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Full-Text Articles in Life Sciences
Usable Meat Yields In The Virginia Surf Clam Fishery, Joseph G. Loesch
Usable Meat Yields In The Virginia Surf Clam Fishery, Joseph G. Loesch
VIMS Articles
The weight of surf clam meat landed in Virginia is estimated by the National Marine Fisheries Service, Division of Statistics and Market News (DSMN) by multiplying bushels landed by a constant of 17 lb (7. 71 kg) of total meat per bushel. However, total meat weight includes the viscera, a portion of clam not utilized by the industry. Herein is an analysis of the yield of useable surf clam meat weight per bushel and seasonal variability in meat weight relative to seawater temperature for Virginia stocks
Distribution And Relative Abundance Of 7 Species Of Skates (Pisces-Rajidae) Which Occur Between Nova-Scotia And Cape-Hatteras, John D. Mceachran, John A. Musick
Distribution And Relative Abundance Of 7 Species Of Skates (Pisces-Rajidae) Which Occur Between Nova-Scotia And Cape-Hatteras, John D. Mceachran, John A. Musick
VIMS Articles
No abstract provided.
Fine-Structure Of Minchinia Sp (Haplosporida) Sporulation In Mud Crab, Panopeus-Herbstii, Frank O. Perkins
Fine-Structure Of Minchinia Sp (Haplosporida) Sporulation In Mud Crab, Panopeus-Herbstii, Frank O. Perkins
VIMS Articles
Morphogenetic changes which accompany sporulation of Minchinia sp. in the mud crab (Panopeus herbstii) are described. Small (4-19 /-1m diameter) plasmodia, the precursor cells for the sporulation sequence, increase in size and numbers of nuclei per cell to form sporonts with a delimiting wall. Since widely divergent nuclear sizes (2.3-5.9 /-1m diameter) and paired small nuclei < 3 /-1m diameter) were observed in sporonts, it is suggested that karyogamy occurs followed by meiosis. Evidence for meiosis is the observation of synaptonemal-like complexes and polycomplex-like structures in sporont nuclei. Sporonts cleave into uninucleate sporoblasts following one of two pathways. In the presumably "normal" sequence, a cytoplasmic syncytium is formed followed by cleavage into uninucleate sporoblasts. In the other, sporont protoplasm is asynchronously "carved" into uni- or binucleate sporoblasts or sporoplasms as a result of delimitation at the surface and internally. Since aberrant spore formation was commonly observed in the latter type of sporont, its cleavage patterns are considered to be anomalous. A sporoplasm is then delimited in each sporoblast and spore maturation follows. Haplosporosomes were observed in plasmodia and spores, but not in intermediate cell stages. Mitotic apparati appear to be persistent through interphase in plasmodia and sporonts and consist of two spindle pole bodies connected by a bundle of micro tubules.
Culture Of The Bay Scallop, Argopecten Irradians, In Virginia, Michael Castagna
Culture Of The Bay Scallop, Argopecten Irradians, In Virginia, Michael Castagna
VIMS Articles
In recent years there has been increased interest in the development of marine aquaculture or mariculture. Techniques for growing many traditional species. such as oysters and quahogs. have been developed, and considerable effort has also been made to test the feasibility of culturing new . less traditional species (Loosanoff and Davis,1963 : Iversen. 1968; McNeil, 1970; Price and Maurer, 1971: and Milne ,1972). This paper reviews the natural history of the bay scallop. Argopecten irradians Lamarck, and presents a review of the Virginia Institute of Marine Science's (VIMS) continuing research on this species which began in 1968.
Occurrence Of Elvers Of Synaphobranchus-Affinis On Continental Slope Off North-Carolina, Charles A. Wenner
Occurrence Of Elvers Of Synaphobranchus-Affinis On Continental Slope Off North-Carolina, Charles A. Wenner
VIMS Articles
No abstract provided.
Two New Species Of Sciaenid Fishes (Tribe-Sciaenini) From Caribbean Sea And Adjacent Waters, Ln Chao, Rv Miller
Two New Species Of Sciaenid Fishes (Tribe-Sciaenini) From Caribbean Sea And Adjacent Waters, Ln Chao, Rv Miller
VIMS Articles
The genus Sciaena , heretofore monotypic, is characterized by the lack of mental barbels and an elongate swimbladder with no appendages. Two new species S. trewavasae and S. bathytatos are described herein. The new species differ from S. umbra, the type species of the genus, and from one another in the following characters: S. umbra has 11 + 14 vertebrae, 15-20 gill rakers, 23-26 soft dorsal rays, 9-13 inner gill rakers; S. trewavasae has 10 + 15 vertebrae, 19-21 gill rakers, 24-26 soft dorsal rays, 13-16 inner gill rakers; S. baillylalos has 11 + 14 vertebrae, 22-27 gill rakers, 21-23 …
Fine-Structure Of Haplosporidian Kernstab, A Persistent, Intranuclear Mitotic Apparatus, Frank O. Perkins
Fine-Structure Of Haplosporidian Kernstab, A Persistent, Intranuclear Mitotic Apparatus, Frank O. Perkins
VIMS Articles
The fine structure of the haplosporidan mitotic apparatus is described from observations of plasmodial nuclei of Minchinia nelsoni, M. costalis, Minchinia sp., and Urosporidium crescens. The apparatus, which is the Kernstab of light-microscope studies, consists of a bundle of microtubules terminating in a spindle pole body (SPB) at each end of the bundle. A few microtubules extend from SPB to SPB, but most either extend from an SPB and terminate in the nucleoplasm or lie in the nucleoplasm, free of either SPB. The bundle lengthens during mitosis, increasing the SPB-to-SPB distance by a factor of 2 to 3 as …
The Hyperparasite, Urosporidium Spisuli Sp. N. (Haplosporea), And Its Effects On The Surf Clam Industry, Frank O. Perkins, D. E. Zwerner, Robert K. Dias
The Hyperparasite, Urosporidium Spisuli Sp. N. (Haplosporea), And Its Effects On The Surf Clam Industry, Frank O. Perkins, D. E. Zwerner, Robert K. Dias
VIMS Articles
SSurf clams (Spisula solidissima) from along the Virginia and North Carolina coasts are infected with an immature anisakid nematode worm which does not cause economic concern until infected with the protozoan hyperparasite, Urosporidium spisuli sp. n. When the protozoan sporulates the spores give the worm a brownish-black appearance, thus making it readily visible in clam tissues. Light and electron microscope studies of the spores reveal characteristics which differentiate the protozoan from other species of Urosporidium. All spores are killed after 5 to 30 min at 100 C; therefore, the consumer would not ingest live spores when eating commercially prepared clam …
Reproduction And Recruitment Of The Brackish Water Clam, Rangia Cuneata In The James River, Virginia, Thomas D. Cain
Reproduction And Recruitment Of The Brackish Water Clam, Rangia Cuneata In The James River, Virginia, Thomas D. Cain
VIMS Articles
Reproduction and recruitment of the brackish water clam Rangia cuneata were investigated in the James River, Va., from February 1970 to January 1972. Histological examinations of gonads were made, newly set clams were collected, and temperature and salinity measurements were taken from three populations living in different salinity regimes.
Systematics And Morphology Of Bonitos (Sarda) And Their Relatives (Scombridae, Sardini), Bruce B. Collette, Labbish N. Chao
Systematics And Morphology Of Bonitos (Sarda) And Their Relatives (Scombridae, Sardini), Bruce B. Collette, Labbish N. Chao
VIMS Articles
No abstract provided.