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 Life History Aspects of the Hickory Shad Alosa Mediocris in the Albemarle Sound Roanoke River Watershed North Carolina written by Christopher F. Batsavage and published by . This book was released on 1997 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Status of the American Shad Alosa Sapidissima Wilson in North Carolina written by Sara E. Winslow and published by . This book was released on 1990 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Shad written by Douglas E. Facey and published by . This book was released on 1986 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Age and Spawning History of American Shad Alosa Sapidissima in Central California 1975 1978 written by Lynn H. Wixom and published by . This book was released on 1981 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Age and Growth of Spawning Hickory Shad Alosa Mediocris in Octoraro Creek Maryland with Comments on the Present Decline in Population Numbers written by John Edward Schaeffer and published by . This book was released on 1976 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Species Profiles written by Lori S. Weiss-Glanz and published by . This book was released on 1986 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 72 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 Fecundity of Hudson River Shad written by Burton A. Lehman and published by . This book was released on 1953 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Obviously, the number of eggs that could be taken by spawn-takers for hatchery purposes at any one time has generally been accepted as the total number of eggs a shad could be produced in a season. Since only a part of the eggs are ripe and ready for spawning at one time, these earlier records represent but a fraction of the number of ova actually produced during a spawning season.
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 Species Profiles written by Douglas E. Facey and published by . This book was released on 1986 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Alosines written by and published by . This book was released on 2005 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: The South Carolina Department of Natural Resources published guides to many threatened animals living in the state. This guide gives information about alosines, including description, status, habitat, conservation challenges & recommendations, and measures of success.
Download or read book Selected Life History Aspects of American Shad Alosa Sapidissima and Predation on Young of the year Shad in Lake Umatilla of the Columbia River written by Cris Eric Stainbrook and published by . This book was released on 1982 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: Selected life history aspects of American shad, Alosa sapidissima, collected in Lake Umatilla of the Columbia River during 1980 and 1981 were examined and compared to other shad populations. Mean fork lengths of adult shad captured in 1981 were 405-, 415- and 423-mm for age III, IV and V males; 425-, 444- and 457-mm for age III, IV and V females. The mean age at maturity was determined to be 3.2 years for males and 3.5 years for females while the rate of repeat spawning was 36% and 45% for males and females, respectively. Four-year-old shad accounted for 58.5% of the spawning adults in the two years. Absolute fecundity ranged from 97,168 to 284,240 eggs with a mean of 193,074 eggs per female. Young-of-the-year shad were more abundant in 1980 than in 1981. In both years, the tail-race zone was the most important spawning area and the island zone the most important rearing area for young-of-the-year shad in the reservoir. Growth of young shad in Lake Umatilla was similar in all sampled macrohabitats and appears to be dependent on year class strength, water temperature and water flow. Out-migrating young-of-the-yetar shad passing through John Day Dam were significantly largjer than young-of-the-year shad in reservoir habitats indicating size, as well as temperature, influences the timing of downstream migration. Predation on young shad by resident predator fish species was variable and appeared to be dependent on the Abundance of young-of-the-year shad.
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 Species Profiles written by Lori S. Weiss-Glanz and published by . This book was released on 1986 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Migration and Spawning of Anadromous Shads in the Roanoke River North Carolina written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Anadromous alosines are ecologically, commercially, and recreationally valuable fishes. Some populations of alosines are at historically low levels, as a result of overfishing, pollution and habitat change, including the presence of dams, which block access to historic spawning sites upstream and alter spawning habitat downstream. To aid in the restoration of alosine stocks, I evaluated several methods for spawning habitat identification and characterization and evaluated trap and transport as a method to give American shad Alosa sapidissima access to additional spawning habitat above dams in the Roanoke River, North Carolina and Virginia. The Roanoke River has four anadromous shads: American shad, hickory shad A. mediocris, blueback herring A. aestivalis, and alewife A. pseudoharengus. For all four alosines, spawning sites river-wide were most efficiently identified using plankton tows. Spawning habitat selection for hickory shad and river herring (blueback herring and alewife) could be evaluated using spawning pads, whereas American shad eggs were unsuccessfully sampled by spawning pads and spawning habitats were best examined by visual observations of spawning splashes. Unlike the other alosines in this study, very little is known about spawning habitat for hickory shad. Hickory shad eggs were collected at water temperatures from 10 to 23 Ã'ÂðC, and peaked from 11 to 14 Ã'ÂðC. Spawning generally occurred in water velocities Ã؉ÂÆ0.1 m/sec, over substrates free from silt. Standard USFWS and Bayesian belief network formats were used to develop preliminary habitat suitability models for hickory shad. Bayesian belief networks are a relatively new method for modeling habitat suitability for fishes, but could prove very useful in the future, especially for species such as American shad which have been the focus of more study and are in need of restoration. We evaluated movement patterns and spawning of sonic-tagged adult American shad transported to habitats above da.
