economic importance of oyster and mussel

CHUNG KA LEUNG h9524120 at
Wed Jan 31 08:53:31 EST 1996

	Oyster can reduce the poisonous materials in water, in turn to 
save the organisms.  Besides above-mentioned economic importance, is 
there any other importance of oyster and mussel?  Thank you for your 
attention.  If possible, please send us some address related to this 

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