Charles Hinchliffe, H. Schilling, Pierre Pepin, Fonti Kar, Daniel S Falster, I. Suthers
{"title":"Rapid inference of larval fish recruitment potential from size spectrum models.","authors":"Charles Hinchliffe, H. Schilling, Pierre Pepin, Fonti Kar, Daniel S Falster, I. Suthers","doi":"10.1139/cjfas-2024-0067","DOIUrl":"https://doi.org/10.1139/cjfas-2024-0067","url":null,"abstract":"The ratio of mortality to growth of larval fish provides a metric of a cohort’s ‘recruitment potential’. Estimating recruitment potential is arduous, requiring growth and mortality to be estimated independently. Here, we propose using the exponent of size spectrum models to indicate recruitment potential from body measurement data alone. This approach has several advantages including 1) reducing data collection times, 2) removing uncertainty in estimates generated from age estimation, and 3) allowing re-analysis of larval fish databases or archived collections. To test the validity of this approach, we conduct simulations comparing estimates of recruitment potential from an abundance spectrum model with other common methods. By varying larval flux rates, growth, mortality, and measurement error, we show the abundance spectrum model is more accurate and precise at smaller sample sizes, and more robust to variance in individual rates and measurement error of ages, but more susceptible to measurement error of size. We highlight that a size-based approach to estimating recruitment potential provides another useful tool for understanding larval survival, reducing resource demands on research compared to traditional methods.","PeriodicalId":9515,"journal":{"name":"Canadian Journal of Fisheries and Aquatic Sciences","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141821258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Christina A.D. Semeniuk, Kathleen D.W. Church, Felix Eissenhauer, Jaime Grimm, Robert M Hechler, Bradley E Howell, S. V. Ivanova, Sandra Klemet-N'Guessan, C. Madliger, Jessica L Reid, Kendra Thompson-Kumar, Ivan Arismendi, Brooke E. Penaluna, Andrea E. Kirkwood, Catherine M. Febria
{"title":"On Increasing Equity and Inclusion of Early-Career Professionals for Conferences and Conference Networking in Canadian Fisheries and Aquatic Science Societies","authors":"Christina A.D. Semeniuk, Kathleen D.W. Church, Felix Eissenhauer, Jaime Grimm, Robert M Hechler, Bradley E Howell, S. V. Ivanova, Sandra Klemet-N'Guessan, C. Madliger, Jessica L Reid, Kendra Thompson-Kumar, Ivan Arismendi, Brooke E. Penaluna, Andrea E. Kirkwood, Catherine M. Febria","doi":"10.1139/cjfas-2024-0033","DOIUrl":"https://doi.org/10.1139/cjfas-2024-0033","url":null,"abstract":"As early-career professionals (ECPs) navigate their education and professional development in the aquatic sciences, many seek to build a network to help guide their entrance into the field. Scientific societies play a vital role through hosted conferences, where ECPs can meet and share ideas with others and find mentors. However, not all ECPs are the same, and those from marginalized backgrounds face unique challenges. Here, we provide a perspective on ways scientific societies can ensure all members are provided with equitable opportunity to discover, access, and build career-defining networks at conference events, including the critical role of mentors in navigating obstacles to success. Our recommendations originate from an early-career networking workshop in 2022 at a Canadian fisheries and aquatic sciences conference. The day-long hybrid event comprised interactive activities and discussions on how societies and their conferences can foster and promote inclusive networking for all, including online attendees. This perspective serves as a call to action for scientific societies and senior-career professionals to meaningfully engage with early-career professionals and marginalized members to promote transformative science.","PeriodicalId":9515,"journal":{"name":"Canadian Journal of Fisheries and Aquatic Sciences","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141824003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Benjamin King, Corey J. Morris, John M. Green, Robert S Gregory, Paul V. R. Snelgrove, David Cote, C. Pennell
{"title":"Acoustic telemetry and network analysis reveal seasonal spatial overlap between gadid species in a subarctic coastal marine protected area","authors":"Benjamin King, Corey J. Morris, John M. Green, Robert S Gregory, Paul V. R. Snelgrove, David Cote, C. Pennell","doi":"10.1139/cjfas-2023-0272","DOIUrl":"https://doi.org/10.1139/cjfas-2023-0272","url":null,"abstract":"The Gilbert Bay MPA was established in Labrador, Canada to protect a resident population of Atlantic cod (Gadus morhua) and associated habitat. However, fisheries removals outside MPA boundaries have contributed to population decline and increases in potentially competing species may hinder recovery. Using acoustic telemetry and network analyses, we compared movements of Gilbert Bay cod (n = 23), conspecifics from offshore environments (offshore Atlantic cod, n = 19), and Greenland cod (Gadus ogac, n = 14) within and outside MPA boundaries from August 2014 – June 2017. Similar summer space use resulted in species overlap at seaward MPA boundaries and outside the MPA. In winter, Gilbert Bay and Greenland cod distributions overlapped within some MPA areas, and offshore Atlantic cod were absent. Some Gilbert Bay cod remained within the MPA year-round. Summer vulnerability to fisheries harvest outside MPA boundaries and winter overlap with competing Greenland cod within the MPA, may collectively challenge Gilbert Bay cod population recovery. Our study demonstrates the utility of acoustic telemetry and network analyses in evaluating animal movements for MPA management.","PeriodicalId":9515,"journal":{"name":"Canadian Journal of Fisheries and Aquatic Sciences","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141655699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Joseph D Schmitt, A. Gorman, Carey T. Knight, Mark R. Dufour, James J. Roberts, Travis Hartman
{"title":"Multi-decadal trophic shifts in Lake Erie Yellow Perch Perca flavescens","authors":"Joseph D Schmitt, A. Gorman, Carey T. Knight, Mark R. Dufour, James J. Roberts, Travis Hartman","doi":"10.1139/cjfas-2023-0348","DOIUrl":"https://doi.org/10.1139/cjfas-2023-0348","url":null,"abstract":"In Lake Erie, yellow perch Perca flavescens support vast commercial and recreational fisheries, yet populations have recently declined. Using N=5,889 yellow perch stomachs collected from 1997 to 2021, we explore trends in the feeding ecology and trophic level of yellow perch with generalized additive models (GAMs). Models revealed a significant decrease in yellow perch trophic level (-0.15 trophic levels in the last decade), and significant dietary shifts. Yellow perch have shifted away from feeding on piscine prey and round goby Neogobius melanostomus over the 25-year time series, and now feed on invertebrates more frequently – including invasive waterfleas (Bythotrephes longimanus and Cercopagis pengoi) and Chironomids. Dietary patterns appear to reflect broad ecological changes – invasive waterfleas have proliferated while populations of forage fish and round goby have declined. Furthermore, hypoxia events have increased in duration and severity, which may explain observed increases in Chironomid consumption, which are hypoxia tolerant. This study demonstrates trophic adaptability in yellow perch, which have changed feeding behavior and trophic position in response to novel invaders and changing environmental conditions.","PeriodicalId":9515,"journal":{"name":"Canadian Journal of Fisheries and Aquatic Sciences","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141666334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Les D. Warren, Andrew E. Honsey, David B. Bunnell, Paris D. Collingsworth, Darryl W. Hondorp, Charles P. Madenjian, David M. Warner, Brian C. Weidel, Tomas O. Hӧӧk
{"title":"Synchrony of alewife, Alosa pseudoharengus, year-class strength in the Great Lakes region","authors":"Les D. Warren, Andrew E. Honsey, David B. Bunnell, Paris D. Collingsworth, Darryl W. Hondorp, Charles P. Madenjian, David M. Warner, Brian C. Weidel, Tomas O. Hӧӧk","doi":"10.1139/cjfas-2023-0322","DOIUrl":"https://doi.org/10.1139/cjfas-2023-0322","url":null,"abstract":"Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print. <br/> Fish recruitment is interannually variable and challenging to predict. Annual recruitment is often regionally synchronized among populations and identifying drivers of such synchrony may help shed light on recruitment dynamics. We investigated interannual variation of alewife Alosa pseudoharengus recruitment by estimating year-class strength for populations from three of the Laurentian Great Lakes (lakes Huron, Michigan, and Ontario) using annual assessment survey data from 1968 to 2022. We first determined the age when year-class strength was set for each dataset. We then used a mixed-modeling approach incorporating age, year-class, and sampling year to estimate year-class strength for each study lake. Thereafter, we evaluated regional synchrony in year-class strength across the three lakes and evaluated potential climatic drivers of synchrony. Our results suggest that alewife year-class strength is set by age-1. Our model-derived indices of alewife year-class strength were synchronized among the three lakes, and we identified spring-summer degree-days as a potential regional driver of synchrony. This analysis highlights the potential for strong influence of climatic conditions on fish recruitment in large freshwater systems.","PeriodicalId":9515,"journal":{"name":"Canadian Journal of Fisheries and Aquatic Sciences","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142262810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Potential of communication devices for estimating the fishing effort of purse seine fleets","authors":"Tsoi Kwan Chui, Nobuyuki Yagi, Yutaro Sakai","doi":"10.1139/cjfas-2023-0291","DOIUrl":"https://doi.org/10.1139/cjfas-2023-0291","url":null,"abstract":"Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print. <br/> Fishing impacts the marine environment significantly, and quantifying this impact requires precise fishing effort data. This study explores the challenges associated with accurately estimating fishing effort by purse seiners and proposes a solution using records collected from real-time communication devices on fishing fleets. The estimation of fishing effort based on high-frequency GPS data can be verified with the onboard visual records. Additionally, by linking vessels within a fleet, the method utilizes information from carriers (vessels that transport fish) to enhance the estimation. Through the use of generalized additive models, this study effectively estimates the fishing effort of Japanese purse seiners, demonstrating their accuracy. Furthermore, by incorporating carrier information, models based on matched records prove to have superior predictive performance compared to those based on fishing vessel or carrier records alone. These findings lay the foundation for the potential of this approach to provide precise and cost-effective information for sustainable fishery management. The affordability of GPS devices and the common requirement of communication devices across various fleets further support the feasibility of implementing this approach.","PeriodicalId":9515,"journal":{"name":"Canadian Journal of Fisheries and Aquatic Sciences","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142262811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Modeling Slough Crayfish Populations in Response to Hydrologic Variability","authors":"Dylan Sinnickson, Nathan Dorn","doi":"10.1139/cjfas-2024-0052","DOIUrl":"https://doi.org/10.1139/cjfas-2024-0052","url":null,"abstract":"Understanding and predicting animal population dynamics as a function of hydrologic variation is critical for the management of freshwater ecosystems. Crayfish are important fauna supported by the hydro-dynamic freshwater wetlands of the Everglades. We modeled the complex relationships between slough crayfish (Procambarus fallax) population densities and hydrologic conditions using a spatially and temporally extensive 21-year dataset. We applied linear mixed–effect models, a classification and regression tree (CART), and random forest (RF) algorithms to develop predictions and eco-hydrologic interpretations. The random forest model demonstrated the greatest predictive ability (R2 = 0.56) followed by linear mixed–effect models (R2 = 0.45) and the regression tree (R2 = 0.29). Primary effects of hydrologic terms were similar among models, but the RF model identified important nonlinear and threshold relationships. Lower average depths (appr. 30–60 cm) over the year prior to the sample, in conjunction with relatively long periods of inundation, and moderate recent depths, were associated with greater crayfish densities. The three methods revealed consistent understanding of crayfish eco-hydrologic relations and provide insight for natural resource management.","PeriodicalId":9515,"journal":{"name":"Canadian Journal of Fisheries and Aquatic Sciences","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141340982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lydia Mae White, B. Sainte-Marie, Peter Lawton, Rémy Rochette
{"title":"Using benthic recruitment densities to forecast fisheries recruitment of American lobster in Atlantic Canada","authors":"Lydia Mae White, B. Sainte-Marie, Peter Lawton, Rémy Rochette","doi":"10.1139/cjfas-2023-0277","DOIUrl":"https://doi.org/10.1139/cjfas-2023-0277","url":null,"abstract":"There is limited understanding of the mechanisms underlying the marked spatial and temporal trends in landings of American lobster in Canada since the mid 1980’s, and little ability to forecast changes. We built an individual-based model for three Lobster Fishing Areas (LFAs) in Canada that uses the annual density of benthic recruits in nursery grounds to generate an index of exploited biomass 6 to 10 years in the future, using von Bertalanffy growth equations complemented with inter-individual variability in growth, and regional maturity ogives and spawning probabilities to allow exclusion of ovigerous females from the exploitable biomass. We found significant positive relationships between the modelled biomass index and fisheries landings in all three LFAs. Out-of-sample validation in two LFAs (longer time series) using 1-year and 6-year reduced data sets revealed mean annual prediction errors of 11.4% and 11.2%, and 23.7% and 51.7%, respectively. Our findings strongly suggest benthic recruitment indices could help make strategic decisions concerning lobster fishing activities, and they argue for the continued and expanded monitoring of lobster benthic recruitment in Canada.","PeriodicalId":9515,"journal":{"name":"Canadian Journal of Fisheries and Aquatic Sciences","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141354683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mark Saunders, R. Steeves, Leah P. Macintyre, Kyle M. Knysh, Michael Coffin, M. Boudreau, Christina C. Pater, M R van den Heuvel, S. Courtenay
{"title":"Monitoring estuarine fish communities – environmental DNA (eDNA) metabarcoding as a complement to beach seining","authors":"Mark Saunders, R. Steeves, Leah P. Macintyre, Kyle M. Knysh, Michael Coffin, M. Boudreau, Christina C. Pater, M R van den Heuvel, S. Courtenay","doi":"10.1139/cjfas-2023-0227","DOIUrl":"https://doi.org/10.1139/cjfas-2023-0227","url":null,"abstract":"Environmental DNA (eDNA) metabarcoding offers advantages over physical capture for identifying and quantifying animals in monitoring programs. In this study, the fish community was sampled at three stations (inner, middle, and outer estuary) in three estuaries in August 2020, and four estuaries in June and August 2021 (Prince Edward Island, Canada) using both beach seining and eDNA metabarcoding. Two 12S primer sets, 12S-160 and 12S-248F, with different amplicon lengths, yielded similar results. eDNA metabarcoding consistently detected species captured by 186 co-located beach seines and revealed additional species. It also detected monthly (June-August), interannual (2020-2021), and spatial shifts in the fish community, distinguishing stations separated by as little as 0.4 km. Positive correlations existed between eDNA metabarcoding species reads and beach seining captures. These findings suggest eDNA metabarcoding complements physical capture methods for characterising nearshore fish communities in Prince Edward Island’s estuaries. While eDNA techniques lack certain population parameter information provided by physical methods, such as size, sex, and age structure, they offer a more comprehensive diversity assessment and presence-abundance insights, especially in inaccessible environments.","PeriodicalId":9515,"journal":{"name":"Canadian Journal of Fisheries and Aquatic Sciences","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141361200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Species communities can accurately predict the occurrence of an imperilled fish","authors":"Jacob W Brownscombe, Paul Bzonek, D. A. R. Drake","doi":"10.1139/cjfas-2023-0168","DOIUrl":"https://doi.org/10.1139/cjfas-2023-0168","url":null,"abstract":"Species distribution information is essential for conservation. However, sampling the full range of a species’ potential distribution is rarely feasible, necessitating the development of models to predict distributions, as well as relevant environmental and biotic drivers. We applied a novel approach to model the distribution of a species at risk in Canada, silver shiner (SS; Notropis photogenis) in tributaries of Lake Ontario using the fish community as a predictor of SS occurrence. Associative Rule Learning (ARL) identified simple species combinations that provided strong insight into SS distribution, which may be particularly useful for identifying new occupied locations, including making sampling decisions in real time. The species with the most positive or negative associations with SS identified by ARL were included in a random forests model, which predicted SS distribution with high accuracy in test data from the study tributary system and in a neighboring system where SS is exceedingly rare. Predicting species distributions based on biotic associations presents opportunities for discovering new populations, identifying critical habitat, and evaluating the suitability of sites for reintroduction potential.","PeriodicalId":9515,"journal":{"name":"Canadian Journal of Fisheries and Aquatic Sciences","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141361521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}