In order to ensure the quality of catches, keeping fresh is one of the important functions of fishing boats. The preservation methods on board generally include ice storage, cold sea water preservation, salt storage, micro-freezing, freezing, etc.

Most fishing boats are small in size. However, in order to adapt to continuous navigation and operation in the wind and waves, it is required to have good stability, seakeeping and seaworthiness, and the structure needs to be particularly firm. The load capacity changes greatly during operation.