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Fisheries management

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Articles 1 - 30 of 95

Full-Text Articles in Life Sciences

Life History, Stock Status, And Movement Ecology Of Narrow-Barred Spanish Mackerel, Scomberomorus Commerson (Lacépède, 1800) In The Southern Arabian Gulf, Mohamed Abdulla Almusallami May 2026

Life History, Stock Status, And Movement Ecology Of Narrow-Barred Spanish Mackerel, Scomberomorus Commerson (Lacépède, 1800) In The Southern Arabian Gulf, Mohamed Abdulla Almusallami

Thesis/ Dissertation Defenses

The narrow-barred Spanish mackerel, Scomberomorus commerson, is the most commercially valuable pelagic fish species in the Arabian Gulf. This thesis integrated three studies to comprehensively assess the life history, stock status, and movement ecology of this species in Abu Dhabi waters. Life history traits were characterized from data collected during a 15-month monitoring program (January 2019–May 2020). Fork length ranged from 30.5 to 132 cm. Growth parameters were k = 0.14–0.15 year⁻¹ and L∞ = 128.9–135.4 cm for males and females, respectively. Size-at-maturity (Lm₅₀) was 78.7 cm FL for females and 69.7 cm FL for males. The spawning season occurred …

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Enhancing Walleye (Ogaa) Recruitment: Evaluating Assisted Reproduction As A Mitigation Strategy, Douglass Keiser May 2026

Enhancing Walleye (Ogaa) Recruitment: Evaluating Assisted Reproduction As A Mitigation Strategy, Douglass Keiser

Biology Graduate Theses

Over the past several decades, cold- and cool-water fish populations across the Upper Midwest, including Minnesota and Wisconsin, have shown troubling signs of decline. Among the most affected is the walleye/Ogaa (Sander vitreus), a species deeply embedded in the ecological balance, cultural identity, and economic vitality of the region, and central to the lifeways, treaty-reserved rights, and resource stewardship of Tribal Nations, including Ojibwe communities across the Upper Midwest. Despite ongoing stocking efforts and harvest regulations, many lake systems have experienced persistent declines in natural recruitment, prompting resource agencies to investigate the underlying causes. One such system is …

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Largemouth Bass Diet Changes Through The Summer In Central Minnesota, Ethan Kunz Jan 2026

Largemouth Bass Diet Changes Through The Summer In Central Minnesota, Ethan Kunz

Journal of Earth and Life Science

Largemouth Bass Micropterus nigricans is one of the most widespread fish species in the world, due in part to human introduction for angling. Largemouth Bass are opportunistic predators that will consume the largest prey they can often find; however, it has been shown that their diet mainly consists of invertebrates such as crayfish, with less focus on other fish species. This research aimed to determine what the Largemouth Bass diets in Central Minnesota consist of, and how they may change from the beginning of summer through the beginning of fall. A total of 174 Largemouth Bass were sampled from late …

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Characterization Of A Coastwide Sheepshead (Archosargus Probatocephalus) Fishery Reveals Increased Fishing Pressure During Spawning Activity In Texas, Ethan T. Getz, Catherine M. Eckert, Charles Downey Iii Jan 2026

Characterization Of A Coastwide Sheepshead (Archosargus Probatocephalus) Fishery Reveals Increased Fishing Pressure During Spawning Activity In Texas, Ethan T. Getz, Catherine M. Eckert, Charles Downey Iii

Gulf and Caribbean Research

Sheepshead (Archosargus probatocephalus) have been characterized as one of the most vulnerable species to overfishing in the Gulf of Mexico (GOM) based on their reproductive strategy of spawning in aggregations. Here, we analyzed fishery—independent and dependent data (1983—2023) collected by the Texas Parks and Wildlife Department to assess Sheepshead populations and describe the fishery in Texas. Gill net sampling was used to describe Sheepshead abundance and distribution, while creel survey data and commercial landings were used to determine spatial and temporal characteristics of the fishery and evaluate targeted fishing activity during the spawning season. Sheepshead encountered in gill …

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Statewide Northern Pike Response To Minnesota’S 2018 Regulation Change, Elijah Wozniak Jan 2026

Statewide Northern Pike Response To Minnesota’S 2018 Regulation Change, Elijah Wozniak

Journal of Earth and Life Science

Management of northern pike (Esox lucius) is challenging because it attempts to balance ecological sustainability with angler interests. Northern pike often stunt their own growth by diminishing the size and abundance of prey fish, their food source. Anglers are often displeased when small pike occur in high population densities. In response to populations of small northern pike, the DNR implemented a new, statewide northern pike regulation in 2018. The objective of this study was to determine whether the regulation successfully changed the mean weight, length, and CPUE of northern pike in Minnesota. The secondary objective was to test …

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Comparison Of Calcified Structures To Estimate Ages Of Northern Pike Esox Lucius In Various Lakes, Kaed Rauk Jan 2026

Comparison Of Calcified Structures To Estimate Ages Of Northern Pike Esox Lucius In Various Lakes, Kaed Rauk

Journal of Earth and Life Science

Northern pike Esox lucius are a dominant predatory fish in many aquatic systems. They can have significant impacts on the ecosystems they inhabit and are also a popular game fish among anglers. However, northern pike are a difficult species to age accurately. This study aimed to compare calcified aging structures to identify trends and determine which structure provides the most accurate age estimates. A total of 119 northern pike were sampled, and multiple structures from each fish were independently aged by two readers. The coefficient of variation (CV) was calculated for each structure to assess precision. Sectioned sagittal otoliths exhibited …

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Size Structure Comparison Of Bluegill In Lakes With And Without Special Regulations, Jenna Lawin Jan 2026

Size Structure Comparison Of Bluegill In Lakes With And Without Special Regulations, Jenna Lawin

Journal of Earth and Life Science

Lots of individuals have mixed feelings about special regulations for all sorts of game fish species such as northern pike Esox lucius, crappie Pomoxis spp., sunfish Lepomis spp., and so on. One species commonly sought after by many is bluegill Lepomis macrochirus. Bluegill are often deemed easy to find, catch, and clean. This study looks at three different categories of lakes (all lakes contain bluegill populations). The three categories are lakes with a five sunfish limit, lakes with a ten sunfish limit, and lakes without any special regulations. This study provides valuable insight into the size …

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Typology And Spatiotemporal Patterns Of Illegal Fishing Activities In The Philippines: Implications For Fisheries Management, Marlowe O. Acevedo, Tzu-Yun Ching, Chih-Shin Chen Jan 2026

Typology And Spatiotemporal Patterns Of Illegal Fishing Activities In The Philippines: Implications For Fisheries Management, Marlowe O. Acevedo, Tzu-Yun Ching, Chih-Shin Chen

Journal of Marine Science and Technology–Taiwan

Illegal, unreported, and unregulated (IUU) fishing activity is a global threat and continues to undermine the effectiveness of fisheries regulations and management measures. However, the extent of illegal fishing in Philippine waters remains unclear. This study aims to identify the types of illegal fishing in Philippine waters and analyzed their temporal and spatial patterns. Data were obtained from the records of the Philippine Coast Guards (PCG) and Maritime Law Enforcement Agencies from 2015 to 2020. A total of 602 apprehensions were recorded, resulting in 813 violations, of which 630 cases were fishery violations. Most of the watercrafts involved in the …

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Fisheries Research Report No. 350: Recreational Vessel Retrievals In Western Australia - 2009 To 2024, Stephen C. Bradshaw, Claire B. Smallwood, Stuart J. Blight, Troy Matthews, Karina L. Ryan Aug 2025

Fisheries Research Report No. 350: Recreational Vessel Retrievals In Western Australia - 2009 To 2024, Stephen C. Bradshaw, Claire B. Smallwood, Stuart J. Blight, Troy Matthews, Karina L. Ryan

Fisheries Research Reports

This report provides a time series (2009 – 2024) of the total number of recreational vessel (powerboat) retrievals at a spatial (boat ramp) and temporal (annual, month, hour) resolution for 32 boat ramps distributed from Wyndham to Esperance. This time series has been developed using a workflow that outlines each step, from acquiring raw video data to producing a completed time series of vessel retrievals. As part of this workflow, modelling was undertaken to impute counts of vessel retrieval for sites and hours for which data had not been read, or for which there were significant outages. Features within the …

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Movement Ecology And Trophic Dynamics In The Northern Gulf Of Mexico: Implications For Fisheries Management, Calvin Chee May 2025

Movement Ecology And Trophic Dynamics In The Northern Gulf Of Mexico: Implications For Fisheries Management, Calvin Chee

Master's Theses

The northern Gulf of Mexico (nGOM) is a diverse and productive region for living marine resources. The region supports lucrative commercial and recreational fisheries ranging from low-trophic-level species, such as penaeid shrimps and forage fishes, to high-trophic-level predators (e.g. Yellowfin Tuna). This thesis contributes to the region’s ecological knowledge, with the primary aim of enhancing management efforts and providing direct management advice to two important fisheries. In Chapter 1, we develop a traditional per-recruit model for Southern Flounder, as well as a spatiotemporally integrated per-recruit model that incorporates the spatial distribution of fishing effort and the stock’s movement ecology. Fish …

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Common Terns (Sterna Hirundo) As Bioindicators For Atlantic Herring (Clupea Harengus) Distribution In The Gulf Of Maine, Logan R. Becker Apr 2025

Common Terns (Sterna Hirundo) As Bioindicators For Atlantic Herring (Clupea Harengus) Distribution In The Gulf Of Maine, Logan R. Becker

Student Publications

Effective fisheries management is increasingly challenged by climate-driven shifts in species distribution and by a lack of data on early life stages of key forage fish species. In the Gulf of Maine, Atlantic herring (Clupea harengus), a once economically dominant fishery species and a key prey species for many dependent predators, has declined due to poor early-stage recruitment and warming waters. Despite this decline, current trawl surveys do not inform early-stage Atlantic herring distribution due to mesh size limitations, leaving critical gaps in our knowledge. To address this knowledge gap, I used common terns (Sterna hirundo) …

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Size Structure Of Black Crappie And Bluegill In Northern, Eastern, Western, And Southern Minnesota, Ray Anderson Jan 2025

Size Structure Of Black Crappie And Bluegill In Northern, Eastern, Western, And Southern Minnesota, Ray Anderson

Journal of Earth and Life Science

Fish size structure is an important factor in a fishery population. Panfish such as black crappie Pomoxis nigromaculatus and bluegill Lepomis macrochirus play a major role in the health of fisheries. Five lakes from southern, northern, eastern, and western Minnesota were selected for analysis. Data were collected using standard sampling methods, including gill nets, electrofishing, and fyke nets. Length-frequency distributions were created to assess size structure in each region. Relative abundance was measured using catch per unit effort. Data analysis included a one-way ANOVA to compare Proportional Size Distribution (PSD) values and the distribution of fish sizes among regions. Chi-square …

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Stakeholder Perspectives On The Status And Conservation Management Of Critically Endangered Nassau Grouper In The Bahamas, Krista D. Sherman, Lester Gittens Jan 2025

Stakeholder Perspectives On The Status And Conservation Management Of Critically Endangered Nassau Grouper In The Bahamas, Krista D. Sherman, Lester Gittens

Gulf and Caribbean Research

Ensuring the sustainability of marine resources that provide food, economic security and other critical ecosystem services is a major challenge globally. Assessing stakeholders’ knowledge and perceptions of the status of fisheries and how they should be managed can yield important insights to facilitate the development of management frameworks that are likely to assist with achieving sustainability. As a socioeconomically and culturally important and critically endangered species, evaluating stakeholder perspectives on the status of the Nassau Grouper fishery is critical to help inform policy. Knowledge and perceptions of stakeholders working in The Bahamas were assessed using voluntary participatory approaches, including a …

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Estimation Of Effective Number Of Breeders And Effective Population Size In An Abundant And Heavily Exploited Marine Teleost, Andrea Bertram, Justin Bell, Chris Brauer, David Fairclough, Paul Hamer, Jonathan Sandoval-Castillo, Maren Wellenreuther, Luciano B. Beheregaray Jul 2024

Estimation Of Effective Number Of Breeders And Effective Population Size In An Abundant And Heavily Exploited Marine Teleost, Andrea Bertram, Justin Bell, Chris Brauer, David Fairclough, Paul Hamer, Jonathan Sandoval-Castillo, Maren Wellenreuther, Luciano B. Beheregaray

Fisheries Research Articles

Obtaining reliable estimates of the effective number of breeders (Nb) and generational effective population size (Ne) for fishery-important species is challenging because they are often iteroparous and highly abundant, which can lead to bias and imprecision. However, recent advances in understanding of these parameters, as well as the development of bias correction methods, have improved the capacity to generate reliable estimates. We utilized samples of both single-cohort young of the year and mixed-age adults from two geographically and genetically isolated stocks of the Australasian snapper (Chrysophrys auratus) to investigate the feasibility of generating reliable Nb and Ne estimates for a …

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Population Demography, Occupancy, And Connectivity Of Invasive Bigheaded Carp In The Platte River, Nebraska And Its Tributaries, Blake W. Logan Jul 2024

Population Demography, Occupancy, And Connectivity Of Invasive Bigheaded Carp In The Platte River, Nebraska And Its Tributaries, Blake W. Logan

School of Natural Resources: Dissertations, Theses, and Student Research

Silver Carp Hypophthalmichthys molitrix and Bighead Carp H. nobilis, collectively referred to as bigheaded carp, are invasive species in the United States of America that have expanded their range throughout the Missouri River basin in the last three decades. It may be desirable to develop management plans directed at the monitoring, control, or removal of bigheaded carp within the Missouri River basin. However, a knowledge gap exists regarding bigheaded carp ecology in Missouri River tributaries, which may be important for the development of management plans. As such, this study characterized bigheaded carp population demographics, occupancy, and connectivity in …

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Post-Mucilage Status Of The Teleost Fish Assemblages In The Sea Of Marmara, Mustafa Sari, Uğur Karadurmuş May 2024

Post-Mucilage Status Of The Teleost Fish Assemblages In The Sea Of Marmara, Mustafa Sari, Uğur Karadurmuş

Turkish Journal of Zoology

A frightening mucilage event occurred in the Sea of Marmara (SoM) from November 2020 to July 2021, leaving devastating effects on maritime industries, fishing activities and the benthic ecosystem. The mucilage led to intense fish mortalities, particularly affecting species like smelt, anchovy, and picarel, with severe consequences for benthic ecosystems and various marine species. This study aims to analyze the possible long-term effects of the recent mucilage disaster on species diversity and biomass by assessing the current status of teleost fish assemblages in the SoM. The data set is based on bottom trawl surveys carried out at 52 points at …

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Specific Measurements Of A Yellow Perch Head Compared To The Total Length, Alex Timm Jan 2024

Specific Measurements Of A Yellow Perch Head Compared To The Total Length, Alex Timm

Journal of Earth and Life Science

Yellow Perch Perca flavescens is a popular fish for harvesting in Minnesota. Because of this the Minnesota Department of Natural Resources survey populations with gill nets, however, some water bodies have Rusty Crayfish Faxonius rusticus that commonly consume most of the body leaving only the head to be accurately measured. The goal of this research was to see if there is a relationship between specific measurements of the head and the total length of the fish. The number of Yellow Perch sampled in this study was 72 and all came from Lake Bemidji in Minnesota during the month of October …

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Waterbody Size Predicts Bank- And Boat-Angler Efforts, Derek S. Kane, Kevin L. Pope, Keith D. Koupal, Mark A. Pegg, Christopher J. Chizinski, Mark A. Kaemingk Jul 2023

Waterbody Size Predicts Bank- And Boat-Angler Efforts, Derek S. Kane, Kevin L. Pope, Keith D. Koupal, Mark A. Pegg, Christopher J. Chizinski, Mark A. Kaemingk

Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications

Bank- and boat-angler efforts are logistically difficult and costly to estimate, preventing landscape-scale estimates that are required to address current and future challenges (e.g., climate change, invasive species) for inland recreational fisheries. Using a large Nebraska, USA, recreational fishery dataset (N = 67 waterbodies), we demonstrate that waterbody size can be used to predict bank- and boat-angler efforts across a heterogeneous landscape of extra small (< 104 ha) and large (> 647 ha) waterbodies. Bank and boat anglers respond to waterbody size, however these relationships appear to be unique between the two angler types. Boat-angler efforts increased as a function of waterbody size, whereas bank-angler …

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Acoustic Telemetry Provides Insights For Improving Conservation And Management At A Spawning Aggregation Site Of The Endangered Nassau Grouper (Epinephelus Striatus), Richard S. Nemeth, Elizabeth Kadison, Jonathan Jossart, Mahmood Shivji, Bradley Wetherbee, Jordan Matley Mar 2023

Acoustic Telemetry Provides Insights For Improving Conservation And Management At A Spawning Aggregation Site Of The Endangered Nassau Grouper (Epinephelus Striatus), Richard S. Nemeth, Elizabeth Kadison, Jonathan Jossart, Mahmood Shivji, Bradley Wetherbee, Jordan Matley

Biology Faculty Articles

Nassau grouper (Epinephelus striatus, Serranidae) were one of the most important fishery species in the Caribbean, but are now listed as critically endangered. Population collapse in most places occurred primarily by fishers targeting their spawning aggregation sites, where thousands of fish gathered during full moon periods from December to April. Identifying management options for protecting this vulnerable period is crucial for their survival. In the US Virgin Islands, we tagged 24 Nassau grouper with acoustic transmitters at a fish spawning aggregation (FSA) site called the Grammanik Bank, a 1.5 km2, marine protected area (MPA) closed each year from …

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Interactive Effects Of Climate Change-Induced Range Shifts And Wind Energy Development On Future Economic Conditions Of The Atlantic Surfclam Fishery, Stephanie Stromp, Andrew M. Scheld, John M. Klinck, Daphne M. Munroe, Eric N. Powell, Roger Mann, Sarah Borsetti, Eileen E. Hofmann Jan 2023

Interactive Effects Of Climate Change-Induced Range Shifts And Wind Energy Development On Future Economic Conditions Of The Atlantic Surfclam Fishery, Stephanie Stromp, Andrew M. Scheld, John M. Klinck, Daphne M. Munroe, Eric N. Powell, Roger Mann, Sarah Borsetti, Eileen E. Hofmann

CCPO Publications

Rising water temperatures along the northeastern U.S. continental shelf have resulted in an offshore range shift of the Atlantic surfclam Spisula solidissima to waters still occupied by ocean quahogs Arctica islandica. Fishers presently are prohibited from landing both Atlantic surfclams and ocean quahogs in the same catch, thus limiting fishing to locations where the target species can be sorted on deck. Wind energy development on and around the fishing grounds will further restrict the fishery. A spatially explicit model of the Atlantic surfclam fishery (Spatially Explicit Fishery Economics Simulator) has the ability to simulate the consequences of fishery displacement …

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Towards Structured Planning And Learning At The State Fisheries Agency Scale, Caleb A. Aldridge Dec 2022

Towards Structured Planning And Learning At The State Fisheries Agency Scale, Caleb A. Aldridge

Theses and Dissertations

Inland recreational fisheries has grown philosophically and scientifically to consider economic and sociopolitical aspects (non-biological) in addition to the biological. However, integrating biological and non-biological aspects of inland fisheries has been challenging. Thus, an opportunity exists to develop approaches and tools which operationalize planning and decision-making processes which include biological and non-biological aspects of a fishery. This dissertation expands the idea that a core set of goals and objectives is shared among and within inland fisheries agencies; that many routine operations of inland fisheries managers can be regimented or standardized; and the novel concept that current information and operations can …

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Recommendations For Establishing A Market For Invasive Green Crabs In New England, Eve Fischer, Jesse Minor, Marissa Mcmahan Oct 2022

Recommendations For Establishing A Market For Invasive Green Crabs In New England, Eve Fischer, Jesse Minor, Marissa Mcmahan

Student Scholarship

Green crabs are one of the most invasive marine species in the world. Their populations in New England have grown significantly due to climate change, increasing their environmental and socioeconomic impacts. Green crabs are voracious predators of soft shell clams, and have had a detrimental impact on the region’s valuable clam fisheries. They also prey on juvenile lobsters and other shellfish and compete with native crab species for resources. Green crabs burrow into and damage eelgrass beds, which are a vital habitat for many marine species and an important “blue carbon” sink. Due to their rapid rate of reproduction as …

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Fisheries Genomics Of Snapper (Chrysophrys Auratus) Along The West Australian Coast, Andrea Bertram, David Fairclough, Jonathan Sandoval-Castillo, Chris Brauer, Anthony Fowler, Maren Wellenreuther, Luciano B. Beheregaray Jun 2022

Fisheries Genomics Of Snapper (Chrysophrys Auratus) Along The West Australian Coast, Andrea Bertram, David Fairclough, Jonathan Sandoval-Castillo, Chris Brauer, Anthony Fowler, Maren Wellenreuther, Luciano B. Beheregaray

Fisheries Research Articles

The efficacy of fisheries management strategies depends on stock assessment and management actions being carried out at appropriate spatial scales. This requires understanding of spatial and temporal population structure and connectivity, which is challenging in weakly structured and highly connected marine populations. We carried out a population genomics study of the heavily exploited snapper (Chrysophrys auratus) along ~2600 km of the Australian coastline, with a focus on Western Australia (WA). We used 10,903 filtered SNPs in 341 individuals from eight sampling locations to characterize population structure and connectivity in snapper across WA and to assess if current spatial …

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Comparison Of Bigheaded Carp Reproduction In Tributaries Of The Illinois And Wabash Rivers, David J. Yff Jan 2022

Comparison Of Bigheaded Carp Reproduction In Tributaries Of The Illinois And Wabash Rivers, David J. Yff

Masters Theses

Understanding environmental conditions that support bigheaded carp (Hypophthalmichthys sp.) reproduction in tributary rivers provides key predictions of their invasion throughout the United States. Past research, primarily in larger order rivers, identified factors such as discharge, temperature, and turbidity as main environmental drivers of bigheaded carp reproduction. I used the variable hydrologic conditions between the Illinois and Wabash Rivers to compare environmental conditions between tributaries of each basin, determine which conditions influence bigheaded carp reproduction in tributaries, and predict tributaries likely to support bigheaded carp reproduction. Three tributaries of the Illinois and Wabash Rivers were sampled for ichthyoplankton from …

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Population Characteristics Of Three Black Bass Species In The Upper Ohio River Drainage, Levi Foster Brown Jan 2022

Population Characteristics Of Three Black Bass Species In The Upper Ohio River Drainage, Levi Foster Brown

Graduate Theses, Dissertations, and Problem Reports (ETD)

In West Virginia, species of black bass are economically and ecologically important and support popular fisheries. In the state’s large, navigable river systems, recent information suggests that anglers consider these fisheries diminished relative to their historic stocks. This study sought to describe the population characteristics of Largemouth, Smallmouth, and Spotted Bass in the upper Ohio River drainage and evaluate possible management actions. Low relative abundances coupled with poor growth estimates for Largemouth and Spotted Bass suggests that a suite of environmental and anthropogenic factors may be reducing the quality of their recreational fisheries. Conversely, demographic estimates produced for Smallmouth Bass …

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Overfishing Drives Over One-Third Of All Sharks And Rays Toward A Global Extinction Crisis, Nicholas K. Dulvy, Nathan Pacoureau, Cassandra L. Rigby, Riley A. Pollom, Rima W. Jabado, David A. Ebert, Brittany Finucci, Caroline M. Pollock, Jessica Cheok, Danielle H. Derrick, Katelyn B. Herman, C. Samantha Sherman, Wade J. Vanderwright, Julia M. Lawson, Rachel H.L. Walls, John K. Carlson, Patricia Charvet, Kinattumkara K. Bineesh, Daniel Fernando, Gina M. Ralph, Jay H. Matsushiba, Craig Hilton-Taylor, Sonja V. Fordham, Colin A. Simpfendorfer Nov 2021

Overfishing Drives Over One-Third Of All Sharks And Rays Toward A Global Extinction Crisis, Nicholas K. Dulvy, Nathan Pacoureau, Cassandra L. Rigby, Riley A. Pollom, Rima W. Jabado, David A. Ebert, Brittany Finucci, Caroline M. Pollock, Jessica Cheok, Danielle H. Derrick, Katelyn B. Herman, C. Samantha Sherman, Wade J. Vanderwright, Julia M. Lawson, Rachel H.L. Walls, John K. Carlson, Patricia Charvet, Kinattumkara K. Bineesh, Daniel Fernando, Gina M. Ralph, Jay H. Matsushiba, Craig Hilton-Taylor, Sonja V. Fordham, Colin A. Simpfendorfer

Biological Sciences Faculty Publications

The scale and drivers of marine biodiversity loss are being revealed by the International Union for Conservation of Nature (IUCN) Red List assessment process. We present the first global reassessment of 1,199 species in Class Chondrichthyes-sharks, rays, and chimeras. The first global assessment (in 2014) concluded that one-quarter (24%) of species were threatened. Now, 391 (32.6%) species are threatened with extinction. When this percentage of threat is applied to Data Deficient species, more than one-third (37.5%) of chondrichthyans are estimated to be threatened, with much of this change resulting from new information. Three species are Critically Endangered (Possibly Extinct), representing …

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Integrated Analyses Of Snp-Genotype And Environmental Data In A Continuously Distributed Snapper Species (Lutjanus Johnii, Bloch, 1792) Reveals A Mosaic Of Populations And A Challenge For Sustainable Management, Laura Taillebois, Danielle Davenport, Diane P. Barton, David Alexander Cook, Thor Saunders, Mark Hearnden, Richard J. Saunders, Stephen J. Newman, Michael J. Travers Oct 2021

Integrated Analyses Of Snp-Genotype And Environmental Data In A Continuously Distributed Snapper Species (Lutjanus Johnii, Bloch, 1792) Reveals A Mosaic Of Populations And A Challenge For Sustainable Management, Laura Taillebois, Danielle Davenport, Diane P. Barton, David Alexander Cook, Thor Saunders, Mark Hearnden, Richard J. Saunders, Stephen J. Newman, Michael J. Travers

Fisheries Research Articles

Understanding population structure is important for predicting the outcomes of anthropogenic development, harvest, and environmental change on the abundance of fisheries species. Logically, the use of several data sources is best for delineating population structure, but combining across data types adds extra challenges as results can be incongruent. Here, genetic and environmental markers were used to test hypotheses about population structure in a collection of 523 tropical inshore finfish (Lutjanus johnii) across northern Australia from 20 locations. Redundancy analyses (RDA) were used to statistically test for correlations among data sources providing a basis for reconciliation and insights into ecological and …

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Continental-Scale Network Reveals Cross-Jurisdictional Movements Of Sympatric Sharks With Implications For Assessment And Management, Charlie Huveneers, Yuri Niella, Michael Drew, Rory Mcauley, Paul A. Butcher, Victor Peddemors, Daniela Waltrick, Chris Dowling, Silas Mountford, Ian S. Keay, Matias Braccini Aug 2021

Continental-Scale Network Reveals Cross-Jurisdictional Movements Of Sympatric Sharks With Implications For Assessment And Management, Charlie Huveneers, Yuri Niella, Michael Drew, Rory Mcauley, Paul A. Butcher, Victor Peddemors, Daniela Waltrick, Chris Dowling, Silas Mountford, Ian S. Keay, Matias Braccini

Fisheries Research Articles

Understanding the movement ecology of marine species and connectivity of populations is required for effective fisheries management. This is especially the case for species with wide-ranging distributions for which movement can span across several jurisdictions with different management regulations. We used the Australian national network of acoustic receivers facilitated by the Integrated Marine Observing System (IMOS) to describe the extent and frequency of movements for two large epipelagic shark species, the bronze whaler (Carcharhinus brachyurus) and dusky shark (Carcharhinus obscurus). A total of 210 sharks (117 bronze whalers and 93 dusky sharks) were tracked for a …

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Evaluation Of Population Structure, Age, Growth, And Mortality Of Blue Catfish And Flathead Catfish Within The Robert C. Byrd Pool Of The Ohio And Kanawha Rivers, Joseph Vincent Siegel Jan 2021

Evaluation Of Population Structure, Age, Growth, And Mortality Of Blue Catfish And Flathead Catfish Within The Robert C. Byrd Pool Of The Ohio And Kanawha Rivers, Joseph Vincent Siegel

Graduate Theses, Dissertations, and Problem Reports (ETD)

The Ohio River is continuing to recover from a long history of anthropogenic impacts. Blue Catfish were considered locally extirpated from the West Virginia sections and have been reintroduced through fingerling stockings beginning in 2002. Flathead Catfish are naturally sustaining in the pool and combined with Blue Catfish provide two popular recreational fisheries. The Blue Catfish and Flathead Catfish studies shared similar objectives: (1) evaluating size structure, (2) estimating growth rates, and (3) estimating annual mortality. From 2017 to 2020, we collected catfish annually through low frequency electrofishing and trotline surveys at 10 fixed locations. Electrofishing catch rates for Blue …

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Modeling Early Life: Ontogenetic Growth And Behavior Affect Population Connectivity In Gulf Of Mexico Marine Fish, Kelly Vasbinder Nov 2020

Modeling Early Life: Ontogenetic Growth And Behavior Affect Population Connectivity In Gulf Of Mexico Marine Fish, Kelly Vasbinder

USF Tampa Graduate Theses and Dissertations

This dissertation is an examination of growth, behavior, and dispersal during the early life stages of marine fishes in the Gulf of Mexico. Understanding movements of early life stages is a key part of managing exploited fish populations. Position in the water column can impact larval dispersal, since it determines those currents to which larvae are exposed. First, I investigated the relationship between length and age in early life stages of marine fishes. I found that demersal fish taxa tend to be represented by exponential models, while pelagic fish tend to be represented by linear models. I suggest this may …

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