Materials and Methods
Sample collection
Samples of fish eggs and larvae were collected from 30 stations between 121.5°~124°E and 29.5°~31°N (Fig. 1) based on the Technical Regulations of Marine Biological Ecological Investigation in the ECS-CZA in April and November of 2018, and April and November of 2019. Sample collections used horizontal opening trawls (opening diameter in 80 cm; net opening area of 0.5m2; net length of 280 cm). Trawling used a constant speed of 2km for about 10 minutes. All the sample collection locations were shown in Fig 1. The planktonic samples were sieved through smaller sized meshes, washed with seawater, and then fish eggs and larvae were sorted and separated from the plankton samples and placed into different jars with 100% ethanol according to sampling stations and seasons.