In this study, we focused on the Sergia shrimp biology, reproduction and growth in order to understand the reasons of fluctuation of Sergia shrimp resources in I-lan Bay. Our results showed that the main catch species was Sergia lucens accounted for 88.97% of total catch. This year's catch per unit effort (CPUE) was about 3391.83kg per boat per month, lower than last year. According the acquisition data from processing plants, the Sergia shrimp production in 2014 was about 200-300 tonnes.