Download or read book Estimating Run Size of Anadromous Fishes in the Roanoke River North Carolina Using Hydroacoustics written by Warren Anderson Mitchell and published by . This book was released on 2006 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: sonar, split-beam, American shad, striped bass.

Download or read book Estimating Run Size of Anadromous Fishes in the Roanoke River North Carolina Using Hydroacoustics written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The annual arrival of American shad Alosa sapidissima, striped bass Morone saxatilis and hickory shad Alosa mediocris is ecologically and economically important in the rivers of North Carolina. Both species support commercial and recreational fisheries, and both are the focus of management efforts by state and federal agencies. Reliable information about population levels is essential for effective management. The goal of this study was to estimate the number of adult spawners returning to the Roanoke River. During April-May 2004 and March-May 2005, a stationary 430 kHz hydroacoustic system was deployed on the river bottom in a side-aspect orientation. Tracks of upstream-migrating fish were discernable from ambient noise. The number of fish migrating upstream was slightly lower during 00:00-08:00 compared to the other two 8-hr periods of the day. A majority of fish tracks were within 2 m of the river bottom in both years (89%), and were more associated with ranges near shore. Drift gill netting and boat electrofishing appear to provide an adequate measure of the seasonal presence and absence of target species, though electrofishing provides better samples size. These traditional fisheries methods confirmed the expected seasonal pulses of hickory shad, followed by striped bass, during both years. Counts of upstream fish tracks were low during periods between these pulses. Daytime electrofishing catch rates for 2005 were correlated with daily counts of upstream fish tracks. American shad occurred sporadically at low abundance throughout both years. It was the main target species in this study but made up less than 2% of the catch in both years. A majority of fish captured by gill netting (85%) were within two meters of the river bottom. Analysis methods were standardized in 2005 based on lessons learned in 2004. The 2004 species-specific estimates were 9,046 American shad and 126,176 striped bass. The default estimates (and SEs) for 2005, assuming a uniform cross-chan.

Download or read book Use of Split Beam Sonar to Estimate Anadromous Fish Runs in the Roanoke River North Carolina written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT MAGOWAN, KEVIN JAMES. Use of Split-beam Sonar to Estimate Anadromous Fish Runs in the Roanoke River, North Carolina. (Under the direction of Joseph E. Hightower.) Annual in-river population estimates of anadromous fishes in the Roanoke River would be useful for managing this resource. The goal for some species (American shad Alosa sapidissima, alewife Alosa pseudoharengus, and blueback herring Alosa aestivalis) is to monitor current restoration efforts. For other species (striped bass Morone saxatilis, hickory shad Alosa mediocris and white perch Morone americana), the goal is to manage sustainable commercial and recreational fisheries. Hydroacoustic methods are useful for estimating the abundance of anadromous fishes, because these methods are non-intrusive, have been proven to work in other river systems, and are capable of generating real-time population estimates. The goal of this project was to estimate the numbers of anadromous fishes returning to the Roanoke River in 2006 and 2007. We used fixed-location split-beam sonar in conjunction with drift gill netting and boat electrofishing to estimate run size of alewife, American shad, blueback herring, hickory shad, striped bass and white perch migrating upstream past a study site at river kilometer 64 near Williamston, North Carolina. The default estimates (and SEs) for 2006, assuming a uniform cross-channel distribution of upstream migrants and a fixed river depth cut-off point to separate fish migrating near the river bank (i.e., in water 3 m deep) from fish migrating in the river channel (i.e., in water 3 m deep), were: total run size 819,063 (Â" 31,234), alewife 60,622 (Â" 7,871), American shad 35,483 (Â" 4,936), blueback herring 88,281 (Â" 8,689), hickory shad 40,465 (Â" 6,155), striped bass 217,439 (Â" 14,236), white perch 83,035 (Â" 8,054), and other fish species 293,737 (Â" 13,356). In 2006, the estimates were generated for fish that migrated past the monitoring site from March 18 to May 29.

Download or read book Use of Split beam Sonar to Estimate Anadromous Fish Runs in the Roanoke River North Carolina written by Kevin James Magowan and published by . This book was released on 2008 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: Roanoke River, cartesian coordinates, range from shore, Williamston, North Carolina, Albemarle Sound, Split-beam, sonar, channel, electrofishing, fish passage, American shad, striped bass, white perch, DIDSON, run-size, population, fish, anadromous, target strength, drift gill netting, hickory shad, blueback herring, alewife, in-river population estimates, bank, hydroacoustic.

Download or read book Abundance and Migratory Patterns of Anadromous Fish Spawning Runs in the Roanoke River North Carolina written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Anadromous fishes often support significant commercial and recreational fisheries. Obtaining the information needed for their effective management can be problematic, however, because of the difficulties associated with sampling coastal rivers. Objectives of this research were to: (1) evaluate two novel methods for characterizing the spawning runs of anadromous fishes in southeastern coastal rivers, and (2) develop a method for estimating the total size of a spawning run. We operated a fishwheel on the Roanoke River, North Carolina during the spring seasons of 2000, 2001, and 2002, and conducted stationary, split-beam, side-looking hydroacoustic monitoring at the same site in 2001. The fishwheel captured 39 species over the three seasons, but fishwheel effectiveness appeared to vary among species and with changes in river conditions. The turning speed of the baskets was nearly always lower than what is considered optimal, suggesting that water velocities were too low for most effective operation. Daily fishwheel catches provided good information about the timing of migration for anadromous species that were captured in sufficient number, primarily striped bass and blueback herring. Catches of anadromous species varied substantially through each season, both due to the timing of migration and to changes in the fishwheel's effectiveness. Daily fishwheel catches provided information about the spawning runs at finer temporal scales than is typically possible, and the size distributions and annual catch rates of striped bass obtained by fishwheel sampling were similar to results from electrofishing. We developed a model for estimating run size using data from split-beam sidelooking hydroacoustic monitoring. The model is based on counts of upstream migrants and makes adjustments for: (1) the proportion of the day that was sampled (temporal sampling fraction), (2) the proportion of the river that was sampled (spatial sampling fraction), (3) the proportion of fish detected.

Download or read book Combining Count Data from Split beam and Multiple DIDSON Sonar Techniques to Estimate Spawning Run Abundance of Anadromous Fishes in the Roanoke River NC written by Jacob Brian Hughes and published by . This book was released on 2012 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Historical Distribution of Anadromous Fishes Within the Roanoke River Basin written by Robert M. Zarzecki and published by . This book was released on 1997 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Atlantic Salmon written by Eric Verspoor and published by John Wiley & Sons. This book was released on 2008-04-15 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atlantic Salmon is a cultural icon throughout its North Atlantic range; it is the focus of probably the World’s highest profile recreational fishery and is the basis for one of the World’s largest aquaculture industries. Despite this, many wild stocks of salmon are in decline and underpinning this is a dearth of information on the nature and extent of population structuring and adaptive population differentiation, and its implications for species conservation. This important new book will go a long way to rectify this situation by providing a thorough review of the genetics of Atlantic salmon. Sponsored by the European Union and the Atlantic Salmon Trust, this book comprises the work of an international team of scientists, carefully integrated and edited to provide a landmark book of vital interest to all those working with Atlantic salmon.

Download or read book The Future of Fisheries Science in North America written by Richard J. Beamish and published by Springer Science & Business Media. This book was released on 2009-02-07 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fisheries science in North America is changing in response to a changing climate, new technologies, an ecosystem approach to management and new thinking about the processes affecting stock and recruitment. Authors of the 34 chapters review the science in their particular fields and use their experience to develop informed opinions about the future. Everyone associated with fish, fisheries and fisheries management will find material that will stimulate their thinking about the future. Readers will be impressed with the potential for new discoveries, but disturbed by how much needs to be done in fisheries science if we are to sustain North American fisheries in our changing climate. Officials that manage or fund fisheries science will appreciate the urgency for the new information needed for the stewardship of fish populations and their ecosystems. Research organizations may want to keep some extra copies for a future look back into the thoughts of a wide range of fisheries professionals. Fisheries science has been full of surprises with some of the surprises having major economic impacts. It is important to minimize these impacts as the demand for seafood increases and the complexities of fisheries management increase.

Download or read book Alewife and Blueback Herring written by Earl L. Bozeman and published by . This book was released on 1989 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Handbook of Sidescan Sonar written by Philippe Blondel and published by Springer Science & Business Media. This book was released on 2010-05-17 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sidescan sonar is proving to be the preeminent technique for researchers and professionals seeking knowledge about the structure and behavior of the seafloor, but its data is often difficult to interpret due to the physics of acoustic remote sensing, and to the varied geological processes at play. This book covers the fundamentals of sidescan sonar, incorporates new understanding of marine structures, and explains how to interpret sidescan sonar imagery and bathymetry.

Download or read book Migration of Freshwater Fishes written by Martyn Lucas and published by John Wiley & Sons. This book was released on 2008-04-15 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent studies have increasingly demonstrated the widespread existence of spatio-temporal variations in the abundance and distribution of species of freshwater fishes, previously assumed not to move between habitats. These movements are often on a seasonal or ontogenetic basis, for spawning, feeding and refuge, and in many cases are fundamental for the successful completion of lifecycles. This important book provides a single source for a range of previously widely dispersed information on these movements of fish in fresh waters, covering potamodromous fishes as well as the more familiar diadromous species, worldwide. Contents include full descriptions of types of migration and spatial behaviour, the stimulus and capacity for fish to migrate, the effects of climate on patterns of migratory behaviour, a taxonomic analysis (mostly by family) of freshwater fish migration, methods for studying migration, and details of the impacts of man's activities on freshwater fish migration. Migration of Freshwater Fishes provides an excellent and comprehensive reference to which the river manager, biologist or student can now refer to obtain information, advice and current opinion on the migratory behaviour of most taxonomic groups of fishes occurring in fresh water. University libraries and aquatic research stations should also have copies of this essential reference book on their shelves. Well-known international authors. Of great commercial importance to fisheries and professional angling bodies. Draws together much new information in one place. Detailed review of world wide migratory behaviour for most groups of freshwater fishes. Pure and applied relevance, for academics, fisheries scientists, river managers and conservationists. This comprehensive book includes 67 tables and figures and over 1,400 references.

Download or read book Habitat Suitability Index Models and Instream Flow Suitability Curves written by Richard L. Schroeder and published by . This book was released on 1985 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Chesapeake Delaware Canal written by and published by . This book was released on 1974 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Identification of Larval Fishes of the Great Lakes Basin with Emphasis on the Lake Michigan Drainage written by Great Lakes Fishery Commission and published by . This book was released on 1982 with total page 788 pages. Available in PDF, EPUB and Kindle. Book excerpt: This manual for the identification of larval fishes of the Great Lakes basin with emphasis on the Lake Michigan drainage treats 24 families and 148 species. In addition to a key to the families, keys were constructed for selected species within some families. Species accounts include descriptions of adult ecology, reproductive biology, diagnostic characters and meristics. A description of the egg is given, as are morphometric, morphological and pigmentation characteristics of yolk-sac larvae, larvae and juveniles. Illustrations of yolk-sac larvae, larvae and juveniles have been included wherever possible and informative.

Download or read book A Guide to Integrated Fish Health Management in the Great Lakes Basin written by Great Lakes Fishery Commission and published by . This book was released on 1983 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Red cockaded Woodpecker written by and published by . This book was released on 1995 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt: