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breeding pond 養魚塘。

breeding ratio

Maintains the breeding ponds so that sediment does not collect on the bottom , and also controls water quality :維持繁殖池,分解排泄物,可減輕排泄物對水質的污染,對改善水質有幫助。

Maintains the breeding pond so that sediment does not collect on the bottom 維持繁殖池,池底不產生污泥,控制水質。