The influence of multiple environmental stressors on susceptibility to parasites: an experimental determination with oysters

Article Abstract:

Influence of multiple environmental stressors on susceptibility to parasites has been studied in the oyster Crassostrea virginica with the parasite, the protozoan Perkinsus marinus. The latter organism has decimated oyster populations in North American estuaries. Using 24 experimental oyster reefs in the North Carolina Neuse River estuary, several factors, including temperature, flow speed, concentration of dissolved oxygen, and salinity, were monitored, 12/94-7/95. Clear separation was found between environmental factors among reefs. A majority of the variation among treatments could be explained by two principal component axes, one flow and the other temperature, salinity and DO. At the base of reefs where flow speeds and food quality were lowest and sedimentation highest, the highest infection rate and greatest mortality existed. Restoration of reefs increases their height and flow speeds, reducing negative effects of disease.

North Carolina, Research, Planning, Environmental aspects, Host-parasite relationships, Protozoa, Protozoans, Oysters, Estuarine ecology, Estuarine ecosystems, Estuarine area conservation, Estuarine conservation

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Microwave digestion method for phosphorus determination of fish tissue

Article Abstract:

A microwave acid digestion method has been developed for use in phosphorus measurement using spectrophotometric methods in fish tissue. It can save time and is simple. The method took half the time it takes to run the same number of samples using ashing in a muffle furnace. A frozen northern pike and dried oyster tissue were used in testing the method.

United States, Analysis, Usage, Microwave ovens, Measurement, Fish (Food product), Animal feeding and feeds, Phosphorus, Phosphorus (Chemical element), Fish as feed

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