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Quantitative Ecological And Histological Analysis Of Parasitism Of Bivalve, Alexandria, Egypt | 27000
ISSN: 2155-9910
Journal of Marine Science: Research & Development
Open Access
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Understanding how seafood will be influenced by coming environmental changes is very important in research. The aim
of this experiment was to compare the heavy metal and parasitic contamination from different coastal areas in Egypt
(El Asafra, Eastern harbor, and El Mex). Results show that, the gonads of clam may be parasitized by parasitic castration. A
quantitative histological analysis of the parasitized gonads in the present study demonstrated a significant decrease in gonadal
area, in the size of individual acini, compared to un-parasitized clams. Castration may be caused by mechanical compression
sporocyst growth. It is suggested that parasitic castration has a primary effect on the host?s gametogenic systems that regulate
gamete production. Diseases of bivalve molluscs are noteworthy not only for their impact on population dynamics, especially
of key commercial species, but also for characteristics that separate them from typical diseases affecting mammals and fish.
Most described bivalve diseases are of protozoan and transmission is via the water column, as adult hosts are immobile.
Transmission can occur over large distances and can be swift under favorable climatic conditions, resulting in rapid parasite
proliferation and mass adult mortalities. In the present study, contamination of bivalve; Ruditapes decussatus in costal seawater
of Alexandria; in three localities El Asafra, Eastern harbor, and El Mex in Alexandria were surveyed for waterborne protozoa.
The results revealed the presence of Cryptosporidia, Cyclospora and Microsporidia species in the samples collected from El Max.
Cryptosporidia only were collected from Eastern Harbor. Cryptosporidia and Microsporidia but not Cyclospora were infective
to the gut mucosa of the Ruditapes decussatus. As eating raw or inadequately cooked Ruditapes decussatus is a common habit
in Egypt, contamination of the Ruditapes decussatus by Cryptosporidia and Microsporidia may pose a threat to human health
if they were among the species infecting man.
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