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Articles 31 - 60 of 125
Full-Text Articles in Life Sciences
An Assessment Of Sea Scallop Abundance And Distribution In The Georges Bank Closed Area Ii, William D. Dupaul, David Rudders
An Assessment Of Sea Scallop Abundance And Distribution In The Georges Bank Closed Area Ii, William D. Dupaul, David Rudders
Reports
No abstract provided.
Sampling A Littoral Fish Assemblage: Comparison Of Small-Mesh Fyke Netting And Boat Electrofishing, Carl R. Ruetz Iii, Donald G. Uzarski, Damon M. Krueger, Edward S. Rutherford
Sampling A Littoral Fish Assemblage: Comparison Of Small-Mesh Fyke Netting And Boat Electrofishing, Carl R. Ruetz Iii, Donald G. Uzarski, Damon M. Krueger, Edward S. Rutherford
Peer-reviewed scientific publications
We compared small-mesh (4-mm) fyke netting and boat electrofishing for sampling a littoral fish assemblage in Muskegon Lake, Michigan. We hypothesized that fyke netting selects for small-bodied fishes and electrofishing selects for large-bodied fishes. Three sites were sampled during May (2004 and 2005), July (2005 only), and September (2004 and 2005). We found that the species composition of captured fish differed considerably between fyke netting and electrofishing based on nonmetric multidimensional scaling (NMDS). Species strongly associated with fyke netting (based on NMDS and relative abundance) included the brook silverside Labidesthes sicculus, banded killifish Fundulus diaphanus, round goby Neogobius melanostomus, mimic …
Marine Resource Bulletin Vol. 39, No. 2, Virginia Sea Grant, Virginia Institute Of Marine Science
Marine Resource Bulletin Vol. 39, No. 2, Virginia Sea Grant, Virginia Institute Of Marine Science
Virginia Marine Resource Bulletin
In This Issue
The Fish that Saved Jamestown 2
This year, America celebrated the 400th anniversary of the founding of Jamestown. However, one crucial player in the Jamestown story may have been forgotten amid all the festivities - the Atlantic sturgeon - the "fish that saved Jamestown." Erin Seiling pulls together historic artifacts and notes that detail how important the species was to the colony.
State of the Sturgeon 6
As a species, Atlantic sturgeon are millions of years old, but much is still unknown about these ancient fish. Researchers at Virginia Sea Grant and the Virginia Institute of Marine …
The Lobster Bulletin, Summer 2007, Lobster Institute, University Of Maine
The Lobster Bulletin, Summer 2007, Lobster Institute, University Of Maine
Lobster Bulletin
The Lobster Bulletin newsletter includes research updates, and information on lobsters and the lobster industry. The Lobster Institute at the University of Maine is dedicated to protecting and conserving the lobster resource, and enhancing lobstering as an industry and a way of life.
Headlines in the Summer 2007 issue include:
- Long Island Sound Lobstermen Establish Fund to Support the Lobster Institute
- Twenty Years of Service
- Lobster Institute to Benefit from a Bequest to Establish a Product Development Fund
- Alternative Lobster Bait Moves Out of the Lab and Into the Marketplace
- Research Report: Medicated Feed Trials Conducted
- The Lobster Institute Celebrates …
Improvement And Evaluation Of Greenlip Abalone Hatchery And Nursery Production. Final Frdc Report - Project 2003/203, Sabine Daume
Improvement And Evaluation Of Greenlip Abalone Hatchery And Nursery Production. Final Frdc Report - Project 2003/203, Sabine Daume
Fisheries research contract reports
A range of experiments aimed at optimizing broodstock performance and nursery culture of greenlip abalone (Haliotis laevigata) were undertaken in Western Australia. Factors investigated that can potentially influence broodstock performance were natal source (wild-caught or farm-grown) and broodstock diets (red algal diet or formulated diet varying in levels of an important fatty acid). Wild-caught broodstock, feeding mainly on a red seaweed diet, produced eggs with higher concentrations of an important fatty acid, arachidonic acid, whereas farm-grown broodstock, feeding on a commercial formulated diet, altered the concentration of fatty acids of the eggs. Feeding farm-grown broodstock natural diets like …
An Assessment Of Sea Scallop Abundance And Distribution In The Georges Bank Closed Area Ii - Preliminary Results, William D. Dupaul, David Rudders
An Assessment Of Sea Scallop Abundance And Distribution In The Georges Bank Closed Area Ii - Preliminary Results, William D. Dupaul, David Rudders
Reports
No abstract provided.
Detection Of Panulirus Argus Virus 1 In Caribbean Spiny Lobsters, Megan M. Montgomery-Fullerton, Roland Cooper, Kathryn M. Kauffman, Jeffrey D. Shields, Robert E. Ratzlaff
Detection Of Panulirus Argus Virus 1 In Caribbean Spiny Lobsters, Megan M. Montgomery-Fullerton, Roland Cooper, Kathryn M. Kauffman, Jeffrey D. Shields, Robert E. Ratzlaff
Collected Faculty and Staff Scholarship
Panulirus argus Virus 1 (PaV1) is a pathogenic virus that infects Caribbean spiny lobsters P. argus in the Florida Keys. We have developed a PCR detection assay for PaV1 for the purpose of studying the natural history of the virus and for monitoring the prevalence of infection. The detection of the virus in hemolymph and other tissues is based on the PCR amplification of a 499 bp product using specific primers designed from a cloned fragment of the PaV1 genome. The sensitivity limit for the assay was 1.2 fg of purified viral DNA. The PaV1 primers did not react with …
Physical Properties Of Extrudates Containing Distillers Grains Extruded In A Twin Screw Extruder, Nehru Chevanan, Kurt A. Rosentrater, Kasiviswanathan Muthukumarappan
Physical Properties Of Extrudates Containing Distillers Grains Extruded In A Twin Screw Extruder, Nehru Chevanan, Kurt A. Rosentrater, Kasiviswanathan Muthukumarappan
Kurt A. Rosentrater
Extrusion trials were conducted with varying levels of DDGS along with soy flour, corn flour, fish meal, vitamin mix, mineral mix and net protein content adjusted to 28% in a Wenger TX-52 twin screw extruder. The properties of extrudates obtained with experiments conducted in full factorial design with 3 levels of DDGS content, 2 levels of moisture content and 2 levels of screw speed were studied. Increasing the DDGS content from 20% to 60%, resulted in 36.7% decrease in the radial expansion leading to 159%, 61.4% increase in the unit density and bulk density of the extrudates. Increasing the DDGS …
Effect Of Die Dimensions On Extrusion Processing Parameters And Properties Of Ddgs-Based Aquaculture Feeds, Nehru Chevanan, Kasiviswanathan Muthukumarappan, Kurt A. Rosentrater, James L. Julson
Effect Of Die Dimensions On Extrusion Processing Parameters And Properties Of Ddgs-Based Aquaculture Feeds, Nehru Chevanan, Kasiviswanathan Muthukumarappan, Kurt A. Rosentrater, James L. Julson
Kurt A. Rosentrater
The goal of this study was to investigate the effect of die nozzle dimensions, barrel temperature profile, and moisture content on DDGS-based extrudate properties and extruder processing parameters. An ingredient blend containing 40% distillers dried grains with solubles (DDGS), along with soy flour, corn flour, fish meal, whey, mineral and vitamin mix, with a net protein content adjusted to 28% was extruded in a single-screw laboratory extruder using seven different die nozzles. Increasing moisture content of the ingredient mix from 15 to 25% resulted in a 2.0, 16.0, 16.3, 22.9, 18.5, 32.5, and 63.7% decrease, respectively, in bulk density, water-solubility …
Ecosystem Services Related To Oyster Restoration, Ld Coen, Rochelle Brumbaugh, D Bushek, R Grizzle, Mark Luckenbach, Et Al
Ecosystem Services Related To Oyster Restoration, Ld Coen, Rochelle Brumbaugh, D Bushek, R Grizzle, Mark Luckenbach, Et Al
VIMS Articles
The importance of restoring filter-feeders, such as the Eastern oyster Crassostrea virginica, to mitigate the effects of eutrophication (e.g. in Chesapeake Bay) is currently under debate. The argument that bivalve molluscs alone cannot control phytoplankton blooms and reduce hypoxia oversimplifies a more complex issue, namely that ecosystem engineering species make manifold contributions to ecosystem services. Although further discussion and research leading to a more complete understanding is required, oysters and other molluscs (e.g. mussels) in estuarine ecosystems provide services far beyond the mere top-down control of phytoplankton blooms, such as (1) seston filtration, (2) benthic–pelagic coupling, (3) creation of refugia …
Annual Progress Report - 2006 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, Robert J. Latour, James Gartland
Annual Progress Report - 2006 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, Robert J. Latour, James Gartland
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 strategies on …
Virginia Shellfish Aquaculture Situation And Outlook Report : Results Of The 2005-2007 Virginia Shellfish Aquaculture Crop Reporting Survey, Thomas J. Murray, Michael J. Oesterling
Virginia Shellfish Aquaculture Situation And Outlook Report : Results Of The 2005-2007 Virginia Shellfish Aquaculture Crop Reporting Survey, Thomas J. Murray, Michael J. Oesterling
Reports
Continued growth of the shellfish aquaculture industry in Virginia has added significant value to the state’s seafood marketplace. Today, watermen continue to harvest both hard clams and oysters from the state’s public resources, albeit at diminished rates. At the same time, Virginia’s watermen-farmers are providing growing quantities of additional quality shellfish to consumers. Following the lead of the hard clam industry, there has been a significant transition to intensive aquaculture of native oysters in recent years. The once extensive oyster planting has disappeared primarily as a result of endemic oyster diseases and increasing wildlife predation of seed oysters. In its …
Conference Proceedings Water Access 2007: A National Symposium On Working Waterways & Waterfronts, Virginia Sea Grant
Conference Proceedings Water Access 2007: A National Symposium On Working Waterways & Waterfronts, Virginia Sea Grant
Reports
No abstract provided.
Outcomes Of The Wetline Review. The Minister For Fisheries’ Decisions In Relation To The Future Management Of The West Coast And Gascoyne Commercial “Wetline” Fisheries, Department Of Fisheries Western Australia.
Outcomes Of The Wetline Review. The Minister For Fisheries’ Decisions In Relation To The Future Management Of The West Coast And Gascoyne Commercial “Wetline” Fisheries, Department Of Fisheries Western Australia.
Fisheries management papers
This document details my final decisions on the new management arrangements for the West Coast and Gascoyne commercial ‘wetline’ fisheries. The decisions that are set out in this document will form an important part of the holistic management package required to ensure the long-term sustainability of our demersal scalefish resources in the West Coast and Gascoyne bioregions. The new Management Plans will provide the framework within which commercial scalefish catches can be explicitly managed to sustainable levels and will promote greater commercial certainty and confidence for those operators who gain access to the fishery.
Mechanics Of Suction Generation During Feeding In Little Skates, Danielle Duquette
Mechanics Of Suction Generation During Feeding In Little Skates, Danielle Duquette
Senior Honors Projects
Feeding mechanisms of aquatic vertebrates has been extensively studied in the past, while that of elasmobranchs remains limited. Skates and rays are believed to have evolved from a shark ancestor, thus they represent the most derived group. All skates are dorsoventrally compressed, have a unique jaw suspension type and head skeleton and live in benthic environments. It is unknown whether these derived features of skates have altered the ancestral shark feeding mechanism. Comparing feeding mechanisms in skates and sharks may shed light on morphological transformations that have arisen after the evolutionary split of these two groups. In this study prey …
Spawning Chronology Of Native And Introduced Striped Bass (Morone Saxatilis) In Two Gulf Of Mexico Drainages, Matthew Noad
Spawning Chronology Of Native And Introduced Striped Bass (Morone Saxatilis) In Two Gulf Of Mexico Drainages, Matthew Noad
All Theses
In this study, I investigated the potential for temperature to serve as a mechanism for maintenance of reproductive isolation in a sympatric population of Atlantic and Gulf striped bass in the Apalachicola and Ochlockonee rivers, Florida. Adult striped bass (n= 66, mean weight = 8.3 kg, mean total length = 780.6 mm) were collected from February to May below Jim Woodruff Lock and Dam, on the Apalachicola River, and below Jackson Bluff Lock on the Ochlockonee River, Florida. Ancestry (Gulf or Atlantic) of specimens was determined based upon the methods of Wirgin et al. (2005) using three diagnostic microsatellite loci: …
Fecundity And Survival Of The Calanoid Copepod Acartia Tonsa Fed Isochrysis Galeana (Tahitian Strain) And Chaetoceros Mulleri, Angelos Apeitos
Fecundity And Survival Of The Calanoid Copepod Acartia Tonsa Fed Isochrysis Galeana (Tahitian Strain) And Chaetoceros Mulleri, Angelos Apeitos
Master's Theses
Historically, red snapper (Lutjanus campechanus) larviculture at the Gulf Coast Research Lab (GCRL) used 25 ppt artificial salt water and mixed, wild zooplankton composed primarily of Acartia tonsa, a calanoid copepod. Acartia tonsa was collected from the estuarine waters of Davis Bayou and bloomed in outdoor tanks from which it was harvested and fed to red snapper larvae. We are developing a more controlled copepod mass culture system to support finfish larviculture. To that end, I examined the effect of single species versus mixed species of algae as food for the copepods. Wild A. tonsa were isolated and reared in …
Report And Recommendations Of The Blue Ribbon Oyster Panel, Blue Ribbon Oyster Panel
Report And Recommendations Of The Blue Ribbon Oyster Panel, Blue Ribbon Oyster Panel
Reports
The maps are generated to illustrate the results of the targeting effort following the protocol described above. The authors recognize this level of targeting does not preclude the need for field inspection at potential sites prior to reef construction. The atlas is comprised of a series of boxes preceded by an index locator. The scale of each box may vary. The potential restoration areas are illustrated in red. The legend reports the total acres available for restoration within the boundary of each box. At this time, the size of individual restoration sites can only be retrieved using the digital data …
Population Size And Passage Efficiency Of Alabama Shad Reaching Jim Woodruff Lock And Dam, Patrick Ely
Population Size And Passage Efficiency Of Alabama Shad Reaching Jim Woodruff Lock And Dam, Patrick Ely
All Theses
In this study, I estimated the population size of migrating Alabama shad below Jim Woodruff Lock and Dam (JWLD) in the Apalachicola River located in the central panhandle of Northwest Florida using mark recapture and relative abundance techniques. The number of marked fish was adjusted for tag loss, emigration and mortality. The population size of migrating Alabama shad near JWLD was estimated at 26,029 (95% C.I. = 15,174 - 49,040) in 2005 and as 972 (95% C.I. = 270 - 9,720) in 2006. Due to the small sample size, a relative abundance method was used to independently estimate a population …
Age, Growth, And Fecundity Of Alabama Shad (Alosa Alabamae) In The Apalachicola River, Florida , Travis Ingram
Age, Growth, And Fecundity Of Alabama Shad (Alosa Alabamae) In The Apalachicola River, Florida , Travis Ingram
All Theses
Age and growth of Alabama shad Alosa Alabamae were estimated by examining scales and otoliths from 203 adult fish collected on their spawning run in the upper Apalachicola River from 2005 and 2006. Ages of Alabama shad ranged from 1 - 4 years. Scales and otoliths both gave similar age estimates. Age distributions from this study differed from those of previous studies for both males and females. Female Alabama shad, on average, were found to be larger than males at age 2 and age 3. Alabama shad demonstrated a positive correlation of length to fecundity, with fecundity estimates ranging from …
Captive Propagation Of Tangerine Darters For Re-Introduction In The Pigeon River, Tennessee, Craig Lee Phillips
Captive Propagation Of Tangerine Darters For Re-Introduction In The Pigeon River, Tennessee, Craig Lee Phillips
Masters Theses
The Pigeon River suffered major water quality degradation from 1908 through the 1980’s from paper mill effluent which resulted in the extirpation of many native fish species. Mill modifications have cleaned the effluent to the degree where some native species are recolonizing many areas of the river. In 2001, the Pigeon River Restoration Project was initiated to re-introduce native non-game species which have been unable to return of their own accord. In addition to relocation of selected suitable species, captive production of the tangerine darter (Percina aurantiaca) has been attempted since current translocation methods have proven impractical due …
Effects Of Oyster Population Restoration Strategies On Phytoplankton Biomass In Chesapeake Bay: A Flexible Modeling Approach, Rs Fulford, Dl Brietburg, Rie Newell, Wm Kemp, Mw Luckenbach
Effects Of Oyster Population Restoration Strategies On Phytoplankton Biomass In Chesapeake Bay: A Flexible Modeling Approach, Rs Fulford, Dl Brietburg, Rie Newell, Wm Kemp, Mw Luckenbach
VIMS Articles
Cultural eutrophication in estuaries and other coastal systems has increased over the last 50 yr. Some recently proposed strategies to reverse this trend have included the restoration of bivalve suspension feeders as an ecological tool for reducing phytoplankton biomass. The ecological benefits accruing from such bivalve restoration will be dependent on the characteristics of the estuary, as well as how restoration is implemented. We developed a filtration model to estimate the effect of bivalve restoration on the rate of phytoplankton removal over a range of spatial and temporal scales and used it to compare alternate restoration strategies for the eastern …
Reproductive Cycles Of The Pearl Oysters, Pinctada Fucata (Gould) And Pinctada Margaritifera (Linnaeus) (Bivalvia: Pteriidae) In Southwestern Taiwan Waters, Jiuan-Jiuan Hwang
Reproductive Cycles Of The Pearl Oysters, Pinctada Fucata (Gould) And Pinctada Margaritifera (Linnaeus) (Bivalvia: Pteriidae) In Southwestern Taiwan Waters, Jiuan-Jiuan Hwang
Journal of Marine Science and Technology
The reproductive cycles of the pearl oysters Pinctada fucata (Gould) and Pinctada margaritifera (Linnaeus) were examined based on 339 and 284 specimens, collected in southwestern Taiwan. Except for the month of December 2002, Pinctada fucata were collected during the periods from March 2002 to September 2003. Pinctada margaritifera were collected over two periods: from March 2002 to November 2002 and from June 2003 to September 2003. Histological observations on gonadal development indicated that Pinctada fucata and Pinctada margaritifera were protandrous hermaphrodites, and both species exhibited different annual cyclical patterns, in which maturity peaked in May and October for Pinctada fucata, …
Gymnothorax Shaoi, A New Species Of Moray Eel (Anguilliformes: Muraenidae) From Southeastern Taiwan, Hong-Ming Chen, Kar-Hoe Loh
Gymnothorax Shaoi, A New Species Of Moray Eel (Anguilliformes: Muraenidae) From Southeastern Taiwan, Hong-Ming Chen, Kar-Hoe Loh
Journal of Marine Science and Technology
A new species of moray eel, Gymnothorax shaoi, is described here based on ten specimens collected in southeastern Taiwan. The new muraenid is distinct from its most similar species, Gymnothorax fimbriatus, in the character combinations of having brown body color, dark brown spots in at least three rows on body side and spots on posterior dorsal and caudal fin not forming oblique streaks; paler rictus, jaws, and inner mouth; fins without pale margins; no bend in lower jaw; fewer total vertebrae; and smaller in maximum body size. G. shaoi’s eyes have yellow to orange irises, body with dark reddish brown …
Monitoring Relative Abundance Of American Shad In Virginia Rivers 2006 Annual Report, John E. Olney, Kristen Delano Walter
Monitoring Relative Abundance Of American Shad In Virginia Rivers 2006 Annual Report, John E. Olney, Kristen Delano Walter
Reports
Concern about the decline in landings of American shad (Alosa sapidissima) along the Atlantic coast prompted the development of an interstate fisheries management plan (FMP) under the auspices of the Atlantic States Marine Fisheries Management Program (ASMFC 1999). Legislation enables imposition of federal sanctions on fishing in those states that fail to comply with the FMP. To be in compliance, coastal states are required to implement and maintain fishery-dependent and fishery-independent monitoring programs as specified by the FMP. For Virginia, these requirements include spawning stock assessments, the collection of biological data on the spawning run (e.g., age-structure, sex ratio, and …
The Lobster Bulletin, Spring 2007, Lobster Institute, University Of Maine
The Lobster Bulletin, Spring 2007, Lobster Institute, University Of Maine
Lobster Bulletin
The Lobster Bulletin newsletter includes research updates, and information on lobsters and the lobster industry. The Lobster Institute at the University of Maine is dedicated to protecting and conserving the lobster resource, and enhancing lobstering as an industry and a way of life.
Headlines in the Spring 2007 issue include:
- 2007 Canadian/U.S. Lobstermen's Town Meeting
- Lobster Prices Elevated as Water Temperatures Remained Low
- Research Report: Tidal Lobster Pounds to be Tested as Lobster Rearing Facilities
- Research Report: Hatchery Project Also Underway in Cornwall, England
- The Lobster Institute Celebrates Its 20th Anniversary: 1987-2007
A Sustainable Future For Fishing On Christmas Island. A Draft Five-Year Strategy For Managing Commercial, Recreational And Charter Fishing., Department Of Fisheries Western Australia.
A Sustainable Future For Fishing On Christmas Island. A Draft Five-Year Strategy For Managing Commercial, Recreational And Charter Fishing., Department Of Fisheries Western Australia.
Fisheries management papers
This draft strategy was developed by the Department of Fisheries, Western Australia, hereafter known as the “Department of Fisheries” which has responsibility for managing fish resources (within Territorial waters out to 12 nautical miles) on behalf of the Commonwealth Department of Transport and Regional Services (DoTARS), through the applied Fish Resources Management Act (FRMA) (WA)(CI) (the “Applied Act”). The Applied Act provides a legislative framework that allows for management arrangements to be developed specifically for Christmas Island. The management of fisheries in Western Australia uses an adaptive approach which balances the need for the effective management of fish stocks with …
Shark Bay Prawn And Scallop Fisheries. Draft Review Report, Department Of Fisheries Western Australia
Shark Bay Prawn And Scallop Fisheries. Draft Review Report, Department Of Fisheries Western Australia
Fisheries management papers
In recent times, the Department of Fisheries has received representations from both sectors about the ongoing interaction of the fisheries and their respective management settings. As a result, a decision was made to comprehensively review the fisheries, taking into account matters of fishery sustainability and gear interactions, together with industry economics and market considerations. The review has also addressed research requirements to ensure an appropriate scientific basis for decision-making into the future.
Extensions Of Local Domains With Trivial Generic Fiber, William Heinzer, Christel Rotthaus, Sylvia Wiegand
Extensions Of Local Domains With Trivial Generic Fiber, William Heinzer, Christel Rotthaus, Sylvia Wiegand
Nebraska Cooperative Fish and Wildlife Research Unit: Staff Publications
We consider injective local maps from a local domain R to a local domain S such that the generic fiber of the inclusion map R -> S is trivial, that is P R (0) for every nonzero prime ideal P of S. We present several examples of injective local maps involving power series that have or fail to have this property. For an extension R -> S having this property, we give some results on the dimension of S; in some cases we show dim S = 2 and in some cases dim S = 1.
National Wildlife Refuge System: Friends Forward (Spring 2007)
National Wildlife Refuge System: Friends Forward (Spring 2007)
United States Fish and Wildlife: Staff Publications
Contents:
Design Concepts Bring Down Costs
“America the Beautiful Interagency Pass” Is Key to Refuge Travel
From the Chief: Refuges are Great!
Reading Rachel Carson
National Honors Bestowed on Friends Group and Volunteer
Friends Support Florida’s Winter Whooping Cranes
Walk on Winn Dixie: A Monthly Promenade
Writing a Newsletter? Here Are Some Tips
Noxubee Friends Advertise Refuge on Free Billboard
Glacier Activity at Togiak National Wildlife Refuge
Frequently Asked Questions
Calendar of Friends and National Events