Download or read book Migratory Behavior of American Shad in the York River Virginia with Implications for Estimating In river Exploitation from Tag Recovery Data written by and published by . This book was released on 2006 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Migratory and Spawning Behavior of American Shad in the James River Virginia written by Aaron W. Aunins and published by . This book was released on 2006 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Shad Fishery of Chesapeake Bay with Special Emphasis on the Fishery of Virginia written by Charles H. Walburg and published by . This book was released on 1957 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of the American shad (Alosa sapidissima) in Chesapeake Bay was made in 1952. Catch and effort records were combined with data obtained from tagging studies conducted at the entrance to Chesapeake Bay, in the James and Potomac Rivers, and at Cove Point (Maryland) to obtain population parameters for these areas. These studies were successful except for the results of tagging at the mouth of the Bay, which data could not be used because of a disproportionate tag recovery-catch ratio between the various areas of Chesapeake Bay. Total population and escapement were determined for each year in which data were available. It is recommended that the States of Maryland and Virginia establish comparable systems for the collection of catch-and-effort records on the shad so that these basic data will be available for any future study of the Chesapeake Bay fisheries.
Download or read book Abundance and Exploitation Rate of American Shad in the York River System written by John M. Hoenig and published by . This book was released on 2000 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 2010 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimating Population Parameters of American Shad in the York River Virginia written by Kristin Lynn Maki and published by . This book was released on 2002 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Migratory Patterns of American Shad Alosa Sapidissima Revealed by Natural Geochemical Tags in Otoliths written by Benjamin Dwaine Walther and published by . This book was released on 2007 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) Only 6% of spawners originated from rivers other than the York, supporting the hypothesis that most American shad spawn in their natal river. Of remaining spawners, 79% originated from the Mattaponi River and 21% from the Pamunkey River. The results suggested that while most American shad home to their natal river there is less fidelity to individual tributaries, allowing subsidies to subpopulations with persistent recruitment failure. Otolith signatures were also used in mixed-stock analyses of immature migrants along the coast of Maine in the spring and Minas Basin in the summer. Mixed-stock compositions showed remarkably low diversity and were dominated by fish from the Shubenacadie and Hudson rivers, with an increasing proportion of Potomac River fish over time. In contrast to results from adult tagging studies, southern stocks were virtually absent. These data suggest ontogenetic shifts in migratory behavior. The thesis concludes with a report that water contributed 83% of Sr and 98% of Ba in the otoliths of a marine fish.
Download or read book Maturation and Repeat Spawning by American Shad in the York River Virginia written by Kristin Lynn Maki and published by . This book was released on 2000 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monitoring the Abundance of American Shad and River Herring in Virginia s Rivers written by Eric James Hilton and published by . This book was released on 2018 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the results of the twentieth year of a continuing study to estimate the relative abundance and assess the status of American shad (Alosa sapidissima) stocks in Virginia by monitoring the spawning runs in the James, York and Rappahannock rivers in spring 2017, evaluating hatchery programs, and contributing to coast-wide assessments (ASMFC 2007). We also report on two fishery-independent monitoring programs, one using staked gillnets in the Rappahannock River (year 2) and the other using anchor gillnets in the Chickahominy River (year 3; a major tributary of the James River),to determine relative abundance and stock structure for the adult spawning run of river herring (A. pseudoharengus, and A. aestivalis Further, we report on the third year of a monitoring program for juvenile alosines by using nighttime surface trawls in the Chickahominy River and calculate an index of juvenile abundance. Additional objectives were to monitor bycatch of American shad in a permitted gill-net fishery and American shad and river herring in pound-net fisheries.
Download or read book Suitability of the Susquehanna River for Restoration of Shad written by and published by . This book was released on 1968 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monitoring the Abundance of American Shad and River Herring in Virginia s Rivers written by and published by . This book was released on 2019 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Shad in the Susquehanna River Basin A Three Hundred Year History written by Richard Gerstell and published by Penn State Press. This book was released on 1998 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Natal river to Estuary Migration of American Shad written by John Edward Olney and published by . This book was released on 2005 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tagging Summary of American Shad Alosa Sapidissima Wilson and Striped Bass Roccus Saxatilis Walbaum Bureau of Commercial Fisheries Biological Laboratory Beaufort N C 1950 65 written by Paul Ruffner Nichols and published by . This book was released on 1966 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biology and Management of River Herring and Shad in Virginia written by Walter J. Hoagman and published by . This book was released on 1975 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: The number of pound nets and the catch of· alosines per net continued to decline in 1975. Effort by stake gill nets increased but catch estimates declined. The James River yielded an estimated 853,847 pounds of American shad (down 47% from 1974) with the peak of the run at the end of March. Stake gill nets landed 246,036. pounds of American shad in the York River, a decrease from 1974. Estimates of Hickory shad landings declined 83% in the York River. Pound nets in the Rappahannock River had a 75% reduction in American shad catch and stake gill net catch was down 13% from 1974. River herring catch estimates were down 13% in the Rappahannock River. Pound net catches of American shad declined 47% while landings from stake gill nets increased by 44% from 1974 in the Potomac River. River herring landings increased 34% in the Potomac River.
Download or read book Completion Report Delaware River Basin Anadromous Fishery Program written by Larry Lofton and published by . This book was released on 1979 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 1978 Adult American Shad Population Estimate is a continuation of an ongoing study to determine the magnitudes of shad stocks in the Delaware River. The population estimate was achieved through a tag and return procedure. Sub-objectives include 1) further development of the logbook creel survey of the Delaware River Shad Fishermen as a viable tool for shad recovery data, 2) determine the significance of hydrological and physical factors on the size of haul seine catches, 3) determine the percentage of repeat spawners in the spawning migration, 4) plot age, length and weight relationships of the shad, 5) plot the age structure of the spawning run and 6) map the distributional patterns of recaptured tagged shad.
Download or read book Genetic Evaluation of American Shad Alosa Sapidissima Restoration Success in James River Virginia written by Aaron Aunins and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The American shad Alosa sapidissima has experienced severe declines throughout its native range due to habitat degradation, fragmentation, and over-fishing. Hatchery supplementation is often used for stock restoration, but the effects of supplementation on population structure and genetic diversity are rarely assessed. This study employed molecular markers to evaluate how supplementation of the James River American shad population with Pamunkey River origin larvae since 1994 has impacted genetic diversity and population structure. Population genetic parameters of other major Chesapeake Bay tributaries (Susquehanna, Rappahannock, Potomac, and Nanticoke) also were characterized. Prior to stocking, the James and Pamunkey populations exhibited subtle genetic differentiation, which was absent among post-supplementation samples, presumably due to the stockings. A similar situation was observed among other shad populations of Chesapeake Bay tributaries which were subtly differentiated in the 1990s but lacked any credible among-population differentiation among contemporary samples. Genetic diversity of the James River shad population was high prior to stocking, and remained high throughout years of intensive supplementation, yet the current population decline suggests that the James River shad population still has not recovered. Despite harvest curtailment, elimination of the ocean intercept fishery, and widespread supplementation efforts, Chesapeake Bay tributary American shad populations are collectively at their lowest levels in recorded history. Therefore, success of other restoration goals such as creation of fish passage in James River was investigated in a concurrent radio telemetry study to assess passage at Bosher's Dam fishway. Ninety-four American shad were radio-tagged on the spawning grounds below Bosher's Dam. Approximately one-half of the tagged shad were detected at the escapement receiver within 24 hours after tagging, and the average residence times of remaining shad were approximately one week. No tagged shad were detected above Bosher's Dam. These results imply that restricted passage through Bosher's Dam fishway may be an important factor in the failure of James River American shad to recover. Therefore, improving passage at migratory barriers such as Bosher's Dam, in conjunction with a continued Bay-wide fishing moratorium, may be more beneficial to shad restoration efforts in James and other Chesapeake Bay tributaries than continued supplementation.
