This paper sudies the population structure and reproductive chracteristics of mud skipper, Boleophthalmus pectinirostris, in Shenzhen Bay, Guangdong province. The results show that the population includes the classes age of 0, 1, 2, and 3 years, and they account for 12. 58%, 58. 70%, 27. 40% and 1. 26% of the total number, respectively. The relationship between body length and weight is computed by the equation: W=4. 1618 × 10-5L2.7451. The sex ratio of females to males is 3: 2. The fish begins maturating a...