海洋贝类由于其滤食性特点而极易受到重金属的污染。
Marine shellfish is easily polluted by heavy metals because of its characteristics of filter-feeding.
然而，不像鳜鱼，牡蛎具有滤食性，它能够清理水系，让养殖农场成为海洋环保的一部分。
Unlike salmon, moreover, oysters are filter feeders that clean up the water column, making oyster farms healthy parts of the ocean.
表明应是一种较低级的滤食性动物，可能与古杯动物有一定亲缘关系，不应将其归属藻类。
All these features indicate that the organism should be a kind of lower class animal of filter feeder with certain affinity to Archaeocyathids but should not be classified into algae.
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