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Progress Reports For Investigation Of The Impact Of A Major Flood On The Fisheries Resources And Environments Of The Chesapeake Bay : For The Period September 1, 1972 - June 30, 1973, Virginia Institute Of Marine Science

Reports

• I. Effects of adult blue crabs and blue crab larvae [Activities related to Tropical Storm Agnes, Crustaceology Dept. / W.A. Van Engel --
• II. Effects on the plankton community [Plankton of the lower Chesapeake Bay, summer 1972] / G.C. Grant, R. Rhodes, J.E. Warinner, P.L. Zubkoff. --
• III. Influences on adult fish [James, York and Rappahannock River trawl survey, Agnes Flood, June 28-July 3, 1972; Follow-up, Aug. 8-Sept. 7, 1972] / W. Wilson; Hurricane Agnes, finfish investigations up to Sept. 7 , 1972 / W. Hoagman --
• IV. Influence on oyster associates [Survey of fouling in York River, 27 September …

Rock Crab: A Potential New Resource, Paul A. Haefner Jr., W. A. Vanengel, David Garten

Reports

No abstract provided.

A Survey In The Elizabeth River For Oysters, Clams And Shell In The Vicinity Of The Proposed Transco Construction Site, Dexter Haven, Paul Kendall

Reports

This study was conducted by the Virginia Institute of Marine Science at Gloucester Point, Virginia at the request of Woodward Envicon Inc. Its purpose was to evaluate the magnitude of populations of hard clams Mercenaria mercenaria, oysters Crassos.trea virginica, I and shell in the area of the proposed TRANSCO channel, in the Elizabeth River, Virginia.

Food And Feeding Of Fishes From Magothy Bay, Virginia, Joseph J. Kimmel

OES Theses and Dissertations

No abstract provided.

An Evaluation Of Stress Induced Mortality Of Stocked Catchable-Sized Rainbow Trout In Temple Fork Of The Logan River, Robert Earl Gresswell

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The level of stress imposed by population pressure, handling and live transportation on planted catchable-sized rainbow trout in a northern Utah stream was examined. Production of adrenocorticotrophin, as measured by interrenal ascorbic acid and serum cortisol levels, did not occur in transported or planted fish.

Dead or moribund fish collected from stream or live boxes comprised 13 percent of the 2,000 fish planted. Aeromonas salmonicida, the causative agent of furunculosis, was isolated from 41 percent of 106 moribund fish sampled. In addition, 39 percent of the samples exhibited bacterial growth other than A. salmonicida. Apparently, handling, transportation, and planting did …

Mechanisms Of Population Regulation In Confined Colonies Of Peromyscus Maniculatus (Wagner) And The Response To Exploitation, Donna Corn Olsen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Wild-trapped and laboratory-reared Peromyscus maniculatus (Wagner) were raised as confined colonies indoors with various stocking densities ranging from 0.026 to 0.100 mice per sq. ft. in pens of 40, 77, and 154 sq. ft. The animals were individually tagged and all pens were censused at weekly or semi-monthly intervals to record animals present, body weights, food consumption, and overt reproductive condition. At the termination of each experiment, all mice were necropsied and organ weights of gonads and adrenals recorded. Histological sections were made of the testes and ovaries. Half the colonies were subjected to density-independent exploitation by removal of 50% …

Fish Production And Movements In The Lower Logan River, Utah, Eric P. Bergersen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Following the abatement of domestic sewage pollution xii in the lower Logan River , the fish population was investigated in terms of abundance, growth, fecundity, production, mortality, age class structure, species diversity, distribution and movements during 1970 and 1971.

Three general groupings of fish were identified in the study area on the basis of species composition, abundance and distribution using a cluster analysis technique. These were located in 1) the tributary stream (7-Mile Creek) which previously transported sewage to the river and 2) above and 3) below 7-Mile Creek in the main stream of the Logan River. A "transition" population …

Trout Movements In A Small Mountain Stream, Thomas Mark Twedt

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Five groups of 400 hatchery rainbow trout, (Salmo gairdneri), were stocked in a small, mountain stream at 3-week intervals from June to September, 1972. A fish trap captured any fish moving out of a 500 m study section.

Fish began moving at high levels during the first day of each stocking and continued at high rates for 5-8 days (Early Phase), after which movement decreased to low levels for 6-9 days (Late Phase). Early Phase fish moved primarily at night, possibly due to their disoriented state and high subjectivity to stream conditions. Fish moving during Late Phase did …

Effects Of Exercise On Serum Lactate Dehydrogenase Activity Of Catchable-Size Hatchery Rainbow Trout, Salmo Gairdneri, Gerlad T. Klar

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Effects of exercise and the relative condition of exercised fish were viii evaluated for two strains of rainbow trout. Circular tanks fitted with a paddle were used to continuously exercise the fish and a stamina tunnel was used to evaluate the condition of exercised trout. Trout were exercised continuously at one fish-length per second and one-half fish length per second. Serum LDH activity in Shephard-of-the-Hills (Missouri) rainbow trout acclimated to 10 C increased two fold during the first four days of exercise. Serum LDH activity returned to control levels by the tenth day of exercise. Serum LDH activity in Shephard-of-the-Hills …

Summary Of The Effects Of Agnes On Oyster Setting In Virginia In 1972, Dexter Haven, William J. Hargis Jr.

Reports

Oyster setting in Virginia River systems dropped to the lowest level on record during 1972. Spatfall studies indicate this poor condition to be the direct result of the effects of tropical storm Agnes.

Critical Flicker Frequency In A Harp Seal, Pagophilus Groenlandicus (Erxleben, 1777), Charles D. Bernholz

UNL Libraries: Faculty Publications

Critical flicker frequency (CFF) in a free-swimming harp seal (Pagophilus groenlandicus) was investigated using behavioral techniques. The resulting CFF versus intensity contour indicates a definite rod-cone break, confirming a duplex photoreceptor population whose presence had not been observed in previous morphological reports.

Estimated Growth Functions And Size-Age Relationships Of The Hard Clam, Mercenaria Mercenaria, In The York River, Virginia, Joseph G. Loesch, Dexter S. Haven

VIMS Articles

A study of the hard clam, Mercenaria mercenaria (Linnaeus, 1758) resources of Virginia is currently being conducted. One important aspect, their growth in this region, has been limited to the study of small juveniles (HAVEN & ANDREWS, 1957). Our objectives were to demonstrate that M. mercenaria growth functions could readily be derived and statistically contrasted, and, subsequently, the age-size relationship could be estimated.

Larval Culture Of The Calico Scallop, Argopecten Gibbus, T. J. Costello, J.Harold Hudson, John L. Dupuy, Samuel Rivkin

VIMS Articles

Mature calico scallops, Argopecten gibbus, collected from the grounds off Cape Kennedy, Florida, were induced to spawn in the laboratory. Fertilized eggs were reared to postlarvae in sea water of 23° C ± 2.0° C at a salinity of 35 %o. The external morphology of eggs and developing larval stages are described.

Meristic And Morphometric Comparison Of Hakes, Urophycis-Chuss And Urophycis-Tenuis (Pisces, Gadidae), John A. Musick

VIMS Articles

No abstract provided.

Larvae And Young Of Western North-Atlantic Bothid Flatfishes Etropus-Microstomus And Citharichthys-Arctifrons In Chesapeake Bight, Sally L. Richardson, Edwin B. Joseph

VIMS Articles

No abstract provided.

Growth And Survival Of The Bay Scallop, Argopecten Irradians, At Various Locations In The Water Column And At Various Densities, William Duggan

VIMS Articles

Two experiments were carried out in 1971 using bay scallops spawned in Aug and Sept of 1970. 4 groups of 150 scallops were held at the surface, 1 m below the surface, 2 m off the bottom, and 1 m off the bottom, to find the effects of depth on growth and survival. Scallops were held in surface enclosures at 4 different densities (100, 75, 50 and 25/ft super(2)) to find out the effects of crowding. In the depth experiment growth was approx equal throughout the water column. Mortality decreased with increasing depth with the exception of those held at …

Digestive-System And Feeding Habits Of Cunner, Tautogolabrus-Adsprus - Stomachless Fish, Labbish N. Chao

VIMS Articles

No abstract provided.

Age, Growth, And Reproduction Of Northern Puffer, Sphoeroides-Maculatus, Joanne L. Laroche, Jackson Davis

VIMS Articles

No abstract provided.

Oyster Spatfall On Shellstrings In Virginia Rivers: 1972 Annual Summary, Virginia Institute Of Marine Science

Reports

Oyster setting in Virginia river systems dipped to the lowest levels on record during 1972, according to scientists at the Virginia Institute of Marine Science who regularly monitor oyster grounds for set. A heavy set occurred on the seaside of Virginia's Eastern Shore and limited setting was observed in tributary rivers of the Mobjack Bay, but elsewhere the number of oysters setting on shellstrings and on the bottom in lower Chesapeake Bay in 1972 was far lower than for the previous year, and the lowest overall set ever recorded.

Growth And Condition Of Rangia Cuneata In The James River, Virginia, Richard Knox Peddicord

Dissertations, Theses, and Masters Projects

This project investigated several aspects of the autecology of the brackish water clam Rangia cuneata in the James River, Virginia. The study, conducted from August, 1970, through March, 1972, was primarily concerned with substrate and salinity effects on growth and condition index of R. cuneata. The studies were conducted in sand and mud substrates in four different salinity regimes. Monthly samples of 15 clams were collected at each of the eight stations for condition index determinations. Condition index was shown to vary seasonally, with a low point in early spring and a maximum in early fall. Values were higher in …

Parasites Of Some Penaeid Shrimps With Emphasis On Reared Hosts, Robin M. Overstreet

Harold W. Manter Laboratory of Parasitology: Faculty and Staff Publications

Information is presented about parasites and commensals of penaeid shrimps, allowing those who rear shrimps and those who are interested in associated organisms of shrimp to have a better knowledge of the organisms that are or may be associated with brown, white, and pink shrimps. It covers common and rare organisms and diseases, primarily in the northern Gulf of Mexico, listing several previously unreported species including an undescribed gregarine, a larval nematode (Spirocarnallanus pereirai), a commensal nematode (Leptolaimus sp.), a leech (Myzobdella lugubris), a blue-green alga (Schizothrix calcicola), a hydroid (Obelia bicuspidata …

The Predatory Behavior Of Pisaster Ochraceus (Brandt), David A. Jillson

University of the Pacific Theses and Dissertations

The persistence of predator-prey systems in evolutionar time is a function of the efficiency with which the predator obtains its food, and the ability of the prey to avoid ex- tinction. One of the important components of survival of the system is environmental heterogeneity (Huffaker 1958).

Along rocky intertidal regions of the northern Pacific coast of North America, a major predator, the starfish Pisast ochraceus has a dominant effect upon patterns of distribution of many intertidal organisms (Paine 1966). Likewise, the distribution of intertidal fauna exert an effect upon the activities of Pisaster. Other biological interactions such an grazing activities …

Parasites From Gizzard Shad, Dorosoma Cepedianum, In Lake Charleston, Illinois, Francis M. Yabai Kaikumba

Masters Theses

Eighty gizzard shad (Dorosoma cepedianum) from Lake Charleston, Charleston, Illinois were examined for parasites. Eight fish were parasitized. Three fish contained the acanthocephalan Tanaorhamphus longirostris, three fish harbored cestodes of the genus Glaridacris and two fish had the nematode Camallanus oxycephalus. The latter is here reported for the first time from gizzard shad. Twenty fish were infected with the fungus Saprolegnia sp. The numbers of helminth parasites harbored by shad are less than reported for other forage fish. However, the incident of parasitism reported in this study is greater than that reported by previous workers.

Biology And Management Of River Herring And Shad In Virginia : Completion Report, 1970-73, Walter J. Hoagman, John V. Merriner, Richard St. Pierre, Woodrow L. Wilson

Reports

This report represents the final report for the 3-year segment 1970-1973 and the annual report for the contract period 1 October 1972 to 15 October 197 3. The projec.t has been active since 1965, thus relevant data has been carried forward, added to, and analyzed in this report. The analysis, however, remains subject to later refinement and possible reinterpretation, because many of the jobs and objectives will require several additional years of study before definitive conclusions can be generalized.

The data presented here supercedes similar tables presented in previous annual reports because we have now standardized methods and solidified our …

Feasibility Of Increasing Striped Bass Populations By Stocking Of Underutilized Nursery Grounds : Completion Report 1970-1973, John V. Merriner, Walter J. Hogman

Reports

The research program at VIMS concerning striped bass in the Viiginia tributaries of Chesapeake Bay is summarized in this report. Results herein presented represent a completion report relative to the contract with the Bureau of Sport Fisheries and Wildlife; but they are only a progress report of the assessment and management program for striped bass in Virginia waters •

An Investigation Into Commercial Aspects Of The Hard Clam Fishery And Development Of Commercial Gear For The Harvest Of Molluscs : Final Contract Report For The Period 1 July, 1970 Through 30 June, 1973, Dexter S. Haven, Joseph G. Loesch, James P. Whitcomb

Reports

Because of the volumes of data presented in the final report on "An Investigation into Commercial Aspects of the Hard Clam Fishery and Development of Gear for the Harvest of Oysters", we are presenting here a brief summary of the results along with conclusions and recommendations.

A Study Of Organochlorine Insecticides In Freshwater Crayfish -- Analytical Problems And Biomonitoring Survey, Robert C. Vanderjack

Masters Theses

Crayfish were collected from 3 sites on Polecat Creek, Coles County, Illinois in early spring, early summer, and late summer of 1972. Pesticides were extracted from the crayfish tissue in a one step procedure utilizing a Florisil elution column. Analysis was by electron capture gas chromatography. Pesticide residues in the nannogram range were analyzed and background contamination was an important consideration. Sources of background contamination were investigated and teflon stopcocks, Florisil, and residues on “cleaned” glassware were found to be major contamination sources. Distilled water used in flushing glassware should also be considered a potential contamination source.

Aldrin, dieldrin, and …