污染、藻类大爆发，以及气温上升都是影响甲壳类生物量降低的因素。
Pollution, algae blooms, and rising temperatures all have roles to play in places where where shellfish stocks are declining.
现在，即使是大的石油感兴趣的藻类。
由于传统稳定塘占地面积大、处理效率低、产生藻类等缺点，限制了其工艺的推广应用。
Traditional pond system has the shortages such as large area occupied, low treatment efficiency and overgrowth of algae, which restrict the utilization of pond treatment system.
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