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Book Evaluating Walleye Sander Vitreus Thermal and Optical Habitat Occupancy in Northern Wisconsin Lakes Using Two Forms of Technology

Download or read book Evaluating Walleye Sander Vitreus Thermal and Optical Habitat Occupancy in Northern Wisconsin Lakes Using Two Forms of Technology written by Benjamin R. Vasquez and published by . This book was released on 2024 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Spawning Habitats of Walleyes Sander Vitreus in Lake Bemidji Minnesota

Download or read book Spawning Habitats of Walleyes Sander Vitreus in Lake Bemidji Minnesota written by Matthew J. Sperry and published by . This book was released on 2006 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Radio telemetry, larval fish sampling, egg baskets, and scapnetting were utilized to determine walleye Sander vitreus spawning sites in Lake Bemidji, Minnesota, during the spring spawning periods of 2002 through 2004. Some walleye populations travel from their lake environments into rivers or streams to spawn, but Lake Bemidji walleyes appear to be lake spawners. No tracked walleyes were found in river habitats during the 2002 spawning season. Based on radio telemetry, six putative spawning areas were located: Rocky Point at Lake Bemidji State Park, northwestern shore of the north basin, weed beds (bulrush Scirpus spp.) on each side of the Mississippi River outlet on the east side of the lake, Diamond Point, and the ridge between Diamond Point and the outlet of the Mississippi River. The greatest concentration of spawning walleyes occurred along the ridge between Diamond Point and the outlet of the Mississippi River in relatively shallow water over more coarse substrate than is typically found in the lake. No walleye eggs were found in egg baskets placed in putative spawning areas during 2003, but one was found by scapnetting on the ridge off of Diamond Point during spring 2004. These methods were conducted in shallow waters less than 1.5 m deep. Spawning shoals may be relatively small and isolated in waters deeper than 1.5 m. further studies utilizing a combination of SCUBA or an underwater video camera and scapnetting should be conducted to pinpoint spawning sites in deeper waters. Based on the presence of adequate natural recruitment, the amount of walleye spawning habitat does not appear to be limiting. Thus, habitat enhancement is not recommended at this time.

Book Biology Management and Culture of Walleye and Sauger

Download or read book Biology Management and Culture of Walleye and Sauger written by Bruce A. Barton and published by . This book was released on 2011-01-01 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Evaluation of the Intraspecific Effects of a 15 inch Minimum Size Limit on Walleye Sander Vitreus Populations in Northern Wisconsin

Download or read book Evaluation of the Intraspecific Effects of a 15 inch Minimum Size Limit on Walleye Sander Vitreus Populations in Northern Wisconsin written by Michelle Lee LeBeau and published by . This book was released on 2004 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Zooplankton of the Great Lakes

Download or read book Zooplankton of the Great Lakes written by Mary D. Balcer and published by Univ of Wisconsin Press. This book was released on 1984 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: Researchers, instructors, and students will appreciate this compilation of detailed information on the crustacean zooplankton of the Great Lakes. The authors have gathered data from more than three hundred sources and organized into a useful laboratory manual. The taxonomic keys are easy to use, suitable for both classroom and laboratory identifications. Detailed line drawings are provided to help confirm the identification of the major species. Zoologists, limnologists, hydrobiologists, fish ecologists, and those who study or monitor water quality will welcome this dependable new identification tool. A concise summary of pertinent information on the ecology of these zooplankton is provided in the main body of the text. A check-list of all species reported from each of the Great Lakes and notes on the distribution and abundance of more than a hundred species were compiled from an extensive search of existing literature. In addition, the authors collected samples from several locations on Lake Superior, in order to provide information on the abundance and life histories of the major crustacean species.

Book Synchronous Recruitment of Walleye in the Great Lakes and the Influence of Climate on Recruitment

Download or read book Synchronous Recruitment of Walleye in the Great Lakes and the Influence of Climate on Recruitment written by Samantha Lee Fedor and published by . This book was released on 2008 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Current concerns about the repercussions of global climate change have stimulated efforts to understand how changing abiotic conditions influence natural populations. Walleye (Sander vitreus) populations have shown marked annual variability that can not be predicted by the size of the spawning population. Previous research has associated this variability with environmental factors such as spring warming rate, river discharge, and storm frequency and intensity. Frequently, however, the predictability of models developed from these studies falters as new data points are added and previous relationships are weakened. Relationships between recruitment and abiotic variables may disintegrate because of the interaction between local and large-scale variables that may not be detected in short time series but become more apparent when many more years are added. By comparing multiple populations within a region, the effects of large-scale variables and local variables should be possible to distinguish, with years of covariation representing years in which climate (or other large-scale factors) is influencing recruitment. We examined the effects of climate on recruitment of walleye by comparing four populations of walleye in the Great Lakes (west basin, Lake Erie, Saginaw Bay, Lake Huron, Green Bay, Lake Michigan, and Bay of Quinte, Lake Ontario) for synchrony of recruitment. Synchrony in recruitment among populations was determined using Pearson's product moment coefficient, and both single site and multi site models were created to test a set of a priori hypotheses regarding various local and large-scale factors influencing recruitment. Synchrony of recruitment occurred between three sites: west basin, Lake Erie, Green Bay, Lake Michigan, and Bay of Quinte, Lake Ontario during 2000-2004. El Niño-Southen Oscillation and the North Atlantic Oscillation were the best predictors of recruitment during 2000-2004. These results suggest that in addition to local weather conditions, large-scale factors influence walleye recruitment in the Great Lakes, and were the dominant variables influencing recruitment during this time. Understanding whether future changes in climate will cause overall increases or decreases in recruitment may help managers choose between more conservative and more liberal management strategies.

Book Movement Distribution and Habitat Use of a Riverine Walleye Sander Vitreus

Download or read book Movement Distribution and Habitat Use of a Riverine Walleye Sander Vitreus written by William Edward Chapman (II.) and published by . This book was released on 2005 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1995, Kentucky Department of Fish and Wildlife Resources (KDFWR) biologists discovered the presence of what was once thought to have been a lost native river run walleye (Sander vitreus). The native population was thought to have been extirpated due to dams and stocking of Lake Erie walleye (since 1973) into Lake Cumberland, but KDFWR and collaborating geneticists confirmed the strain persisted in the Rockcastle River. The purpose of this study was to determine how the natives remained reproductively isolated from the introduced Lake Erie strain. Radio telemetry was used to determine home range, seasonal movement patterns, and spawning locations, as well as habitat characteristics for these natives in the Rockcastle River. Efforts were made to implant transmitters in 40 native and 20 Lake Erie walleye, but genetic analysis of fin clips revealed that all walleye captured were native. Thus, data collected from fall 2003 to the end of spring 2005 were for 60 native individuals. Movements indicated upstream spawning from March through early April; and widely varying downstream post-spawning movements. Seasonally, high water discharges in February and March were cues for upstream movements to pool areas below spawning sites at shallow gravel riffles. Twenty-four hour monitoring revealed fish to be most active during the night with peak activity at sunrise and sunset. Movement patterns resembled that of other studies, with respect to spawning migrations, limited summer activity, and increased activity in the fall, late winter, and spring seasons. In total, approximately 370 walleye were captured during this study, and all but one small individual (collected in the lower Rockcastle River) were confirmed as natives through genetic analysis. Based on these collecting efforts, it is likely there is negligible interaction between native and Lake Erie walleye. In addition, the native walleye tend to migrate farther upstream to spawn, thus, further reducing the chances for hybridization between the two strains. In conclusion, this study will aid the KDFWR in their preservation efforts of the native walleye in the Rockcastle River by suggesting better places to stock and identifying key river sections as walleye spawning sites that should remain undisturbed.

Book Modeling Walleye Sander Vitreus Spawning Habitat Suitability and Reproductive Success in the Sandusky River Ohio USA

Download or read book Modeling Walleye Sander Vitreus Spawning Habitat Suitability and Reproductive Success in the Sandusky River Ohio USA written by Daniel Adam Gillenwater and published by . This book was released on 2005 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Dam removal is becoming an increasingly popular tool for river restoration throughout the United States. One of the most controversial dam removal proposals in the Lake Erie Watershed involves the Ballville Dam on the Sandusky River (Ohio). The Sandusky River is one of the major spawning tributaries for Lake Erie walleye (Sander vitreus). However, the dam located at river kilometer 29, blocks the fish from reaching upstream gravel beds and forces them to spawn below the Ballville Dam. It has been suggested that removing the dam will increase walleye reproductive success and thus the returning spawning population. This work is divided into two separate studies that focus on different aspects of the impacts the Ballville Dam has on the walleye population in the Sandusky River. An existing ecological model of walleye spawning and early life history stages in the Sandusky River is validated using in-situ egg deposition and larval drift data collected during the 2003 and 2004 spawning seasons. The results indicate that the model results agree with field observations for a spawning population of 2000 to 5000 females. However, this number of females is insufficient to saturate the below-dam spawning grounds, and therefore no increase in egg deposition or larval production is noted for without-dam simulations. A GIS-based habitat suitability model of an area of the currently available spawning grounds in the Sandusky River was also created and validated. The model was able to give a reasonable indication of habitat suitability dynamics in the current spawning grounds. However, there was difficulty resolving velocities in complex areas of the channel. The results indicate that floods with discharges exceeding 100 m3/s can reduce the area of suitable habitat to almost zero. Reproductive success in a given year may therefore rely heavily on the length of the spawning season and the discharge patterns. The results of the two models offer new insight into the removal of the Ballville Dam. However, coupling the two systems (an ecological model and a high resolution habitat suitability model) would give the most complete assessment of the potential impacts of the removal of the Ballville Dam on the walleye population in the Sandusky River.

Book The Relation Between Demographics and Genetic Integrity of Walleye Sander Vitreus Populations in Northern Wisconsin

Download or read book The Relation Between Demographics and Genetic Integrity of Walleye Sander Vitreus Populations in Northern Wisconsin written by Matthew D. Waterhouse and published by . This book was released on 2011 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Walleye Habitat Use Spawning Behavior and Egg Deposition in Sandusky Bay Lake Erie

Download or read book Walleye Habitat Use Spawning Behavior and Egg Deposition in Sandusky Bay Lake Erie written by Adam L. Thompson and published by . This book was released on 2009 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Understanding habitat selection in fish can reveal areas critical for a population's continuation in the ecosystem. In systems experiencing habitat alterations or reductions in population sizes, identifying habitat use takes on increased importance. To facilitate our understanding of potential factors limiting the success of walleye (Sander vitreus) in Sandusky Bay, Lake Erie, we combined walleye locations determined from radio telemetry with habitat predictor variables to model habitat use and reveal sex-specific patterns of habitat use throughout the spawning season (Chapter 2). Models revealed that the presence of preferred walleye spawning substrate, gravel and cobble, was an important predictor of walleye locations during the entire spawning season, and depth and distance from shore were important particularly prior to the spawn. In examining sex-specific patterns of habitat use, we discovered that males were more likely to occur over gravel and cobble substrates than females. We hypothesize that males establish position in these areas in anticipation of spawning females. Only a small proportion of walleye tagged in Sandusky Bay migrated to upstream spawning grounds (2 of 197; 1%). To confirm whether walleye spawning occurs in Sandusky Bay and to analyze how spawning substrate might affect egg deposition rates and viability, we compared eggs collected using spawning mats from gravel/cobble and sand/silt substrates (Chapter 3). Egg deposition and egg viability were not significantly different between substrates, and the majority of walleye eggs were collected from one site that contained gravel and cobble. The combined results of this investigation reveal that the Sandusky Bay is a spawning ground for walleye and that preferred spawning substrate is an important factor predicting the location of walleye during the spawn. Because the amount of spawning habitat in this system has declined by an estimated 92% during the past century, we recommend that conservation and restoration steps be taken to preserve this walleye spawning population.

Book Determining Spawning Occurrence and Reproductive Potential of Shenango River Lake Walleye

Download or read book Determining Spawning Occurrence and Reproductive Potential of Shenango River Lake Walleye written by Michael T. Hamilton and published by . This book was released on 2009 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this project was to achieve an assessment of walleye (Sander vitreus) spawning through the collection of eggs and physico-chemical data in the Shenango River, from the Shenango River Lake extending upstream approximately 24 river kilometers. It is generally thought that successful spawning of walleye in Pennsylvania is nearly non-existent, but the research to support this is limited. The data collected during sampling included river depth, flow velocity, water temperature, dissolved oxygen, pH, and river substrate content. This data will provide a baseline for future studies of the Shenango River and similar fisheries. This information was compared with that of other studies on walleye spawning habitat to establish a Walleye Spawning Qualitative Habitat Evaluation Index (WSQHEI). Walleye spawning attempts by Shenango River Lake walleye in the Shenango River was confirmed by this study. The WSQHEI appeared unsuitable for predicting walleye spawning in the Shenango River. Physico-chemical data displayed minimal gradients, which limited the development and effectiveness of the WSQHEI. This occurred because sampling was restricted to areas conducive to walleye spawning based upon literature of known environmental variables. Although walleye spawning activity was unrelated to environmental conditions among sites, migration distance was negatively correlated with walleye spawning activity. Sampling in 2008 and 2009 indicated that spawning occurrence decreased as distance from Shenango River Lake increased. The WSQHEI could be useful for baseline assessments when little or no data are available about the walleye spawning activities in a lotic system.