{"title":"Introduction to Quantitative Ecology. Timothy E.Essington. Oxford University Press, Oxford, UK. 2021. 304 pages. $97.00 (hardcover), $48.99 (paperback), $17.27 (ebook).","authors":"J. Wilson White","doi":"10.1002/tafs.10440","DOIUrl":"https://doi.org/10.1002/tafs.10440","url":null,"abstract":"Transactions of the American Fisheries SocietyEarly View BOOK REVIEW Introduction to Quantitative Ecology. Timothy E. Essington. Oxford University Press, Oxford, UK. 2021. 304 pages. $97.00 (hardcover), $48.99 (paperback), $17.27 (ebook). J. Wilson White, Corresponding Author J. Wilson White [email protected] Coastal Oregon Marine Experiment Station and Department of Fisheries, Wildlife, and Conservation Sciences, Oregon State University, Newport, Oregon, USASearch for more papers by this author J. Wilson White, Corresponding Author J. Wilson White [email protected] Coastal Oregon Marine Experiment Station and Department of Fisheries, Wildlife, and Conservation Sciences, Oregon State University, Newport, Oregon, USASearch for more papers by this author First published: 13 October 2023 https://doi.org/10.1002/tafs.10440Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Early ViewOnline Version of Record before inclusion in an issue RelatedInformation","PeriodicalId":23214,"journal":{"name":"Transactions of The American Fisheries Society","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135858500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Estimating the genetic diversity and potential influence of habitat segregation in Channel Catfish","authors":"Francesco H. Janzen, Gabriel Blouin‐Demers","doi":"10.1002/tafs.10433","DOIUrl":"https://doi.org/10.1002/tafs.10433","url":null,"abstract":"Abstract Objective Individual habitat preference can reduce intraspecific competition for resources and may differ between age groups, sexes, and adult phenotypes. The Channel Catfish Ictalurus punctatus is a widespread species occurring in diverse freshwater habitats. This species displays breeding philopatry, returning to nesting sites occupied in previous years. Larger Channel Catfish tend to nest in the main channels of large rivers, whereas smaller fish tend to prefer smaller tributaries. The purpose of our study was to determine whether this habitat segregation potentially associated with habitat preference affects the genetic structure of a population. We hypothesized that spatial segregation of breeding sites in the Ottawa River and its smaller tributaries at Lac des Chats reduced gene flow within the population, resulting in genetically differentiated demes associated with lacustrine‐like and fluvial habitats. Methods Microsatellite allelic data was collected from 162 Channel Catfish. Result We found little genetic variation between the Ottawa, Mississippi, and Madawaska rivers. Furthermore, our analyses suggested that the sampled specimens comprised one panmictic population. Fish from one site in the Ottawa River, however, were significantly differentiated from fish from a nearby site also in the Ottawa River as well as from fish from the Mississippi River tributary. Conclusion Given that fish from sites further up the Ottawa River were not differentiated from fish from these sites, it is unlikely that geography can account for the differences observed; rather, assortative mating may explain the differentiation. We propose that panmixia within the population is caused by ontogenetic changes in habitat selection, straying individuals, or sex‐biased dispersal and philopatry.","PeriodicalId":23214,"journal":{"name":"Transactions of The American Fisheries Society","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135458446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Melanie E. F. LaCava, Isoline M. Donohue, Mary E. Badger, Tien‐Chieh Hung, Luke Ellison, Md Moshiur Rahman, Kerry Kelvas, Amanda J. Finger, Evan W. Carson
{"title":"Assessing captive spawning strategies for supplementation production of Delta Smelt (<i>Hypomesus transpacificus</i>)","authors":"Melanie E. F. LaCava, Isoline M. Donohue, Mary E. Badger, Tien‐Chieh Hung, Luke Ellison, Md Moshiur Rahman, Kerry Kelvas, Amanda J. Finger, Evan W. Carson","doi":"10.1002/tafs.10450","DOIUrl":"https://doi.org/10.1002/tafs.10450","url":null,"abstract":"Abstract To support the declining wild population of Delta Smelt, a conservation hatchery has expanded its mission from maintaining a backup population as insurance against extinction to also producing fish for release into the wild. The substantially higher production demands require a balance between producing large numbers of fish while adhering to conservation genetic principles that maximize retention of effective population size ( N e ) and thus overall diversity. We performed spawning experiments at the hatchery to evaluate the genetic consequences of two spawning strategies: 1) a pooled strategy where we fertilized premixed eggs from three dams with premixed milt from three sires and 2) a partial‐factorial strategy where eggs from three dams were mixed and then apportioned among three containers; each container then received milt from one sire. We used genetic parentage analysis of larval offspring to determine the reproductive success of spawners in ten replicate crosses of each strategy. Contributions of parents to offspring were more even in partial‐factorial crosses and consequently resulted in higher N e (average N e = 5.50 ± 0.38; expected N e = 6.0), suggesting its potential for maintaining genetic diversity over time. In contrast, our pooled spawning experiment produced lower and more variable N e values (average N e = 3.86 ± 1.30), demonstrating that this more efficient method of production entails high costs in terms of long‐term genetic management. Treating our experiments as hypothetical pools of fish for release, we combined N e values for pooled or partial‐factorial crosses to calculate the effective size of a release population ( N eR ). Unequal family sizes reduced the N eR for our pooled experiment to half of the expected value, whereas the partial‐factorial experiment N eR was 88% of the expected value. We discuss the benefits and risks of each method and how these can be considered when designing a spawning strategy for Delta Smelt supplementation.","PeriodicalId":23214,"journal":{"name":"Transactions of The American Fisheries Society","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135345048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Paige W. Breault, Mike Wetklo, Arne R. Langston, Randy J. Zemlak, Ruth E. Withler, J. Mark Shrimpton
{"title":"Genetic population structure of introduced and native lineages of <i>Oncorhynchus nerka</i> in a large impounded watershed","authors":"Paige W. Breault, Mike Wetklo, Arne R. Langston, Randy J. Zemlak, Ruth E. Withler, J. Mark Shrimpton","doi":"10.1002/tafs.10448","DOIUrl":"https://doi.org/10.1002/tafs.10448","url":null,"abstract":"Abstract Kokanee, the non‐anadromous life‐history form of Oncorhynchus nerka , use lacustrine habitat in watersheds draining into the north Pacific Ocean. Kokanee also have been widely introduced into reservoirs following impoundment of rivers consequent to the construction of hydroelectric dams. Genetically divergent subpopulations of Kokanee should be identified and evaluated when implementing watershed‐level fishery management strategies. We analyzed the genetic population structure of Kokanee in the Williston watershed, north‐central British Columbia, where native populations were present in the reservoir and headwater lakes prior to stocking Columbia River‐origin fish in the 1990s. Using microsatellite markers, we determined that native Williston Reservoir Kokanee were divergent from only one of the headwater lake populations. Native populations in headwater lakes remain entirely separate from the reservoir populations, and there was no indication of past or current introgression with the introduced stock. We identified all fish collected from 2006 to 2019 as introduced Columbia River‐origin genotypes, and there was no evidence of genetic divergence by spawning location. As native Williston Kokanee have not been sampled from the reservoir in survey efforts since 2000, it is likely that this population has been extirpated from the reservoir perhaps through competition with the introduced Columbia River‐origin lineage.","PeriodicalId":23214,"journal":{"name":"Transactions of The American Fisheries Society","volume":"340 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136153839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Byron D. Thomas, Dennis R. DeVries, Russell A. Wright, Matthew J. Catalano
{"title":"Movement of Paddlefish Once Past a <scp>Lock‐and‐Dam</scp> Structure on the Alabama River","authors":"Byron D. Thomas, Dennis R. DeVries, Russell A. Wright, Matthew J. Catalano","doi":"10.1002/tafs.10447","DOIUrl":"https://doi.org/10.1002/tafs.10447","url":null,"abstract":"Abstract Movement of fish past dams can be facilitated by dedicated fish passage structures, navigational locks, and crested spillways, with the efficacy of a passage structure depending strongly on the nature of the systems (height of the dam, flow rate, etc.) and the fish's behavior and swimming capability. However, once past a dam whether by the use of a mitigation structure or due to active translocation, fish encounter a different habitat upstream versus in the tailrace, potentially affecting their ability to continue their upstream migration. Here we had two objectives: First, we determined whether Paddlefish Polyodon spathula that successfully passed a structure continued on their upstream migration. Because assuring passage by tagged fish required that we move fish past the dam, our second objective was to determine whether translocated fish exhibited fallback behavior (downstream drift or movement post‐release that would compromise their continued migration). We used both active and passive telemetry to quantify post‐passage movements of tagged and translocated Paddlefish. Fish translocated above Claiborne Lock and Dam (CLD) exhibited up‐river movements once translocated and exhibited no fallback (i.e., downstream movement with delayed or no continuation upstream). Timing of movement relative to spawning periods did not influence initial fish movement or the likelihood of reaching the next upstream dam (Millers Ferry Lock and Dam; MFLD, approx. 100 river km upstream) within the first 30‐days of observation, but more fish tagged and released during the early pre‐spawning period made it within 4.83 km of MFLD (the location of our closest receiver below MFLD) than did fish from pre‐spawning or spawning periods. Fish released above CLD had a lower probability of being subsequently detected downstream of their release sites compared to fish released below CLD. Our findings support that Paddlefish will continue their upstream migration once past a structure despite changes in habitat.","PeriodicalId":23214,"journal":{"name":"Transactions of The American Fisheries Society","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135306509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Christian T. Smith, Racheal Headley, Matt Smith, Ben Kennedy, John Holmes, Melissa Nehmens, Brice Adams, Matthew Piteo, Jennifer Von Bargen
{"title":"Demographic and genetic consequences of a Steelhead supplementation program","authors":"Christian T. Smith, Racheal Headley, Matt Smith, Ben Kennedy, John Holmes, Melissa Nehmens, Brice Adams, Matthew Piteo, Jennifer Von Bargen","doi":"10.1002/tafs.10446","DOIUrl":"https://doi.org/10.1002/tafs.10446","url":null,"abstract":"Abstract Supplementation of naturally‐spawning populations by the addition of hatchery‐spawned individuals is commonly conducted for recovery of threatened and endangered populations and to support harvest opportunities. We present an analysis of steelhead, the anadromous form of Rainbow Trout ( Oncorhynchus mykiss ), returning to an integrated supplemented population in Southwest Washington over the course of 15 years. The goal of the supplementation program was to evaluate whether use of a juvenile captive broodstock and an integrated paradigm could be used to increase adult returns, while avoiding negative genetic impacts to the population. Estimates of relative reproductive success (RRS) for fish spawned in the hatchery ranged from 2.4 for hatchery‐origin females to 6.4 for natural‐origin males, indicating that fish spawned in the hatchery produced more returning adult progeny than did fish allowed to spawn in the natural environment. We observed a slight reduction in reproductive success (RS) for hatchery‐origin (relative to natural‐origin) fish when spawning in the natural environment, but the difference was non‐significant for males and marginally significant for females. In contrast to the relatively weak relationship between RS and origin (male P = 0.347, η 2 = 0.008; female P = 0.066, η 2 = 0.037), we observed a strong relationship between RS and return year (male P < 0.001, η 2 = 0.896; female P < 0.001, η 2 = 0.867) (i.e., hatchery‐ and natural‐origin fish did well or poorly together each year). Hatchery origin fish exhibited reduced genetic diversity, as well as evidence of increased temporal population structure among hatchery fish. We suspect the latter is an artifact of culture practices that reduce diversity in age at smoltification. We conclude that the program was successful in achieving an increase in adult return, but not in avoiding negative genetic effects on the population, and that any lasting impacts of supplementation remain to be determined.","PeriodicalId":23214,"journal":{"name":"Transactions of The American Fisheries Society","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135307050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Colby D. Denison, Amy Cottrell, Troy M. Farmer, Dewayne A. Fox, David M. Hood, William C. Post, Gregory Sorg, Ellen Waldrop, Brandon K. Peoples
{"title":"Seasonal migration cues differ for dual spawning Atlantic Sturgeon in the Great Pee Dee River","authors":"Colby D. Denison, Amy Cottrell, Troy M. Farmer, Dewayne A. Fox, David M. Hood, William C. Post, Gregory Sorg, Ellen Waldrop, Brandon K. Peoples","doi":"10.1002/tafs.10431","DOIUrl":"https://doi.org/10.1002/tafs.10431","url":null,"abstract":"Abstract Objective We investigated environmental variables associated with spawning migration behavior for a dual‐spawning population of endangered Atlantic Sturgeon Acipenser oxyrinchus oxyrinchus in the Great Pee Dee River, South Carolina. Methods From 2016 to 2021, 147 Atlantic Sturgeon were captured, implanted with acoustic transmitters, and monitored using a stationary array of 40 receivers located every 5–20 km along a 302‐km section of the Great Pee Dee River from the river mouth at Winyah Bay to the first movement barrier at Blewett Falls Dam, North Carolina. Result We observed 47 Atlantic Sturgeon attempting 74 spring migrations and 39 Atlantic Sturgeon attempting 76 fall migrations across 4 years of telemetry observations (2018–2021). Mixed‐effects models indicated that discharge interacted with water temperature to affect both migration initiation and upriver movement, and these interactions differed between the spring and fall runs. Spring runs were cued by rising temperatures and high river discharge, whereas fall runs were cued by falling temperatures and low discharge. Within migrations, spring‐run fish migrated further upriver when discharge was falling, and fall‐run fish moved further upriver when discharge was rising. Overall, fall‐run sturgeon migrated significantly further upriver than spring‐run sturgeon. Conclusion Differences in migratory behavior between the two runs suggest potentially unique adaptations to ambient river conditions during the respective spawning seasons. Identifying the environmental factors that drive—and thereby limit—Atlantic Sturgeon migrations in the Great Pee Dee River informs regional recovery efforts and highlights the importance of studying and managing this species at the population level.","PeriodicalId":23214,"journal":{"name":"Transactions of The American Fisheries Society","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136081128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tyler R. Funnell, Travis O. Brenden, Richard Kraus, Tom MacDougall, James Markham, Charles Murray, Jason Robinson, Christopher S. Vandergoot
{"title":"Seasonal spatial ecology of Lake Trout in Lake Erie","authors":"Tyler R. Funnell, Travis O. Brenden, Richard Kraus, Tom MacDougall, James Markham, Charles Murray, Jason Robinson, Christopher S. Vandergoot","doi":"10.1002/tafs.10430","DOIUrl":"https://doi.org/10.1002/tafs.10430","url":null,"abstract":"Abstract Objective Lake Trout Salvelinus namaycush are native coldwater apex predators that play an important role in maintaining ecosystem functionality and diversity in the Laurentian Great Lakes. Following population collapses, rehabilitation efforts were widely initiated in the Great Lakes to reestablish self‐sustaining Lake Trout populations. Lake Erie may pose a challenge to these rehabilitation efforts due to limited availability of appropriate oxythermal habitat. Our goal was to investigate seasonal habitat use of adult Lake Trout in Lake Erie to inform management and rehabilitation efforts. Methods We used acoustic telemetry in Lake Erie, which was equiped with a lake‐wide acoustic receiver grid, to quantify Lake Trout seasonal region occupancy, dispersal distances, bottom depth occupancy, space use extent, and space use overlap. Result We found that 32% of fish tagged in the eastern basin and all fish from the western basin dispersed more than 100 km from their tagging location, which represents a greater proportion of the population moving long distances than what has been previously documented in the Great Lakes. During stratification, Lake Trout were detected almost exclusively in the offshore eastern basin in areas where water depth exceeded 25 m. During nonstratified seasons, fish used other regions of the lake, occupying areas of highly variable depths. During fall, most fish tagged in the eastern basin occupied habitat along the southern shore of the eastern basin. Fish tagged in the western basin returned to this region in the fall of subsequent years despite occupying the offshore eastern basin during stratification and having depth occupancy, home range size, and overlap similar to that of eastern basin‐tagged fish. Fish size was positively correlated with receiver depth during winter and spring, and with home range overlap during spring and summer. Conclusion The results of this study can begin to inform management decisions regarding stocking locations, harvest regulations, and habitat restoration to facilitate the continued rehabilitation of this important native species.","PeriodicalId":23214,"journal":{"name":"Transactions of The American Fisheries Society","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134961765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Christopher W. Burns, Pascale Gibeau, David Robichaud, Cameron McCulloch, Julio Novoa, Krystal Lockert
{"title":"Eulachon migration patterns in the lower Fraser River revealed through acoustic telemetry","authors":"Christopher W. Burns, Pascale Gibeau, David Robichaud, Cameron McCulloch, Julio Novoa, Krystal Lockert","doi":"10.1002/tafs.10428","DOIUrl":"https://doi.org/10.1002/tafs.10428","url":null,"abstract":"Abstract Objective The Fraser River in British Columbia, Canada, historically supported productive Indigenous, recreational, and commercial fisheries for Eulachon Thaleichthys pacificus . Although Eulachon spend most of their lives in the marine environment, they spawn in freshwater and it is hypothesized that habitat degradation in the Fraser River has contributed to population decline. A greater understanding of Eulachon life history strategies is necessary to develop species recovery strategies. The purpose of this study was to provide insight into population demographics, migration timing, residence time, travel speed and distance, and movement patterns of Eulachon traveling in the Fraser River by conducting index netting and acoustic telemetry. Methods In total, 244 Eulachon were acoustically tagged at the mouth of the Fraser River, and their movements were monitored using acoustic receivers in the lowermost 70 km of the Fraser River and in the Pitt River (a tributary to the Fraser River) over a 2‐year period. Result Tagged Eulachon displayed heterogeneous movement behaviors and a protracted migration period between February and May. Eulachon index gill netting revealed three discrete migration groups matching traditional ecological knowledge from Indigenous knowledge holders. There were shifts in population demographics, with sex ratios changing from predominately males to females throughout the migration. Residence time within the estuarine salt wedge and river was short. Upstream travel speeds varied significantly between sexes and slowed as fish traveled upstream. Conclusion Overall, Eulachon travel speeds, travel distances, and residence times, along with size and sex effects, provided insights into movement patterns. These results will increase our understanding of sex‐specific risks related to instream disturbance, harvest, and predation and will inform management decisions regarding protection of critical habitats. The observed patterns highlight the need for stock assessment methods to consider all discrete migration groups and will assist in prioritizing species recovery efforts.","PeriodicalId":23214,"journal":{"name":"Transactions of The American Fisheries Society","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135254566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Spencer VanderBloemen, L. Miranda, G. Sass, Michael Colvin, N. Faucheux
{"title":"Influence of Invasive Bigheaded Carps on Abundance of Gizzard Shad in the Tennessee River","authors":"Spencer VanderBloemen, L. Miranda, G. Sass, Michael Colvin, N. Faucheux","doi":"10.1002/tafs.10442","DOIUrl":"https://doi.org/10.1002/tafs.10442","url":null,"abstract":"The Tennessee River basin and its cascade of reservoirs are home to some of the most diverse freshwater fish assemblages in the world. This unique system is threatened by the ongoing invasion of Silver Carp Hypophthalmichthys molitrix and Bighead Carp H. nobilis, hereafter bigheaded carps. Bigheaded carps may directly compete for food resources with native clupeid species such as Gizzard Shad Dorosoma cepedianum, and this potential interaction could have damaging ecological and economic consequences. High relative abundances of Gizzard Shad are crucial to the Tennessee River food web and associated fisheries because of their role as a forage base for piscivorous species. We analyzed a collection of annual gillnetting and electrofishing data spanning from 1990 to 2017, to test whether Gizzard Shad relative abundances have changed in Tennessee River reservoirs since the arrival of bigheaded carps. Our analyses indicated that Gizzard Shad abundances have been declining but were already declining prior to the arrival of bigheaded carps in the Tennessee River. At this stage in the invasion, we could not attribute a cause‐and‐effect to the inverse relationship between Gizzard Shad and bigheaded carps, but we advise continued monitoring of indicators of harmful interactions.","PeriodicalId":23214,"journal":{"name":"Transactions of The American Fisheries Society","volume":"153 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50882821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}