Download or read book An Analysis of the Current Method for Ageing American Shad Alosa Sapidissima with a New Validated Method Using Otoliths written by William Duffy and published by . This book was released on 2010 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Validation and Use of Sagittal Otoliths for Aging of Larval American Shad Alosa Sapidissima written by Thomas Francis Savoy and published by . This book was released on 1985 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Marine Fisheries Review written by and published by . This book was released on 1987 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Comparison of Common Age Determination Methods for American Shad Alosa Sapidissima from the Connecticut River written by Frank Beres and published by . This book was released on 2018 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: American shad (Alosa sapidissima) populations along the Atlantic coast and in the Connecticut River are prone to fluctuations but have mostly been in decline for decades. Reliable and practical methods for determining population age structure are vital to management decisions that ensure geographically distinct populations remain viable. Results from scale-based and otolith-based aging methods determined by a single reader were assessed via: (1) percent agreement and (2) coefficients of variation to assess precision between ages derived from otolith and scales for each individual fish, and (3) Bowker’s test of symmetry and (4) age-bias plot to determine if conflicting aging results were by chance or due to inherent differences in the structures. Structures examined were found to have a low agreement and coefficients of variation, suggesting systematic differences in ages derived from the two structures. Results from Bowker’s test of symmetry and the age-bias plot both show reader bias in aging results as age estimates increase.

Download or read book Age and Growth of Age 0 American Shad Alosa Sapidissima in Four Virginia River Habitats Based on Otolith Microstructure Analysis written by Kevin Mark Gooss and published by . This book was released on 2001 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comparing the Hickory Shad Alosa Mediocris and American Shad Alosa Sapidissima Sport Fishery Using Age and Spawning Composition and Social Media written by Samantha Ann Dowiarz and published by . This book was released on 2021 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this study was to compare aspects of Hickory Shad (Alosa mediocris) (Mitchell 1814) and American Shad (Alosa sapidissima) (Wilson 1811) life history while also providing supplemental information on their age and spawning composition, recreational catch and effort, and geographical distribution for future stock assessments. Hickory and American shads are anadromous fish species native to the East Coast of North America that ascend freshwater watersheds to spawn in the spring. Exactly how similar these two species are in life history is unknown, but the two species are co-managed federally by the Atlantic States Marine Fisheries Commission. Based on the 2020 stock assessment, American Shad are in a state of decline in multiple watershed along the spawning range, but it is unknown whether Hickory Shad are experiencing the same decline because the lack of scientific literature makes a benchmark coastwide stock assessment impossible to complete. The first objective of this study was to compare the age and spawning composition of Hickory Shad captured from different river systems along their range. Since aging protocols for Hickory Shad scales and sagittal otoliths were never published in the primary literature, the Massachusetts Division of Marine Fisheries American Shad Ageing Protocol was used in its place. A subsample of transversely sectioned otoliths were aged, coupled with otolith microchemistry, and compared to whole otolith ages. The results determined that Hickory Shad otoliths should be aged slightly differently than American Shad, an aspect of their life history that disagrees with their current co-management. Otoliths were the more precise aging structure, so a sex-specific age-length key for North Carolina was created from 240 Hickory Shad otoliths aged from the Rulifson Lab. The keys were then used to assign ages to length data provided by the North Carolina Wildlife Resources Commission (NCWRC) and North Carolina Division of Marine Fisheries (NCDMF) to create a length-at-age distribution. Fish used in this study were primarily grab samples from agency spring monitoring and so results may not accurately extrapolate to the entire spawning population; however, with the exception of Georgia the results here suggest a latitudinal repeat spawning gradient of increased iteroparity from south to north, a trend also observed for the American Shad. Both species comprise important recreational fisheries throughout their ranges, so much so that a Facebook group named "NC-Shad" was created in 2013 for anglers to post about their fishing trips, successful or otherwise. From 2013-2020, a total of 1,790 posts were analyzed to determine angler demographics, lure characteristics, and catch information. From all posts, 1,398 included location information, so Geographic Information Systems (GIS) was employed to examine spatiotemporal patterns in fishing location and Hickory Shad and American Shad Catch Per Post (CPP). Catch Per Post was used in place of Catch Per Unit Effort (CPUE) because not every post indicated the number of anglers present, so effort could not be assessed based on this data collection method. Although significant spatiotemporal trends were not found based on both Hickory and American shad CPP, an overall positive trend in Hickory Shad CPP and negative trend in American Shad CPP is apparent throughout the study period. These opposing CPP trends suggests that something, whether it is anthropogenic or naturally occurring, is affecting American Shad more drastically than Hickory Shad. The "NC-Shad" CPP was also compared to the CSMA anadromous creel survey CPP obtained annually by the NCWRC, and multiple years within multiple watersheds were found to have significant differences in CPP for both Hickory and American shads. One caveat in this comparison is that creel surveys do not collect information from bank anglers, but many posts from "NC-Shad" were from bank anglers, which may explain some of the CPP differences. This study demonstrated that social media is a technological adaption with potential to form a recreational angler citizen science network based on Local Ecological Knowledge (LEK). Social media data mining could be a cost-effective alternative to obtain supplementary information on recreationally important fish species, and viable technique for the future of fisheries management.

Download or read book Use of Otoliths for Stock Differentiation of American Shad Alosa Sapidissima Wilson written by Philip James Williams and published by . This book was released on 1985 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Canadian Special Publication of Fisheries and Aquatic Sciences written by and published by . This book was released on 1992 with total page 140 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 Migratory Patterns of American Shad Alosa Sapidissima Revealed by Natural Geochemical Tags in Otoliths written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Support was given by National Science Foundation grants to Dr. Thorrold (OCE-0215905 and OCE-0134998). I received additional support from the Woods Hole Oceanographic Institution (WHOI) Academic Programs Office, the American Museum of Natural History Lerner-Gray Fund for Marine Research, a SEASPACE, Inc. Research Scholarship, and a WHOI Ocean Life Institute Research Grant.

Download or read book Ova Production of American Shad in Atlantic Coast Rivers written by William S. Davis and published by . This book was released on 1957 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The number of ova produced by American shad (Alosa sapidissima) based on samples of five fish from each of six Atlantic coast rivers was found to range from 209,000 to 616,000 ova per year. Hudson River shad produced fewer ova by size and St. Johns River shad produced more ova by size than did shad from the other four rivers. Statistical evidence is presented to show that the six ovarian samples per fish used to estimate total ova production can be reduced without imparing the accuracy of the total ova production estimate.

Download or read book Otolith Microstructure Examination and Analysis written by David K. Stevenson and published by McClain Printing Company. This book was released on 1992 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of otolith microstructure research has experienced phenomenal growth since the early 1970s and now forms the basis for hundreds of studies in early life history, age, growth, recruitment, migration, mortality and stock structure. This book represents the first effort to compile and summarize the many techniques and procedures associated with studies of otolith microstructure. The complete sequence of events, from sample collection to data analysis, is covered comprehensively, so as to be applicable to most species and situations. The various chapters include both published and unpublished procedures.

Download or read book Ecological Constraints on Growth and Migration of Juvenile American Shad Alosa Sapidissima Wilson in the Hudson River Estuary New York written by Karin E. Limburg and published by . This book was released on 1994 with total page 750 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Spawning Patterns and Larval Growth and Mortality of American Shad Alosa Sapidissima in the St Johns River FL written by Jason Michael Boucher and published by . This book was released on 2009 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Review of the Current Status of the American Shad Alosa Sapidissima in the Susquehanna River written by Bruce D. Sidell and published by . This book was released on 1979 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Age and Growth of the American Shad Alosa Sapidissima in Yuba River 1969 written by Joan Rae Sanford and published by . This book was released on 1975 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Biochemical and Genetic Analysis of American Shad Alosa Sapidissima Migrating Into Chesapeake Bay written by Edward Norbert Sismour and published by . This book was released on 1985 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: