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Plankton Energetics Of Raritan Bay, Bernard Patten

VIMS Articles

Plankton production in Raritan Bay is described based on total chlorophyll data and two series of 24-hr dark and light bottle differential oxygen experiments. Maximum chlorophyll (r) recorded was 663 ,ug L-l in a bloom of Massutiia rotundata. Utility of pigment data in estimating productivity or biomass is regarded as dubious: i) 17.3 x lo6 chains of Skeletonema costatum once corresponded to only trace quantities of chlorophyll; ii) production occurred several times in absence of detectable chlorophyll.

Oyster Mortality Studies In Virginia. Ii. The Fungus Disease Caused By Dermocystidium Marinum In Oysters Of Chesapeake Bay, Jay D. Andrews, Willis G. Hewatt

VIMS Articles

A high death rate of oysters in Virginia waters during the warm months of summer and fall was reported by Hewatt & Andrews (1954b). One of the most important causes of this warm-season mortality is the fungus Dermocystidium marinum, a pathogen discovered in the Gulf of Mexico by Mackin, Owen & Collier (1950). The fungus is found along the coast of the Western Atlantic from Delaware Bay to Florida and on the coast of the Gulf of Mexico from Florida to Texas.

In Chesapeake Bay the disease was studied for pathogenicity to oysters, seasonal occurrence, distribution, and its effect on …

Trapping Oyster Drills In Virginia Iii. The Catch Per Trap In Relation To Condition Of Bait, J. L. Mchugh

VIMS Articles

In the course of trapping experiments previously described (Andrews 1955, McHugh 1955), a question arose concerning deterioration of bait with time. It is fairly obvious to those who fish the traps that the condition of the bait changes. The smallest oysters die first, through predation by drills, crabs, and other enemies, and through smothering in the muddy bottom. Barnacles and other organisms on the shells also die from various causes. The valves of the dead oysters soon separate, and some are lost through meshes of the trap, so that the volume of bait also decreases. Stauber (1943) found that efficiency …

Trapping Oyster Drills In Virginia I. The Effect Of Migration And Other Factors On The Catch, Jay D. Andrews

VIMS Articles

Virginia oystermen have tried trapping of drills as a control measure and discarded it as ineffective and too costly. It is true that their efforts were sporadic and lacking in persistence, and the effects of their trapping were not adequately appraised. They expected returns in the form of increased yields too quickly. Nevertheless, these brief trials have convinced even the most progressive oystermen that trapping· drills is not the answer to their predation problem. In Chesapeake Bay, consequently, no conscious effort is made to control drills. Oyster grounds are often allowed to lie fallow for several year's, a practice which …