The collection of small or microscopic organisms, including algae and protozoans, that float or drift in great numbers in fresh or salt water, especially at or near the surface, and serve as food for fish and other larger organisms.

• 浮游生物小生物或微生物的集合，包括大量生活在淡水或咸水中的水藻和原生动物，尤指在水表或靠近水面处，为鱼类或其它大型生物体提供食物