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Showing 1 to 20 of 70 for “"sturgeon"”.
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SCAPHIRHYNCHUS STURGEON EARLY-LIFE HISTORY
Rehabilitation of sturgeon populations requires an understanding of sturgeon autecology during all life stages, especially during early life when high mortality occurs. To begin to understand sturgeon early-life history I determined river of origin on a multi-basin scale (i.e., potential rivers of …
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Population Characteristics and Seasonal Movements of Shortnose Sturgeon in the Lower Ogeechee River, Georgia, with Notes on Atlantic Sturgeon
<p>Shortnose sturgeon, <em>Acipenser</em> <em>brevirostrum</em>, were monitored as part of continuing studies in the Ogeechee and Canoochee Rivers adjacent to Fort Stewart, Georgia during 1999 and 2000. Over 13,000 net-meter-hours soak time and 1,700 person hours of effort were expended. The …
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ECOLOGY AND COEXISTENCE OF SCAPHIRHYNCHUS STURGEON AT MULTIPLE SCALES
… declines of many fluvial dependent species. Sturgeons are a group of fluvial dependent species affected by river modifications and may be the most imperiled group of species on Earth. Most sturgeons are threatened across the globe due to a combination of unregulated harvest and habitat loss. …
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Lake Sturgeon Biology in Rainy Lake, Minnesota and Ontario
Rainy Lake contains a native population of lake sturgeon Acipenser fulvescens that has gone largely unstudied. The objectives of this study were to document the population characteristics of lake sturgeon in Rainy Lake, determine spawning locations and generalized lake sturgeon movement patterns …
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Sampling Techniques for Juvenile Pallid Sturgeon and the Condition and Food Habits of Sturgeon in the Missouri River Below Fort Randall Dam, South Dakota
… to recover the currently endangered pallid sturgeon Scaphirhynchus albus. Efforts have been made to stock hatchery-reared juvenile pallid sturgeon (HRJPS) throughout the Missouri River to help facilitate recovery and long-term monitoring programs were established to evaluate sturgeon …
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Predation Vulnerability and Trophic Interactions of Pallid Sturgeon Scaphirhynchus albus
Recruitment of the federally endangered pallid sturgeon Scaphirhynchus albus in the Missouri River has been absent or at levels too low to sustain the population. Mortality of juvenile fishes is often greatest during their first year of life, and may have large implications for recruitment dynamics …
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Filling Conservation Gaps For Gulf Sturgeon (Acipenser desotoi) Using Specialized Acoustic Transmitters
<p>Gulf Sturgeon (GS; <em>Acipenser desotoi</em>) are a federally threatened, anadromous fish found in seven river systems along the northern Gulf of Mexico. While not managed as distinct population segments, GS are divided into western (WPU) and eastern (EPU) populations based on the location of …
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Habitat Selection and Movement of Pallid Sturgeon in Lake Sharpe, South Dakota
… habitat selection and movement of pallid sturgeon, Scaphirhynchus albus, in Lake Sharpe, South Dakota, a Missouri River reservoir. Seven pallid sturgeon, (three < 5 kg and four 5 kg) were implanted with sonic tags and followed between June 1989 and October 1991. Pallid sturgeon selected …
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Intertidal Habitat Utilization by Endangered Green Sturgeon (Acipenser medirostris), Willapa Bay, Washington
… southern distinct population segment of green sturgeon (Acipenser medirostris) in Willapa Bay, Washington. Willapa Bay is an intermediate size (258.7mi2) estuary on the southwest coast of Washington State, approximately 30 miles north from the mouth of the Columbia River. Recent studies …
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Juvenile and subadult Gulf Sturgeon (Acipenser desotoi) use of the Pascagoula River estuary
<p>Gulf Sturgeon (GS) are an anadromous species currently listed as “Threatened” under the Endangered Species Act. They reside in habitats across the northern Gulf of Mexico including coastal rivers, estuaries, and marine waters, making annual migrations between freshwater and marine habitats for …
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The Development and Application of a Larval Pallid Sturgeon (Scaphirhynchus albus) Bioenergetics Model
<p>Pallid Sturgeon Scaphirhynchus albus are native fish of the Missouri and lower Mississippi River basins and currently listed as an endangered species under the Federal Endangered Species Act. As a result of anthropogenic alterations within the Missouri River, including dredging, channelization, …
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GROWTH PATTERNS AND SIZE-GROUP INTERACTIONS IN HATCHERY-REARED AGE-0 LAKE STURGEON
<p>Raising lake sturgeon (<em>Acipenser fulvescens</em>) in hatcheries is an important tool for rehabilitation and conservation, but is expensive. When hatchery sturgeon do not grow large enough before stocking, their odds of survival decline significantly and resources are wasted. We investigated …
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Influence of Diet and Environmental Variation on Physiological Responses of Juvenile Pallid Sturgeon (Scaphirhynchus albus)
Shortly after the pallid sturgeon Scaphirhynchus albus was listed as federally endangered in 1990, a recovery plan was drafted to outline efforts to restore the pallid sturgeon throughout its’ native range in the Missouri and middle and lower Mississippi rivers. The plan set forth a number of …
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The effects of metal contamination on larval white sturgeon in the upper Columbia River
Sturgeon populations are imperiled worldwide. Declines are attributed to many factors including habitat degradation and alteration, overexploitation, and contamination. In North America, white sturgeon (Acipenser transmontanus) populations in the upper Columbia River (UCR) face many of the same …
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Determinants of Growth and Survival of Larval Pallid Sturgeon: A Combined Laboratory and Field Approach
… was identified as potential cause for pallid sturgeon Scaphirhynchus albus recruitment failure. Consequently, recovery effort has focused on habitat restoration, however, ecological requirements of larval pallid sturgeon are largely unknown. To inform recovery efforts, we studied the …
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Lake Sturgeon (Acipenser fulvescens) Population Attributes, Reproductive Structure, and Distribution in Namakan Reservoir, Minnesota and Ontario
Population declines of lake sturgeon (Acipenser fulvescens) have resulted in their protected status as a species of special concern in the state of Minnesota and threatened in the province of Ontario. Water bodies that lie along the Minnesota-Ontario border are home to historic populations of lake …
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