Mantis shrimp (Oratosquilla oratoria), the main catches of stow net fishing vessel in Zhangpu, Fujian Province, were followed and sampled monthly from August 2022 to April 2023. A total of 368 samples were used to determine the body length and body mass, to characterize the feeding intensity and female ovarian development, and to calculate the ratio of males to females in the catch, in order to analyze the fishery biology of O.oratoria. The results showed that the ratio of female to male was 1∶1.115 in the catch of O.oratoria, the dominant body length group was 110-130 mm, the dominant body mass advantage group was 15.0-25.0 g,and there was no significant difference in average body length and average body mass between male and female samples. The relationship between body length and body mass was W = 2.140×10^-5L^2.882 (R² =0.946, n=368). The gonadal maturity of female O.oratoria was between stage Ⅰ-Ⅲ, and stage III individuals mainly appeared from February to April. The average feeding grade of O.oratoria was 1.44, of which grade 1 was the most. The average annual condition factor index of O.oratoria was 1.226, and the male was slightly larger than the female.

Based on the data of fisheries resource survey by trawling from Minjiang Estuary and adjacent waters in Fujian in March,May,July,August in 2021,species composition,quantitative distribution,dominant species and community biodiversity characteristic of the fish were analyzed.Results showed that there were 104 kinds of fish in the investigated sea area,belonging 13 orders,46 families and 71 genera;among which the most species were Perciformes(50 kinds),followed by Clupeiformes(16 kinds).The temperature adaptability of fish was mainly warm water species,accounting for 70.19%,and the distributed water layer was mainly at the bottom species and the near-bottom species,accounting for 69.23% in total.There were 14 kinds of dominant species such as Coilia mystus,Parargyrops edita,Konosirus punctatus,and so on,most of them only occurring in 1 or 2 surveys,with significant seasonal differences.The fish stock density in weight and quantity were 667.10 kg·km^-2 and 71.91×10³ ind·km^-2,respectively,which were higher in summer than spring.The Shannon-Wiener biodiversity index of fish in Minjiang Estuary was at a good level(2.622).