The largest number of small miscellaneous fish in this place include ballang fish, sardines and red shirt fish.

1. Ecological environment: Hainan is located at the southern tip of my country and has rich marine resources and a complete coastline ecosystem. This ecological environment provides good living conditions for a variety of fish, allowing fish such as barang fish, sardines, and red shirts to thrive in Hainan.

2. Rich bait: The offshore waters of Hainan are rich in plankton, benthic organisms and artificially released bait, providing a rich food source for fish. This allows small miscellaneous fish such as balang fish, sardines and red shirts to reproduce and grow rapidly in Hainan.

3. Seasonal migration: Small miscellaneous fish such as ballang fish, sardines and red shirts will migrate in specific seasons to find an environment more suitable for survival and reproduction. The Hainan region is located along the South China Sea, and its rich fishery resources and warm climate conditions make it an important destination for these fish migrations.