Aquaculture and Fisheries Commons^™

A Mechanical Escalator Harvester For Live Oysters And Shell, Dexter S. Haven, John P. Whitcomb, Q C. Davis

VIMS Articles

A mechanical oyster harvester was designed, constructed and tested in Chesapeake Bay,Va.,from 1972 to 1976. It couples the escalator system of a conventional Maryland soft clam dredge with a newly designed head. Revolving spring-loaded teeth attached to two drums in the head pull or rake oysters from the bottom and horizontal water jets and the action of the revolving teeth impel the oysters onto a conveyor belt which carries the oysters to the boat.

Description And Occurrence Of Vexillifer Larvae Of Echiodon (Pisces, Carapidae) In The Western North-Atlantic And Notes On Other Carapid Vexillifers, Je Olney, Df Markle

VIMS Articles

Five hundred twenty-two vexillifers of an unnamed species of the carapid genus Echiodon are reported from ichthyoplankton collections made in the Caribbean Sea, Gulf of Mexico, Middle Atlantic Bight, Sargasso Sea, and Scotian Shelf. These are compared with 36 vexi1lifers and one juvenile of the only other known western Atlantic carapine, Campus ber- I/ludensis, as well as two small unidentified western Atlantic vexillifers, and eight eastern Pacific vexillifers of E. exsiliul/l. Vexillum placement relative to anal-fin origin, myomeres, and vertebral centra appears to be a useful character for separating Echiodon vexillifers from other western Atlantic carapids. The vexillum in Echiodon …

The Use Of Sonic Gear To Chart Locations Of Natural Bars In Lower Chesapeake Bay., D. S. Haven, J. P. Whitcomb, J. M. Zeigler, W. C. Hale

VIMS Articles

An underwater microphone has been developed to detect shell material on the bottom. The system is simple to use and easily constructed. It consists of a microphone encased in a PVC tube and suspended from an A-frame which is towed over the bottom. It is being used along with other methods to chart oyster bottoms in Virginia.

Development Of Pelagic Larvae And Postlarva Of Squilla Empusa (Crustacea, Stomatopoda), With An Assessment Of Larval Characters Within The Squillidae, Steven G. Morgan, Anthony J. Provenzano Jr.

OES Faculty Publications

Larvae of the predatory crustacean Squilla empusa were collected from the plankton in Chesapeake Bay and reared in the laboratory to permit description of the pelagic stages before the postlarval stage.

Characters such as rostral length and spinulation, carapace spinulation, relative size of telson, overall body size, and appearance probably are of more value for specific than for generic identification. The presence or absence of teeth on the dactylus of the second maxilliped, the presence or absence of a spine on the basis of the second maxilliped, and the number of epipods may be useful characters in determining generic alliances …

Haplosporidian And Haplosporidian-Like Diseases Of Shellfish, Frank O. Perkins

VIMS Articles

No abstract provided.

Some Aspects Of The Biology Of Deep-Sea Lobsters Of The Family Polychelidae (Crustacea, Decapoda) From The Western North-Atlantic, Elizabeth L. Wenner

VIMS Articles

No abstract provided.

Oyster Spatfall In Virginia Rivers: 1979 Annual Summary, Dexter S. Haven, Paul C. Kendall

Reports

The Virginia Institute of Marine Science (VIMS) conducts weekly surveys from June through·early October to obtain oyster spatfall information. Spat counts are made from oyster shells strung on wire and suspended from stakes on public and private beds. The number of spat on shells are counted each week of the spawning season to determine the potential of a particular area for receiving a strike and to predict the most likely period the strikes will occur. Shells planted just before the period of maximum set have the best chance of getting a good strike.

Effects Of Chlorinated Seawater On Decapod Crustaceans And Mulinia Larvae, Morris H. Roberts, Chae E. Laird, Jerome E. Illowsky

Reports

Eggs and larvae of decapod crustaceans and embryos of Mulinia laterulis were exposed to chlorinated seawater for varying periods in continuous flow systems. Mortality, developmental rate, and general behavior were recorded.

Community Structure Of Fishes On The Continental Slope And Rise Off The Middle Atlantic Coast Of The United States, John A. Musick

Reports

Otter trawl cruises were conducted off the middle Atlantic coast of the U. S. from 1971 to 1975. More than 50,000 specimens of demersal fishes were captured during this program at depths of 75 m to 3000 m. Species assemblages were distributed along a coenocline with bathymetric areas of rapid faunal change (anantoclines) and of more gradual faunal change (aganoclines). Between 75 and 3000 m anantoclines were found at 150 to 200 m, 400 to 600 m, 900 to 1000 m, 1350 to 1500 m, and 1900 to 2100 m. Species diversity (Hl) increased between the continental shelf and slope, …

Freshwater And Marine Fishes, Robert E. Jenkins

VIMS Books and Book Chapters

The current list of freshwater fishes known from Virginia stands at 206 species, including 10 that are diadromous and 4 others ranked as freshwater-estuarine. Eight of the freshwater and one of the freshwater-estuarine species were introduced to the state. Several additional strictly freshwater fishes are expected to be discovered. The Virginia freshwater ichthyofauna is relatively rich in species compared with most other states. For example, Maryland and Delaware together have 99 species (Lee et aZ., 1976), West Virginia 151 (Denoncourt et aZ., 1975), Kentucky 201 (Clay, 1975), and North Carolina 195 (Menhinick et aZ., 1974). Some of these totals reflect …

Proceedings Of Workshop On Soft Shell Blue Crabs : September 22, 1979, Charleston, South Carolina, David M. Cupka, Willard A. Van Engel

VIMS Books and Book Chapters

The Workshop on Soft Shell Blue Crabs was held on September 22, 1979 at the Marine Resources Center of the South Carolina Wildlife and Marine Resources Department in Charleston, South Carolina.

The purposes of the workshop were to describe current research and development activities relative to soft shell blue crabs in the Coastal Plains Region; to review existing laws and regulations in regards to soft shell crab fisheries and shedding operations; and to discuss methods for harvesting, handling, shedding and marketing soft shell blue crabs.

A New Roe Knife, Jim Zaborski

Reports

No abstract provided.

Oyster Spatfall On Shellstrings In Virginia Rivers: 1978 Annual Summary, Dexter S. Haven, Paul C. Kendall

Reports

The Virginia Institute of Marine Science (VIMS) conducts weekly surveys from June through early October to obtain oyster spatfall information. Spat counts are made from oyster shells strung on wire and suspended from stakes on public and private beds. The number of spat on shells are counted each week of the spawning season to determine the potential of a particular area for receiving a strike and to predict the most likely period the strikes will occur. Shells planted just before the period of maximum set have the best chance of getting a good strike.

A Study Of The Shellfish Resource In Brick Kiln Creek, Below Route 172, Before Construction, Dexter S. Haven, Paul C. Kendall

Reports

Sampling of the shellfish resource in the lower part of Brick Kiln (or Wythe) Creek was conducted by personnel of the Virginia Institute of Marine Science during August, October and November of 1978. Live oysters.were found in several places from the bridge downstream t9 the mouth. Observations indicate that the oyster beds here have average growth and normal rates of survival; recruitment is occurring. No other species of commercially valuable shellfish was found.

Nansemond River, Study Of Leased Oyster Grounds In The Vicinity Of The Us 17 Bridge (Before Construction), Dexter S. Haven, Paul C. Kendall

Reports

Leased oyster ground in the vicinity of the US 17 Bridge across the Nansemond River was sampled in September, October and November of 1978 and January of 1979 by the Virginia Institute of Marine Science. ·The purposes were: 1) to determine the extent of the shellfish resources on the leased areas; and 2) to estimate the value of those resoμrces occurring within the proposed right-of-way. Other than one small, isolated lump, the only place oysters were found within the area studied was on three adjacent leases of Henry Parker.

Estimated Total Finfish Biomass For The James River For 1975, Frank J. Wokcik

Reports

The following biomass estimates were computed from trawl catches made during the VIMS ichthymlogy fish surveys. These catches were adjusted by whatever information was available in the literature on mortality rates, and length-weight relationships to arrive at the .. best available estimate of standing crop, and then its weight.

The Ecology Of Invertebrate Drift And Feeding Chronology Of The Striped Shiner, Notropis Chrysocephalus (Rafinesque) In Polecat Creek, Illinois, Dennis L. Newman

Masters Theses

The downstream drift of macroinvertebrates and the daily feeding cycle of the striped shiner, Notropis chrysocephalus (Rafinesque), were studied during the spring and summer of 1978 in Polecat Creek, Illinois. The purpose of the study was to: investigate the drift phenomenon of an entire lotic community, determine the pattern of diel periodicity for several important benthic populations, make qualitative and quantitative assessments of the relation of drift to benthos, and examine drift in relation to the daily feeding ecology of a cyprinid carnivore.

Polecat Creek at the sampling site was a relatively fast-flowing third-order stream, with frequent riffles. Drift sampling …

Feeding Studies On Three Species Of Fish From Tomales Bay, California, John Brezina

University of the Pacific Theses and Dissertations

The study of fish diets or feeding behavior is an important aspect in ecology. Analysis of fish stomach contents often provides data for determining resource utilization, feeding strategies, and overlaps in food items among and between species. Studies of fish diets could also be used for testing ecological theory or provide management procedures for fisheries if methods could be developed for minimizing competitive food utilizations by other fish and enhancing growth of exloited fish populations (Obrebski and Sibert 1977). In order to understand more about ecological communities and competitive predatory relationships of fish, more data are required on their diets …