The sakura shrimp (Sergia lucens Hansen) is a pelagic planktonic shrimp that is caughtcommercially in the Suruga Bay of Japan and the coastal waters off southwesternTaiwan. In Taiwan, the main fishing grounds of S. lucens are located in from betweenlatitude 22º 6'N and 22º 27' N to longitude 120º 12'E and 120º 39'E. The area of fishing grounds, about 320km2, was only located in theisobath line of sea bottom between 100m and 300m in depth. The fishing season wasduring the period from November to May next year. The sakura shrimp with thin shell,rich in calcium and directly consumed by people, was a precious stock in the coastalwaters of Taiwan. At the present time, however, few papers have been published forstudying this shrimp. Therefore, to understand the ecology of S. lucens and mechanismof fishing ground formation, the fishing data, sea condition and S. lucens samples werecollected monthly. We also want to study the initial usable stock size and the resourceassessment of S. lucens for estimating the optimum yield and establishing the sustainablemanagement model.