Download or read book A Study of Lake Sturgeon Acipenser Fulvescens Movements Abundance and Harvest in the South Saskatchewan River Alberta written by Recreation, Parks & Wildlife Foundation and published by . This book was released on 1991 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Survey of the Lake Sturgeon Acipenser Fulvescens Fishery on the South Saskatchewan River Alberta written by L. A. Winkel and published by Alberta Sustainable Resource Development, Fisheries & Wildlife Management Division, Resource Status and Assessment Branch. This book was released on 2000 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Movement and Habitat Use of Lake Sturgeon Acipenser Fulvescens in the South Saskatchewan River System written by Christine D Lacho and published by . This book was released on 2013 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Movements Habitat Use and Abundance of Lake Sturgeon Acipenser Fulvescens in Lake Champlain written by Lisa K. Izzo and published by . This book was released on 2021 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lake sturgeon (Acipenser fulvescens) in Lake Champlain were listed as endangered in 1972. Significant gaps exist in understanding lake sturgeon in the system as well as the methods needed to properly monitor and assess them. My research had three main goals: (1) investigate movements and habitat use of lake sturgeon in the Lake Champlain basin, (2) develop a method to estimate lake sturgeon abundance using sonar technology, and (3) test an alternative method for aging lake sturgeon. One of the primary information gaps for lake sturgeon in Lake Champlain is an understanding of the movements and habitat use of multiple life stages. I used acoustic telemetry to describe seasonal movement patterns and distribution of adult and juvenile lake sturgeon and to quantify the spatial overlap between these life stages. We found that juvenile and adult home ranges overlapped in shallow ( 10 m) water in the summer and fall. During the winter, adults remained in shallow water and juveniles moved to deep-water ( 25 m) overwintering sites. These results identified important areas for lake sturgeon and indicated that there are seasonal differences in habitat use between life stages. I also used acoustic telemetry to describe adult lake sturgeon movement patterns during the spawning period and to investigate environmental drivers of these movements in the Winooski River. River discharge, temperature, the magnitude and direction of the change in temperature (3-day lag), and time of day were significant factors in describing upstream movements. Adult lake sturgeon displayed general movement patterns that included a single run upstream, upstream and downstream movements throughout the river, or multiple runs made up the entire length of the spawning tributary to the spawning site. An understanding of the movements during the spawning period was key in the method I developed to estimate lake sturgeon abundance. To estimate abundance of lake sturgeon spawning in the Winooski River, I used acoustic telemetry data from adult lake sturgeon to estimate observation probability of the sonar and the probability that a lake sturgeon had been seen previously during the season. Using a Bayesian integrated model, I combined these parameters with counts from a dual-frequency identification sonar (DIDSON) to estimate abundances each year: 110 (47 -- 229 CI) in 2017, 133 (79 -- 242 CI) in 2018, and 99 (51 -- 220 CI). The results of this work represent the first estimate of abundance for spawning lake sturgeon in a Lake Champlain tributary, and will be key to tracking progress towards lake sturgeon recovery moving forward. Age data in long-lived species such as lake sturgeon can point to signs of successful recruitment and recovery. I investigated use of the second marginal pectoral fin ray as an alternative, less invasive method for estimating ages of lake sturgeon. The variability of age estimates among different readers and fin structures indicated that the second fin ray may provide some utility to age juvenile lake sturgeon but is not a viable substitute for estimating ages of adult lake sturgeon. These results provide valuable information to managers looking to gain essential age data while also decreasing the impact of handling endangered lake sturgeon.

Download or read book Seasonal Movements of Adult Lake Sturgeon Acipenser Fulvescens and Larval Abundance in the Manistee River Michigan written by Lauren H-N. Yeomans and published by . This book was released on 2002 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Harvest of Lake Sturgeon Acipenser Fulvescens from the South Saskatchewan River Alberta Between 1968 and 1978 written by Duane S. Radford and published by . This book was released on 1980 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Harvest of Lake Sturgeon Acipenser Fulvescens in the South Saskatchewan River from 1968 to 1972 written by Radford, D. S. (Duane S.) and published by Department of Lands and Forests. This book was released on 1972 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sustaining the Recovery of Lake Sturgeon Acipenser Fulvescens in the North Saskatchewan River of Alberta written by Owen B. Watkins and published by . This book was released on 2016 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nearly all Lake Sturgeon (Acipenser fulvescens) populations across North America have experienced losses to historic abundances estimated to be > 99%. This species is especially vulnerable to overharvest, habitat degradation, river fragmentation from dams, and is slow to recover due to life history characteristics. In the Alberta section of the North Saskatchewan River, Canada, passive management strategies led to overharvest, and combined with poor water quality, contributed to the collapse of the Lake Sturgeon population circa 1940. However, improved water quality beginning in the 1960s, along with the implementation of a zero-harvest regulation in 1997 prompted a Lake Sturgeon population recovery. Lake Sturgeon population viability remained questionable with low population abundance with particularly few adult fish, complicated by industrial development, and an increasing human population. Furthermore, the North Saskatchewan River has a popular multi-species sport fishery, complicating Lake Sturgeon management and recovery. My objective is to determine whether the status of the Lake Sturgeon population in the North Saskatchewan River in Alberta is declining, improving or remaining the same. To address this objective I required knowledge of Lake Sturgeon life history and sources of mortality. More specifically, I investigated: 1) population metrics for a status assessment, 2) a resource selection function for identification of important habitat using inputs from telemetry and land classification data, 3) defining technological limitations of telemetry information and 4) an assessment of current rates of angling mortality and management options for Lake Sturgeon recovery. I found that both recruitment and adult abundance had increased in the most recent years (2008 to 2012), even though the total mortality rate was higher than the 7% threshold proposed by the Alberta Lake Sturgeon Recovery Team. However, a high rate of somatic growth implies that abundance in the North Saskatchewan River is still below carrying capacity. Telemetry of 58 Lake Sturgeon over a 38-month period suggested that the population used the entire section of the North Saskatchewan River downstream from Drayton Valley, Alberta to the Alberta-Saskatchewan border. Additionally, some fish moved exceptional distances (> 925 rkm) between Alberta and Saskatchewan, illustrating the importance of river connectivity. Landscape classifications adjacent to the river were ineffective predictors of Lake Sturgeon congregations. There was a difference in habitat selection by males and females, with females found further downstream, but occupying similar slope gradients as the males. Small-scale details of habitat selection could not be investigated because of the technical limitations of existing telemetry technology. I found that radio telemetry detections from an aircraft were dependent upon transmitter type, water depth, receiver altitude, and scanning time. Larger transmitters were detected from a greater distance than smaller transmitters and the probability of detection was highest at a receiver altitude of 300 m when the two transmitter types were at a depth of 1 m. Furthermore, my relocations of the two transmitter types based upon maximum signal strength had a precision of ± 177 m distance for all depths and receiver altitudes from the actual transmitter location. I provide six probability of detection models for researchers to quantify their telemetry equipment. For investigating recovery management options, I used a theoretical objective of having a total population of 5,000 Lake Sturgeon, with an occasional fish surviving to 100-years. This requires total mortality to be approximately 5%, although my current estimate of total mortality is approximately 9.4%. To achieve my population objective, mortality must be significantly reduced. Estimates from catch and release fishing by three angler groups (non-specific anglers, anglers targeting sturgeon and research anglers) suggests that sport angling and its associated incidental mortality results in fewer than 18 dead Lake Sturgeon annually and further restrictions on sport angling are currently unnecessary. My only remaining management option to improve Lake Sturgeon survival is through habitat protection. My telemetry data suggested 10 primary locations of Lake Sturgeon congregations. Existing provincial regulations (Class 'A' watercourse designations) currently protect approximately 30% of these congregation sites. To protect at least 75% of these areas, I propose 10 new Class 'A' extents that reduce the total area of current Class 'A' protection (from 64 to 58 river km), which provides an improved means for protecting Lake Sturgeon and habitat.

Download or read book The 1974 Harvest of Lake Sturgeon Acipenser Fulvescens from the South Saskatchewan River Alberta written by Radford, D. S. (Duane S.) and published by Lethbridge, Alta. : Department of Recreation, Parks and Wildlife. This book was released on 1976 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The 1973 Harvest of Lake Sturgeon Acipenser Fulvescens from the South Saskatchewan River written by Radford, D. S. (Duane S.) and published by Department of Lands and Forests. This book was released on 1973 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The 1975 Harvest of Lake Sturgeon Acipenser Fulvescens from the South Saskatchewan River Alberta written by Duane S. Radford and published by Lethbridge, Alta., Canada : Fish and Wildlife Division, Department of Recreation, Parks, and Wildlife. This book was released on 1977 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Life History Habitat and Distribution of the Lake Sturgeon Acipenser Fulvescens in the South Saskatchewan River Alberta written by Gordon Neal Haugen and published by . This book was released on 1969 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Life History Habitat and Distribution of the Lake Sturgeon Acipenser Fulvescens in the South Saskatchewan River Alberta written by Gordon Neal Haugen and published by Fish and Wildlife Division, Department of Lands and Forests. This book was released on 1969 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Lake Sturgeon in the Lower Saskatchewan River Radio tracking and Index Fishing 1994 to 1997 written by Douglas R. Leroux and published by Saskatoon : Fish and Wildlife Branch, Saskatchewan Environment and Resource Management. This book was released on 1999 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Early Life History Dynamics of Lake Sturgeon written by David Carl Caroffino and published by . This book was released on 2009 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Populations of lake sturgeon Acipenser fulvescens in the Laurentian Great Lakes have not recovered after dramatic declines in the late 1800s despite the implementation of numerous recovery plans. Although extensive lake sturgeon research has and continues to occur, critical knowledge gaps remain. Recruitment of lake sturgeon is variable, but the extent of that variation, its limiting factors, and mortality rates experienced by early life stages are unclear. The purpose of this study was to increase our understanding of lake sturgeon early life stages by examining characteristics of a remnant population in the Peshtigo River, Wisconsin. Specifically, this research sought to empirically estimate rates of early life stage mortality, describe the vertical distribution of drifting larvae, evaluate the impacts of predation on recruitment, and describe patterns in movement and abundance of age-0 juveniles. Extensive sampling of lake sturgeon eggs, larvae, age-0 juveniles, and potential predators occurred during 2006 and 2007. Although drifting lake juveniles potential during sturgeon larvae were captured in all parts of the water column, more were found near the Surface than the substrate. After drifting to nursery areas, individuals exhibited variable movement patterns. Some fish were never recaptured more than 10 m from the initial capture site, while other individuals moved more than 9 km. Even though absolute abundance of juveniles differed by an order of magnitude between 2006 and 2007, a pattern of steady decline during the summer months was similar during both years. This downstream movement may have resulted in emigration from the Peshtigo River, as there was no evidence of predation on this life stage. Overall mortality from the egg to age-0 juvenile life stage exceeded 99.9% in both study years. Predation on eggs was extensive by both crayfish and fish (white sucker Catostomus commersonii), but was minimal on other life stages. These results suggest that recruitment can vary significantly, and predation is likely only limiting at the egg life stage. These results will allow more effective monitoring and management of lake sturgeon early life stages, thereby promoting population recovery"--Leaves iii-iv.

Download or read book Growth Patterns and Movements of Adult Lake Sturgeon Acipenser Fulvescens in a Deep Impounded River written by Holly Christina Labadie and published by . This book was released on 2012 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Population Characteristics Habitats and Movements of Lake Sturgeon Acipenser Fulvescens in the Lower Niagara River written by Thomas C. Hughes and published by . This book was released on 2002 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: