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Full-Text Articles in Life Sciences

Expanding Instream Flows To Protect Ecosystems In Overallocated River Basins, Belize A. Lane, David E. Rosenberg Oct 2018

Expanding Instream Flows To Protect Ecosystems In Overallocated River Basins, Belize A. Lane, David E. Rosenberg

Reports

Utahns are expressing a rapidly growing interest in protecting and enhancing instream flows for outdoor recreation and environmental benefits (Endter-Wada et al. 2015). However, many Utah rivers are already over-allocated for agricultural, municipal, hydropower and other water uses, making it difficult to procure additional water for instream flows. ‘Use it or lose it’ western water law and mentality encourages Utahns to use water rather than return it to rivers and ecosystems.

This briefing reviews existing instream flow practices allowed by the Utah water rights system and the challenges to implementation. We suggest key technical and legislative opportunities within and outside ...


Evaluating Recruitment Of American Eel, Anguilla Rostrata, In The Potomac River (Spring 2018), Troy D. Tuckey, Mary C. Fabrizio Sep 2018

Evaluating Recruitment Of American Eel, Anguilla Rostrata, In The Potomac River (Spring 2018), Troy D. Tuckey, Mary C. Fabrizio

Reports

No abstract provided.


2018 Annual Report Estimating Relative Juvenile Abundance Of Ecologically Important Finfish In The Virginia Portion Of Chesapeake Bay (1 July 2017 – 30 June 2018), Troy D. Tuckey, Mary C. Fabrizio Sep 2018

2018 Annual Report Estimating Relative Juvenile Abundance Of Ecologically Important Finfish In The Virginia Portion Of Chesapeake Bay (1 July 2017 – 30 June 2018), Troy D. Tuckey, Mary C. Fabrizio

Reports

EXECUTIVE SUMMARY

1 July 2017 – 30 June 2018

The Trawl Survey provides crucial data to state, regional, and national fisheries management agencies, including the Virginia Marine Resources Commission (VMRC), the Atlantic States Marine Fisheries Commission (ASMFC), the Mid-Atlantic Fisheries Management Council (MAFMC), and the National Marine Fisheries Service (NMFS). The MAFMC recognizes the juvenile trawl survey as one of the key predictors of Summer Flounder recruitment. Annual indices of juvenile abundance have been generated from trawl survey data for species of key recreational, ecological, and commercial importance in the Virginia portion of Chesapeake Bay. These include Spot, Atlantic Croaker, Weakfish ...


Virginia Shellfish Aquaculture Situation And Outlook Report: Results Of The 2017 Virginia Shellfish Aquaculture Crop Reporting Survey, Karen Hudson, Virginia Sea Grant Marine Advisory Program Jul 2018

Virginia Shellfish Aquaculture Situation And Outlook Report: Results Of The 2017 Virginia Shellfish Aquaculture Crop Reporting Survey, Karen Hudson, Virginia Sea Grant Marine Advisory Program

Reports

No abstract provided.


An Assessment Of Sea Scallop Abundance And Distribution In Georges Bank Closed Area Ii And The Southern Extension Closure: Final Report, David B. Rudders, Sally Roman May 2018

An Assessment Of Sea Scallop Abundance And Distribution In Georges Bank Closed Area Ii And The Southern Extension Closure: Final Report, David B. Rudders, Sally Roman

Reports

For the sea scallop, Placopecten magellanicus, the concepts of space and time have emerged as the basis of an effective management tool. The strategy of closing or limiting activities in certain areas for specific lengths of time has gained support as a method to conserve and enhance the scallop resource. In the last decade, rotational area management has provided a mechanism to protect juvenile scallops from fishing mortality by closing areas based upon scallop abundance and age distribution. Approximately half of the sea scallop industry’s current annual landings come from areas under this rotational harvest strategy. While this represents ...


A Cooperative High Precision Dredge Survey To Assess The Mid-Atlantic Sea Scallop Resource : Final Report, David B. Rudders, Sally Roman May 2018

A Cooperative High Precision Dredge Survey To Assess The Mid-Atlantic Sea Scallop Resource : Final Report, David B. Rudders, Sally Roman

Reports

For the sea scallop, Placopecten magellanicus, the concepts of space and time have emerged as the basis of an effective management tool. The strategy of closing or limiting activities in certain areas for specific lengths of time has gained support as a method to conserve and enhance the scallop resource. In the last decade, rotational area management has provided a mechanism to protect juvenile scallops from fishing mortality by closing areas based upon scallop abundance and age distribution. Approximately half of the sea scallop industry’s current annual landings come from areas under this rotational harvest strategy. While this represents ...


An Assessment Of Sea Scallop Abundance And Distribution In The Nantucket Lightship Closed Area And Surrounds: Final Report, David B. Rudders, Sally Roman May 2018

An Assessment Of Sea Scallop Abundance And Distribution In The Nantucket Lightship Closed Area And Surrounds: Final Report, David B. Rudders, Sally Roman

Reports

For the sea scallop, Placopecten magellanicus, the concepts of space and time have emerged as the basis of an effective management tool. The strategy of closing or limiting activities in certain areas for specific lengths of time has gained support as a method to conserve and enhance the scallop resource. In the last decade, rotational area management has provided a mechanism to protect juvenile scallops from fishing mortality by closing areas based upon scallop abundance and age distribution. Approximately half of the sea scallop industry’s current annual landings come from areas under this rotational harvest strategy. While this represents ...


Virginia Game Fish Tagging Program Annual Report 2017, Susanna Musick, Lewis Gillingham May 2018

Virginia Game Fish Tagging Program Annual Report 2017, Susanna Musick, Lewis Gillingham

Reports

Through 2017, the Virginia Game Fish Tagging Program (VGFTP) has maintained a 22-year database of rec-ords for tagged and recaptured fish. The program is a cooperative project of the Virginia Saltwater Fishing Tournament (VSFT) under the Virginia Marine Resources Commission-(VMRC) and the Virginia Institute of Marine Science (VIMS) of the College of William and Mary (under the VIMS Marine Advisory Program).


An Assessment Of Sea Scallop Abundance And Distribution In Georges Bank Closed Area Ii And Surrounds : Final Report, David B. Rudders, Sally Roman May 2018

An Assessment Of Sea Scallop Abundance And Distribution In Georges Bank Closed Area Ii And Surrounds : Final Report, David B. Rudders, Sally Roman

Reports

For the sea scallop, Placopecten magellanicus, the concepts of space and time have emerged as the basis of an effective management tool. The strategy of closing or limiting activities in certain areas for specific lengths of time has gained support as a method to conserve and enhance the scallop resource. In the last decade, rotational area management has provided a mechanism to protect juvenile scallops from fishing mortality by closing areas based upon scallop abundance and age distribution. Approximately half of the sea scallop industry’s current annual landings come from areas under this rotational harvest strategy. While this represents ...


Monitoring The Abundance Of American Shad And River Herring In Virginia's Rivers - 2017 Annual Report, Eric J. Hilton, Rob Latour, Patrick E. Mcgrath, Brian Watkins, Ashleigh Magee Apr 2018

Monitoring The Abundance Of American Shad And River Herring In Virginia's Rivers - 2017 Annual Report, Eric J. Hilton, Rob Latour, Patrick E. Mcgrath, Brian Watkins, Ashleigh Magee

Reports

This report describes the results of the twentieth year of a continuing study to estimate the relative abundance and assess the status of American shad (Alosa sapidissima) stocks in Virginia by monitoring the spawning runs in the James, York and Rappahannock rivers in spring 2017, evaluating hatchery programs, and contributing to coast-wide assessments (ASMFC 2007). We also report on two fishery-independent monitoring programs, one using staked gillnets in the Rappahannock River (year 2) and the other using anchor gillnets in the Chickahominy River (year 3; a major tributary of the James River),to determine relative abundance and stock structure for ...


The Status Of Virginia’S Public Oyster Resource 2017, Melissa Southworth, Roger Mann Apr 2018

The Status Of Virginia’S Public Oyster Resource 2017, Melissa Southworth, Roger Mann

Reports

This report summarizes data collected during 2016 in the Virginia portion of the Chesapeake Bay. The report is composed of two parts, part one, oyster recruitment (shell string) in Virginia and part two, dredge survey of selected oyster bars in Virginia


Estimating Relative Abundance Of Young‐Of‐Year American Eel, Anguilla Rostrata, In The Virginia Tributaries Of Chesapeake Bay (Spring 2017), Troy D. Tuckey, Mary C. Fabrizio Mar 2018

Estimating Relative Abundance Of Young‐Of‐Year American Eel, Anguilla Rostrata, In The Virginia Tributaries Of Chesapeake Bay (Spring 2017), Troy D. Tuckey, Mary C. Fabrizio

Reports

No abstract provided.


Virginia Seafood Sustainability, Robert A. Fisher Mar 2018

Virginia Seafood Sustainability, Robert A. Fisher

Reports

Virginia’s commercial fisheries operate sustainably under a suite of management tools based upon information received from marine scientists and fishery managers who regularly conduct biological sampling of fish while tracking commercial landings and other gathering of required information. Analyses of fishing effort and overall stock conditions, as well as formulas designed to calculate threshold limits for maintaining sustainable stocks are regularly performed. Restrictions on seasons, size, days at sea, and gear are imposed as needed to achieve management supporting long-term biological sustainability.


Estimation Of Juvenile Striped Bass Relative Abundance In The Virginia Portion Of Chesapeake Bay. 2017 Annual Report To The Virginia Marine Resources Commission, B. K. Gallagher, M. C. Fabrizio, T. D. Tuckey Jan 2018

Estimation Of Juvenile Striped Bass Relative Abundance In The Virginia Portion Of Chesapeake Bay. 2017 Annual Report To The Virginia Marine Resources Commission, B. K. Gallagher, M. C. Fabrizio, T. D. Tuckey

Reports

No abstract provided.


Evaluation Of Striped Bass Stocks In Virginia: Monitoring And Tagging Studies, 2015-2019 Progress Report, Philip W. Sadler, Lydia M. Goins, John M. Hoenig, Savannah Michaelsen, Maya L. Groner, Robert E. Harris Nov 2017

Evaluation Of Striped Bass Stocks In Virginia: Monitoring And Tagging Studies, 2015-2019 Progress Report, Philip W. Sadler, Lydia M. Goins, John M. Hoenig, Savannah Michaelsen, Maya L. Groner, Robert E. Harris

Reports

This report presents the results of striped bass (Morone saxatilis) tagging and monitoring activities in Virginia during the period 1 September 2016 through 31 August 2017. It includes an assessment of the biological characteristics of striped bass taken from the 2017 spring spawning run and estimates of annual survival and fishing mortality based on annual spring tagging. Also included is an investigation on the potential use of close-kin analyses to determine the size of the spawning stock in the Rappahannock River and an evaluation of mortality rates associated with the bacterial dermal disease mycobacteriosis in relation to water temperatures and ...


A Brief Guide To Striped Bass Ecology & Management In Chesapeake Bay, Mary C. Fabrizio, Troy D. Tuckey, Susanna Musick Nov 2017

A Brief Guide To Striped Bass Ecology & Management In Chesapeake Bay, Mary C. Fabrizio, Troy D. Tuckey, Susanna Musick

Reports

Chesapeake Bay striped bass support important recreational fisheries along the US Atlantic coast; in the late 1970s, the population of striped bass collapsed as a result of overfishing and poor water quality in rivers used for spawning and rear-ing of young. Informed by stock assessments, strict management regulations were enacted in the mid-1980s and early 1990s; these highly effective regulations resulted in the recovery of the population in 1995. A key to the successful recov-ery of the Atlantic coast striped bass was the wide range of ages of spawning females and the associated differences in spawning behavior among ages. Age ...


Northeast Area Monitoring And Assessment Program (Neamap)Data Collection And Analysis In Support Of Single And Multispecies Stockassessments In The Mid‐Atlantic: Northeast Area Monitoring Andassessment Program Near Shore Trawl Survey, Christopher F. Bonzek, James Gartland, Debra J. Gauthier, Robert J. Latour May 2017

Northeast Area Monitoring And Assessment Program (Neamap)Data Collection And Analysis In Support Of Single And Multispecies Stockassessments In The Mid‐Atlantic: Northeast Area Monitoring Andassessment Program Near Shore Trawl Survey, Christopher F. Bonzek, James Gartland, Debra J. Gauthier, Robert J. Latour

Reports

Concerns regarding the status of fishery‐independent data collection from continental shelf waters between Cape Hatteras, North Carolina and the U.S. / Canadian border led the Atlantic States Marine Fisheries Commission’s (ASMFC) Management and Science Committee (MSC) to draft a resolution in 1997 calling for the formation of the Northeast Area Monitoring and Assessment Program (NEAMAP) (ASMFC 2002). NEAMAP is a cooperative state‐federal program modeled after the Southeast Area Monitoring and Assessment Program (SEAMAP), which has been coordinating fishery‐independent data collection south of Cape Hatteras since the mid‐ 1980s (Rester 2001). The four main goals of this ...


Annual Report Data Collection And Analysis In Support Of Single And Multispecies Stock Assessments In Chesapeake Bay:The Chesapeake Bay Multispecies Monitoring And Assessment Program, Christopher F. Bonzek, James Gartland, Debra J. Gauthier, Robert J. Latour May 2017

Annual Report Data Collection And Analysis In Support Of Single And Multispecies Stock Assessments In Chesapeake Bay:The Chesapeake Bay Multispecies Monitoring And Assessment Program, Christopher F. Bonzek, James Gartland, Debra J. Gauthier, Robert J. Latour

Reports

Historically, fisheries management has been based on the results of single‐species stock assessment models that focus on the interplay between exploitation level and sustainability. There currently exists a suite of standard and accepted analytical frameworks (e.g., virtual population analysis (VPA), biomass dynamic production modeling, delay difference models, etc.) for assessing the stocks, projecting future stock size, evaluating recovery schedules and rebuilding strategies for overfished stocks, setting allowable catches, and estimating fishing mortality or exploitation rates. A variety of methods also exist to integrate the biological system and the fisheries resource system, thereby enabling the evaluation of alternative management ...


Virginia Shellfish Aquaculture Situation And Outlook Report : Results Of The 2016 Virginia Shellfish Aquaculture Crop Reporting Survey, Karen Hudson May 2017

Virginia Shellfish Aquaculture Situation And Outlook Report : Results Of The 2016 Virginia Shellfish Aquaculture Crop Reporting Survey, Karen Hudson

Reports

The hatchery-based shellfish aquaculture industry in Virginia continues to grow adding significant value to the Commonwealth's seafood marketplace. Today, watermen harvest both hard clams and oysters from the Commonwealth's public resources,albeit at rates diminished from historic levels. At the same time, Virginia's watermen-farmers, utilizing production from a land-based hatchery, are providing additional quantities of quality shellfish to consumers.

This survey, in its 11th year, is intended to continue annual assessments with which to gauge growth and inputs in Virginia's hatchery-based shellfish aquaculture industry. This report is based upon an industry survey completed during the first ...


Estimation Of Juvenile Striped Bass Relative Abundance In The Virginia Portion Of Chesapeake Bay: Annual Progress Report 2016-2017, Brian K. Gallagher, Mary C. Fabrizio, Troy D. Tuckey May 2017

Estimation Of Juvenile Striped Bass Relative Abundance In The Virginia Portion Of Chesapeake Bay: Annual Progress Report 2016-2017, Brian K. Gallagher, Mary C. Fabrizio, Troy D. Tuckey

Reports

The 2016 Striped Bass juvenile abundance index was 5.15 and was not significantly different from the reference mean of 7.77 observed in 1980-2009. Abundance indices in the James, York and Rappahannock rivers in 2016 were not significantly different than their historic averages (1967-2015). Juvenile White Perch abundance indices in 2016 were near historic averages in the York and Rappahannock rivers, but below the historic average in the James River. Because a new seine net was used during the 2016 survey, catches of Striped Bass and White Perch were adjusted using preliminary calibration factors derived from paired hauls of ...


Virginia Game Fish Tagging Program Annual Report 2016, Susanna Musick, Lewis Gillingham May 2017

Virginia Game Fish Tagging Program Annual Report 2016, Susanna Musick, Lewis Gillingham

Reports

Through 2016, the Virginia Game Fish Tagging Program (VGFTP) has maintained a 21-year database of records for tagged and recaptured fish. The program is a cooperative project of the Virginia Saltwater Fishing Tournament (VSFT) under the Virginia Marine Resources Commission-(VMRC) and the Virginia Institute of Marine Science (VIMS) of the College of William and Mary (under the VIMS Marine Advisory Program).


Monitoring The Abundance Of American Shad And River Herring In Virginia's Rivers - 2016 Annual Report, Eric J. Hilton, Rob Latour, Patrick Mcgrath, Brian Watkins, Ashleigh Magee Apr 2017

Monitoring The Abundance Of American Shad And River Herring In Virginia's Rivers - 2016 Annual Report, Eric J. Hilton, Rob Latour, Patrick Mcgrath, Brian Watkins, Ashleigh Magee

Reports

This report describes the results of the nineteenth year of a continuing study to estimate the relative abundance and assess the status of American shad (Alosa sapidissima) stocks in Virginia by monitoring the spawning runs in the James, York and Rappahannock rivers in spring 2016, evaluating hatchery programs, and contributing to coast-wide assessments (ASMFC 2007). We also report on a new fishery-independent monitoring program using staked gillnets to determine relative abundance and stock structure for the adult spawning run of river herring (A. pseudoharengus, and A. aestivalis) in the Rappahannock River. Data are also reported from two separate fishery-independent monitoring ...


Kepone In The James River Estuary: Past, Current And Future Trends, Michael A. Unger, George G. Vadas Apr 2017

Kepone In The James River Estuary: Past, Current And Future Trends, Michael A. Unger, George G. Vadas

Reports

In late 1975, a manufacturing facility in Hopewell, VA had not only exposed workers to the chlorinated pesticide, Kepone, but had also severely contaminated the James River estuary. To assess the potential risk to the public, Virginia initiated a finfish-monitoring program in late 1975. Over the next 40 years over 13,000 samples were collected from the James River and Chesapeake Bay and analyzed for Kepone. Kepone production was eventually banned worldwide. The average Kepone concentrations found in most species began falling when the production of Kepone ended, but the averages remained over the action limit of 0.3 mgkg ...


Tracking Decadal Changes In Striped Bass Recruitment: A Calibration Study Of Seine Surveys In Chesapeake Bay, Mary C. Fabrizio, Troy D. Tuckey, Olivia M. Philips, Brian K. Gallagher Mar 2017

Tracking Decadal Changes In Striped Bass Recruitment: A Calibration Study Of Seine Surveys In Chesapeake Bay, Mary C. Fabrizio, Troy D. Tuckey, Olivia M. Philips, Brian K. Gallagher

Reports

In this study we estimated calibration factors necessary to maintain the long‐term integrity of the juvenile striped bass surveys in the Chesapeake Bay region. These surveys provide annual indices of recruitment (estimated as juvenile fish abundance in summer) and are used by fisheries managers in Virginia and Maryland to inform adjustments of annual harvest limits for striped bass from the commercial and recreational fisheries in Chesapeake Bay. During the multi‐decadal history of the survey, a potentially influential change occurred: VIMS deployed a net (the VA net) with a mesh material that differed from the standard net that MD ...


Temperature Selectivity And Movement Patterns Of Speckled Trout, Patrick E. Mcgrath, Eric J. Hilton Mar 2017

Temperature Selectivity And Movement Patterns Of Speckled Trout, Patrick E. Mcgrath, Eric J. Hilton

Reports

Speckled trout (Cynoscion nebulosus) is the focus of an important recreational fishery in the southeastern United States. Speckled trout in Virginia has been cited as both a transitional population and as a mostly non-migratory population. The degree of residency is important to understand for the effective management of the species. Management of speckled trout has also been marred by cold-stun events which can kill a significant portion of the stock and have detrimental localized effects. Virginia is the northern extent of speckled trout populations and is the most likely portion of its range to experience cold-stun events. Virginia water temperatures ...


Estimating Relative Abundance Of Young-Of-The-Year American Eel, Anguilla Rostrata, In The Virginia Tributaries Of Chesapeake Bay, Spring 2016, Mary C. Fabrizio, Troy D. Tuckey Mar 2017

Estimating Relative Abundance Of Young-Of-The-Year American Eel, Anguilla Rostrata, In The Virginia Tributaries Of Chesapeake Bay, Spring 2016, Mary C. Fabrizio, Troy D. Tuckey

Reports

American Eel (Anguilla rostrata) is a valuable commercial species along the Atlantic coast of North America from New Brunswick to Florida. In the U.S., harvests have declined, with similar patterns occurring in the Canadian Maritime Provinces (Meister and Flagg 1997). An average of 62% of the annual landings of U.S. commercial harvest since 1993 have come from the Chesapeake Bay (personal communication from the National Marine Fisheries Service, Fisheries Statistics Division, 9 February 2015). In 2013, Virginia commercial landings were approximately 100,298 lbs; since mandatory reporting began in 1993, average annual landings in Virginia have been 193 ...


Counting Blue Crabs In The Bay! Subjects: Life Science / Biology, Environmental Science, Marine / Ocean Science Grade Level: 6-8, Bruce W. Pfirrmann Jan 2017

Counting Blue Crabs In The Bay! Subjects: Life Science / Biology, Environmental Science, Marine / Ocean Science Grade Level: 6-8, Bruce W. Pfirrmann

Reports

This lesson plan invites students and teachers to ponder the question: How many blue crabs are in the Chesapeake Bay, and where do we find them? Through hands-on activities and the use of real data, students will discover the excitement and grapple with the challenges faced by marine scientists as they try to quantify the use of different habitats by marine animals and estimate the size of marine animal populations.


Seagrass Survivor Subjects: Life Science / Biology, Environmental Science, Marine / Ocean Science Grades: 6-8, Amanda Bromilow Jan 2017

Seagrass Survivor Subjects: Life Science / Biology, Environmental Science, Marine / Ocean Science Grades: 6-8, Amanda Bromilow

Reports

This role-play and decision-making game allows students to simulate predator-prey interactions between fish and blue crabs in a seagrass bed. Students will then make inferences about the influence of habitat and body size on juvenile blue crab survival.


Microscopic Hitchhiking: Taking A Trip With Microbes And Plankton Subjects: Life Science / Biology, Environmental Science, Marine / Ocean Science Grades: 6-8, Lucia Safi Jan 2017

Microscopic Hitchhiking: Taking A Trip With Microbes And Plankton Subjects: Life Science / Biology, Environmental Science, Marine / Ocean Science Grades: 6-8, Lucia Safi

Reports

This lesson plan develops concepts on food webs and ecological relationships, giving special attention to microorganisms and Chesapeake Bay species and dynamics. Students will conduct investigations, generate their own data and find out more about species they constantly see!


Wonderful Wetlands: Why Do We Need Them And What Can They Do For Us? Subjects: Environmental Science, Marine/Ocean Science, Life Science/Biology Grades: 9-12, Amanda Knobloch Jan 2017

Wonderful Wetlands: Why Do We Need Them And What Can They Do For Us? Subjects: Environmental Science, Marine/Ocean Science, Life Science/Biology Grades: 9-12, Amanda Knobloch

Reports

This lesson plan introduces students to a variety of different types of wetlands and how they function in the coastal environment. Students will work through activities that illustrate the economic importance of wetlands and the services wetlands provide, as well as building conceptual models of wetlands to illustrate these points.