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Fig. 4
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Variations in the stock biomass of the clams in harvestable size (D6–D7) (a) and harvest of the clams (b) in the culture area in 1988–2014, and relationship between harvestable stock and harvest (c), and the quantity of introduced seed clams and harvestable stock (D6–D7) (d). Records of harvest in 2004 were unavailable.
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