish Valley Fault near Roanoke, Virginia
… northeast-trending and southeast dipping Fries-Rockfish Valley Fault Zone, exposed as a 1-10 km wide shear zone, formed during the middle Paleozoic Taconic Orogeny (425-450 Ma.). These terranes are referred to as the Pedlar massif, a high-grade granulite terrane, to the northwest and the …
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Angling for Insight: Examining the Recreational Fishing Community's Knowledge, Perceptions, Practices, and Preferences to Inform Rockfish Recovery Planning in Puget Sound, Washington
… = 443) was developed to this end with respect to rockfish (Sebastes spp.) in Puget Sound, Washington. Survey results discuss anglers' relative knowledge of rockfish life history, regulations, and species familiarity; perceptions about threats to rockfish; fishing practices; and preferences for …
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Effects of Barotrauma on Four Species of Pacific Rockfishes (<i>Sebastes Spp.</i>)
<p>Physoclistic fish, such as Pacific rockfishes (genus <em>Sebastes</em>), have closed swim bladders that help them regulate their buoyancy. When anglers catch these fish and reel them to the surface, gases within their swim bladder expand due to the decrease in pressure. This can cause their swim …
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Determining the Usefulness of Aerobic and Anaerobic Enzyme Assays as Proxies for Rockfish Ecological Data.
Rockfish are commercially and recreationally important, yet due to the in habitat depths at which rockfish inhabit, little is known about their ecology. As a consequence, management of rockfish population as a fishery resource is a work in progress. In particular, changes in physiological condition …
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The Insulin-Like Growth Factor-1 (IGF1) System as a Potential Biomarker for Nutritional Status and Growth Rate in Pacific Rockfish (SEBASTES SPP.)
… serve as an indicator of somatic growth in olive rockfish (<em>Sebastes serranoides</em>), one species among dozens of rockfishes important to commercial and recreational fisheries in the Northern Pacific Ocean. I reared juvenile olive rockfish under food ration treatments of 1% or 4% wet mass per …
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Spatial and Temporal Comparisons of Gopher Rockfish (Sebastes carnatus) Life History and Condition in South Central California
… local fisheries management strategies. Gopher rockfish,<em> Sebastes carnatus</em>, comprise 50% of the estimated shallow nearshore recreational rockfish catch in California, yet insufficient local data exist regarding life history traits and condition of this species. Our study locally defines …
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Spatial and Temporal Variation in Growth Rate of Blue Rockfish (Sebastes mystinus) in Nearshore Central California Determined Using a Physiological Biomarker
… spatial and temporal variation in growth of Blue Rockfish (<em>Sebastes mystinus</em>) along nearshore central California, USA. Blue Rockfish were sampled between 2016 and 2018 from two different regions ~60 km apart on the central coast of California: the Piedras Blancas region and the Point …
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Comparisons of Fish Species Inside and Outside of Marine Protected Areas off the South Central Coast of California
… commercial fishing protocol and black and yellow rockfish (<em>Sebastes chrysomelas</em>) had a significantly higher CPUE (310%) using the MLPA monitoring protocol. These findings provide a means of maintaining data continuity across the entire sample region and inclusion of earlier projects in …
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Evaluating eelgrass (Zostera marina) as a juvenile habitat for rockfishes : contributions of site characteristics and larval supply to juvenile abundance
… ecosystems with a potential nursery function for rockfishes in British Columbia. Understanding how the nursery value of seagrass habitats differs for rockfish species, and what factors create this variability in habitat value, is important for effective conservation planning. In this study, the …
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Real-Time PCR Combined with DNA Barcoding for the Authentication of Red Snapper (Lutjanus campechanus) Fillets
… substituted with other fish, such as tilapia, rockfish, and other snapper species. DNA barcoding is typically used by regulatory agencies to detect seafood substitution; however, it is expensive and time-consuming. A rapid, real-time PCR assay targeting red snapper was developed previously for …
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The Response of a Predatory Fish, Ophiodon elongatus, to a Marine Protected Area: Variation in Diet, Catch Rates, and Size Composition
… and some of its prey species, such as rockfish (<em>Sebastes</em> spp.), are species that are protected from fishing in some California MPAs. Lingcod is an apex predator that consumes a variety of fish and invertebrate species. In this study, I sought to assess the effect of an MPA on …
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Pre-Grenville ages of basement rocks in central Virginia: a model for the interpretation of zircon ages
… metamorphism occurred at least 913 m.y. ago. The Rockfish granodiorite, in Nelson County, Virginia, intruded these older basement rocks 820 ± 20 m.y. ago and appears to be coeval with the extensive Catoctin and Mt. Rodgers volcanic rocks. Because of the complex geologic history of this area, two …
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A Spatial Analysis of Changes in Recreational Fishing Pressure on the Central Coast of California Subsequent to MPA Implementation
… that target nearshore fish species, primarily rockfish. We assessed shifts in the spatial distribution of fishing effort over a 10-year period that includes pre- and post-implementation observations of the California MPA network along the Central Coast. We visually depict fine-scale annual …
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Space-Time Analysis of Magmatism: Evidence for a Early Cryogenian Plume Track in Eastern Laurentia
… Dillons Mill, Stewartsville, Mobley Mountain, Rockfish River, and Fine Creek Mills plutons. These two age groups also display differences in geochemistry. In contrast to the older group of plutons, the younger plutons are characteristically more metaluminous, lower in silica, higher in aluminum …
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Isotopic systematics and mass transfer in amphibolite-grade mylonites
… extremes: the mid-Paleozoic, greenschist-grade Rockfish Valley Fault Zone, and the PennsylvanianPermian amphibolite-grade Hope Valley Shear Zone. In the mylonites of the Rockfish Valley Fault Zone, zircons underwent brittle failure and were comminuted in the ductilely deforming matrix. …
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Spatial and ecological patterns of mercury and arsenic concentrations in Pacific Ocean Perch (Sebastes alutus) from British Columbia
… alutus) is a slow growing species of demersal rockfish, which inhabits the continental slope of the west coast of North America. This species represents a highly commercial fishery and an important part of the groundfish fishery of British Columbia. A variety of biological factors are known to …