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Full-Text Articles in Life Sciences
Treatment Of Shell Cultch With Polystream To Increase The Yield Of Seed Oysters, Crassostrea Virginica, Michael Casatagna, Dexter S. Haven, James B. Whitcomb
Treatment Of Shell Cultch With Polystream To Increase The Yield Of Seed Oysters, Crassostrea Virginica, Michael Casatagna, Dexter S. Haven, James B. Whitcomb
VIMS Articles
A commercial scale study was conducted on the Eastern Shore of Virginia during 1964, 1965 and 1966 to evaluate treatment of shell cultch with Polystream. Three intertidal reefs of the same approximate size were shelled with similar amounts of untreated shells.
Strobilation Of Chrysaora Quinquecirrha Polyps In The Laboratory, Harold N. Cones Jr.
Strobilation Of Chrysaora Quinquecirrha Polyps In The Laboratory, Harold N. Cones Jr.
VIMS Articles
The scyphistoma of Chrysaora quinquecirrha was induced to strobilate in the laboratory. Detailed description of the process is given. Just prior to strobilation, the goblet-shaped polyp undergoes color change and clefting. Each scyphistoma typically releases five ephyrae. Terminal tentacles are resorbed during strobilation and appear near its completion at the base of the strobila. Upon release, ephyrae swim to the surface and attempt to maintain their position there. Strobilation is normally complete in 20-25 hours after clefting. All stages survive well on Artemia, enchytraeids, ground ctenophores, and similar food.
Levels Of The Herbicide Diquat In Two Estuarine Molluscs And In The Water And Mud, Dexter S. Haven
Levels Of The Herbicide Diquat In Two Estuarine Molluscs And In The Water And Mud, Dexter S. Haven
VIMS Articles
Soft clams Mya arenaria and oysters Crassostrea virginica were exposed to 0.35 ppm of the herbicide Diquat during June and July 1967 in Nomini Creek Virginia, a tributary of the Potomac. No detectable residue was found in oyster meats or in the water. Meats of soft clams minus the rough integument surrounding the neck, showed no Diquat. The integument, however, contained from 0.00 to 0.05 ppm. Mud samples contained from 1.17 to 7 .14 ppm. It was assumed that Diquat was strongly sorbed on clay particles in sediments; residues in clam integuments were due to trapped clay particles.
Larval Development Of The Coquina Clam, Donax Variabilis Say, With A Discussion Of The Structure Of The Larval Hinge On The Tellinacea, Paul Chanley
VIMS Articles
Adult specimens of Donax variabilis were spawned in the laboratory and the larvae reared to metamorphosis. Larval length increases from 70 p. to 340 p. during pelagic stages. Height is originally 10 p. to 15 μ. less than length. Height increases less rapidly than length and may be 50 μ. less than length at metamorphosis. Depth is originally 50 μ. less than length. It also increases more slowly than length and may be 150 p. to 170 μ. less than length at metamorphosis. Length of the hinge line is 50 μ. to 60 p.. Round umbos form when larvae are …
Batillipes Gilmartini, A New Marine Tardigrade From A California Beach, Maxine Mcginty
Batillipes Gilmartini, A New Marine Tardigrade From A California Beach, Maxine Mcginty
VIMS Articles
Two SPECIES of marine tardigrades have been reported from the Pacific coast of North America. Schuster and Grigarick (1965) studied Echiniscoides sigismundi Schultze, 1865, from algae and barnacles. This species is thought to occur along much of the west coast. Styraconx sargassi Thulin, 1942, was reported as Bathyechiniscus tetronyx Steiner, 1926, from washings of Dictyota sp. by Mathews (1938). Although marine tardigrades are often found in association with algae and a variety of animals, they are most abundant in the interstitial spaces of sandy beaches. The apparently rich interstitial fauna of the west coast has not as yet been investigated.
Larval Development Of Bathynectes Superba (Costa) Reared In The Laboratory., Morris H. Roberts Jr.
Larval Development Of Bathynectes Superba (Costa) Reared In The Laboratory., Morris H. Roberts Jr.
VIMS Articles
The present study was undertaken to determine the number of larval stages in Bathynectes, and to describe each larval stage in detail based on laboratory raised specimens. Criteria for distinguishing Bathynectes from other Portunidae were sought.
Boring Mechanism Of Polydora Websteri Inhabiting Crassostrea Virginica, Sarah A. Haigler
Boring Mechanism Of Polydora Websteri Inhabiting Crassostrea Virginica, Sarah A. Haigler
VIMS Articles
The boring mechanisms of species of polydorid polychaetes are little understood due to lack of experimental evidence and direct observations. In thepresent studies the boring mechanism of adults and metamorphosing larvae of Polydora websteri was investigated by (1) inducing adults and larvae to settle against test substrates, (2) observing behavior in natural burrows and in "artificial blisters"composed of transparent "Pliobond" films surrounding Iceland spar substrates, (3)removing the giant setae of worms prior to tests of boring, (4) applying the giant setae to substrates, and by (5) testing for production of acid.All the layers of oyster shell, including conchiolin, were bored. …