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Sardines and anchovies, which are widely distributed in the mid-latitude oceans, play an important role in the energy cycle of marine ecosystems as they forage for plankton and grow into large schools, but are preyed upon by a variety of organisms. The population of these fish fluctuates drastically by several orders of magnitude over several decades, which is a common phenomenon in all global habitats, although the cause of these fluctuations is far from clear. I sensed a beauty of natural world system in this phenomenon, and started my research to find out the exact mechanism.