Download or read book Age Structure Reproduction and Recruitment of Atlantic Sturgeon Acipenser Oxyrinchus and Shortnose Sturgeon Acipenser Brevirostrum in the Cooper River South Carolina written by Victoria Kate Ruddle and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This study investigated the age structure, recruitment, and reproduction of two endangered anadromous fish species, Atlantic Sturgeon (Acipenser oxyrinchus) and Shortnose Sturgeon (Acipenser brevirostrum), in the Cooper River in South Carolina. The second marginal pectoral fin ray was evaluated as a new ageing technique, and validated in hatchery-raised Atlantic Sturgeon. There was no significant difference between side sampled (left vs. right pectoral fins) in Atlantic Sturgeon (n = 47, t = 0.000, p = 1.00) and Shortnose Sturgeon (n = 48, t = 1.1985, p = 0.2367). Shortnose Sturgeon sampled were estimated to be between 13 to 41 yrs old (N = 39) and Atlantic Sturgeon sampled were estimated to be between 3 to 21 yrs old (N = 9). Reproductive surveys resulted in one Shortnose Sturgeon egg collected in 2015 and 14 eggs collected in 2017. No Atlantic Sturgeon eggs were collected, but spawning adults were sampled at the spawning site in the Cooper River.

Download or read book Recruitment of Atlantic Sturgeon and Shortnose Sturgeon Within the Savannah River Georgia and South Carolina written by Alexander Jeffrey Cummins and published by . This book was released on 2018 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: The endangered Atlantic (Acipenser oxyrinchus oxyrinchus) and Shortnose Sturgeons (A. brevirostrum) were once abundant within major rivers along North America's Atlantic coast from the St. John River, Canada and the St. Johns River, Florida. Anthropogenic factors such as over-harvest and habitat degradation have contributed to severe declines in populations of both species throughout their ranges. Despite both species being listed as endangered, significant gaps in scientific literature, particularly population demographics are still present. The objectives of this study are to quantify annual recruitment of juvenile Atlantic and Shortnose Sturgeons in the Savannah River, and to determine environmental drivers of recruitment. The results of this study provide baseline abundance data that will be critical in evaluating long-term population trends and for assessing the effects of dredging in the Savannah River. This study provides key information regarding long-term management of endangered Atlantic and Shortnose Sturgeon throughout the southern reaches of their range.

Download or read book Species Profiles written by Carter Rowell Gilbert and published by . This book was released on 1989 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Population Characteristics of Atlantic Sturgeon and Shortnose Sturgeon in the Savannah River Georgia written by Derek Lawrence Bahr and published by . This book was released on 2015 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atlantic Sturgeon (Acipenser oxyrinchus oxyrinchus) and Shortnose Sturgeon (A. brevirostrum) once thrived along the Atlantic Coast of North America. Severe overfishing and habitat loss during the 1900s resulted in major population declines that led to the listing of both species under the U.S. Endangered Species Act of 1973. Presently, quantified abundance data is lacking for most systems, particularly at southerly latitudes. From 2013 to 2014, I collected mark-recapture data for both Shortnose and juvenile Atlantic Sturgeon occupying the Savannah River, Georgia. The results of this study provide the first quantified recruitment and abundance estimates for the Savannah River. These estimates are critical in evaluating the conservation status of these species and may allow researchers to evaluate trends in abundance and recruitment among and within rivers over time. Furthermore, the results of this study provide key information for proper management of these imperiled species in the southern portion of their range.

Download or read book Atlantic Sturgeon written by Michael J. Van Den Avyle and published by . This book was released on 1984 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Review of Biology and Culture of Atlantic Sturgeon Acipenser Oxyrhynchus and Shortnose Sturgeon A Brevirostrum written by Theodore Isaac Jogues Smith and published by . This book was released on 1984* with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Social Behaviour Competition and Interactions of Juvenile Shortnose Sturgeon Acipenser Brevirostrum and Atlantic Sturgeon A Oxyrhynchus written by Alisha Victoria Giberson and published by . This book was released on 2004 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Age Growth and Recruitment of Hudson River Shortnose Sturgeon Acipenser Brevirostrum written by Ryan J. Woodland and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Life History Analysis of James River Atlantic Sturgeon Acipenser Oxyrinchus Oxyrinchus with Implications for Management and Recovery of the Species written by Matthew Thomas Balazik and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Sturgeon species (family Acipenseridae) are threatened globally due to habitat destruction, pollution, and overfishing. The Atlantic sturgeon Acipenser oxyrinchus oxyrinchus was listed as a federally endangered species in 2012. Atlantic sturgeon have a complex life history that utilizes a wide range of habitats. Timing of life history varies in different areas requiring each population to be studied. Very little work has been published on Atlantic sturgeon reproduction in the James River, Virginia. To aid the recovery of James River Atlantic sturgeon, aspects of life history need to be addressed. To increase understanding of Atlantic sturgeon life history a length at age model was created to show population structure and age of sexual maturity. Telemetry experiments were conducted to determine what types of boats are likely to cause boat strike mortalities of adult fish during a spawning season. Morphometrics, sperm characteristics, and telemetry data were used to determine if Atlantic sturgeon have a fall spawning season. Strontium/calcium ratio analysis was conducted on Atlantic sturgeon fin spines to better understand migration patterns. Cortisol levels were examined in Atlantic sturgeon exposed to M.S.222, electronarcosis or no anesthetic 1 and 24 hr after a small incision mimicking tag implantation. I also determined the feasibility of using electronarcosis in the field and the effect of salinity on electronarcosis. The length at age data show male Atlantic sturgeon beco, e sexually mature at age 10 y and females around age 15 y. Telemetry data showed that deep draft ocean-cargo ships are most likely responsible for boat strike mortalities and there is a greater chance of Atlantic sturgeon being hit in the narrow portion of the river. Electronarcosis is an effective anesthetic and has various attributes that make it better suited for field applications then frequently used chemical anesthetics. The data generated from this research will help management produce effective recovery plans and create a safer research environment for both the fish and researcher.

Download or read book Seasonal Occurrence and Movements of Atlantic Sturgeon acipenser Oxyrinchus Oxyrinchus in Georgia and Florida written by Adam Gregory Fox and published by . This book was released on 2018 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Atlantic Sturgeon (Acipenser oxyrinchus oxyrinchus) is a federally endangered anadromous fish that historically occurred along the Atlantic coast of North American from Canada to Florida. Through the 20th century, overharvest and dam construction resulted in range-wide population declines. Despite two decades of federal protection, many populations have not recovered, and information about the status of many populations is lacking, especially in the Southeastern United States. Recruitment may be a bottleneck for recovery, but habitat use by early juveniles is not well understood. The objectives of this study were to 1) assess the status of Atlantic Sturgeon populations in the St. Johns River in Florida and the St. Marys River in Georgia, at the southern margin of the species' range, and 2) describe seasonal movement by juvenile Atlantic Sturgeon in the Ogeechee, Altamaha, and Satilla Rivers in Georgia. Sturgeon were captured using monofilament gill and trammel nets, and some individuals were tagged with surgically-implanted acoustic transmitters. Fish movements were monitored using an array of passive acoustic receivers distributed throughout the lower river and estuary of each system. We found no evidence of an extant population of Atlantic Sturgeon within the St. Johns River system, but did document the presence of young juveniles in the St. Marys River. Those fish represent a small, but genetically distinct population in a river where the species had previously been thought extirpated. Our results also indicated that both rivers continue to provide seasonally important habitat for migrating adults from other populations. Tagged age-1 river-resident juvenile sturgeon in the Ogeechee, Altamaha, and Satilla Rivers exhibited similar patterns of seasonal habitat use 0́3 during the summer, fish were concentrated in upriver portions of nursery habitat, but during the winter they dispersed downriver and used more polyhaline habitat. Also during the winter of age-2, at least 30% of tagged fish outmigrated from their natal river. These results provide important information for management agencies regarding the status of Atlantic Sturgeon in the two southernmost rivers in their range, as well as helping to fill knowledge gaps about juvenile habitat use and outmigration.

Download or read book Seasonal Movement Reproduction and Artificial Spawning of Shortnose Sturgeon Acipenser Brevirostrum from the Connecticut River written by John L. Buckley and published by . This book was released on 1982 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Habitat Utilization of Atlantic Sturgeon Acipenser Oxyrinchus Oxyrinchus in the Delaware River Bay and Coastal Atlantic Ocean written by Matthew W. Breece and published by . This book was released on 2017 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Animals utilize various environments throughout their life cycle to optimize growth, fitness, and survival. These environments are their habitats. As the lifecycle of an organism progresses, the resources needed, and thus the habitats preferred will change to fulfill the new requirements of the given life history stage. Resource needs for many organisms will also vary seasonally in both composition and specificity requiring organisms to shift their habitats to fulfill changing needs throughout the year. Incorporating species occurrence observations and environmental properties enables species distribution models to reliably estimate habitat locations. Destruction of habitat and overfishing beginning in the late 19th century severely depleted Atlantic Sturgeon populations. Subsequent to the boom and bust period of exploitation, there has been minimal fishing pressure and improving habitats. However, lack of recovery led to the 2012 listing of Atlantic Sturgeon under the Endangered Species Act. In this dissertation I utilize various sources of environmental data, species distribution modeling, and acoustic biotelemetry to gain insight into the occurrence and habitat use of adult Atlantic Sturgeon to further their protection and promote efficient resource management. ☐ To estimate adult Atlantic sturgeon spatial distributions during riverine occupancy in the Delaware River, I utilized a maximum entropy approach along with passive biotelemetry during the likely spawning season. I found that substrate composition and distance from the salt front significantly influenced the locations of adult Atlantic Sturgeon in the Delaware River. The movement of the salt front upstream as a result of dredging and climate change likely eliminated historic spawning habitats and currently threatens areas where Atlantic Sturgeon spawning may still be taking place. ☐ In the Delaware Bay I found that movement and residency patterns were driven primarily by depth, bottom temperature, and location. These findings revealed that as temperatures warm in the summer Atlantic Sturgeon maintain residency in deep areas near the mouth of the Delaware Bay where upwelling offshore waters keep bottom temperatures cooler than surrounding area. As water temperatures begin to cool in the fall this pattern of residency turns back into movement. ☐ By placing Atlantic Sturgeon in the context of dynamic, objective, and globally conservative seascapes, in a manner similar to landscape partitioning in the terrestrial environment, I was able to link Atlantic Sturgeon occurrence to one particular seascape associated with terrigenous input during their spring migration. To verify the seascape findings from the passive acoustic array I deployed an autonomous underwater vehicle to dynamically sample the seascape distribution in the coastal ocean to confirm the original hypothesis of selection for a given seascape. ☐ To expand the prediction of Atlantic Sturgeon occurrence for the entire seasonal cycle I matched fisheries independent biotelemetry observations of Atlantic Sturgeon with daily satellite observations to construct a time resolved spatial distribution model of Atlantic Sturgeon. I determined that depth, day-of-year, sea surface temperature, and light absorption by seawater are the most important predictors of Atlantic sturgeon occurrence. I found strong spatial differences in spring and fall migration patterns, when anthropogenic interactions peak. Cross-validated models correctly identified > 88% of biotelemetry observations in this study region and my models also correctly identified ~67% of fisheries dependent observations throughout the year. However, during their migrations, when harmful interactions were highest, models correctly identified ~91% of fisheries dependent observations. ☐ The Delaware Bay and River once supported the largest population of sturgeon in North America but due to anthropogenic impacts this population segment is severely depleted. Recent measures have aided to stabilize Atlantic Sturgeon populations but without further protection for habitats, such as those highlighted by this dissertation, recovery may never be realized. I strongly suggest that the dynamic models created in this body of work be used for guidance to managers and stakeholders to reduce interactions with this highly imperiled species thereby enhancing conservation and recovery efforts.

Download or read book Modeling the Spatial and Temporal Resource Use by Shortnose Sturgeon acipenser Brevirostrum Throughout the Species Life History written by Sima Usvyatsov and published by . This book was released on 2012 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Collection des portraits des principaux personnages qui figurent dans l affaire Fualdes written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fishery Management Plan for Atlantic Sturgeon Acipenser Oxyrhynchus Oxyrhynchus written by Stephen H. Taub and published by . This book was released on 1990 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Life History Ecology Culture and Management of the Atlantic Sturgeon Acipenser Oxyrhynchus Oxyrhynchus Mitchell in South Carolina written by Theodore Isaac Jogues Smith and published by . This book was released on 1982 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Identification of Critical Habitat Requirements of Shortnose Sturgeon in South Carolina written by Theodore Isaac Jogues Smith and published by . This book was released on 1993 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: