The aquaculture ship is one of the core equipment for the development of deep sea aquaculture, and the large aquaculture ship using recirculating water technology is one of the main technical route for the development of aquaculture ships in China. With recirculating water aquaculture system as the core, the factory aquaculture technology is adopted to improve the application scope and industrialization level of the aquaculture equipment. In view of the characteristics of this type of ship, a general design idea is proposed based on the development of some 80,000 m³ aquaculture ship, which focuses on the general arrangement, system design, structural design and overall performance analysis by taking the recirculating aquaculture system as the core. The design points of the recirculating aquaculture system, the water intake system, and the aquaculture comprehensive management and control system are discussed to provide references for the subsequent design of this type of ship.

The technical characteristics and challenges of the current integrated mode of the integrated pulp hydraulic riser and the self-propelled mineral collector for surface mining vessels are described from the top-level system mode of the mineral development aiming at the development frontier of the deep-sea mining technology. The innovative modes of the surface distributed and underwater distributed mineral development are proposed for the technical problems that are difficult to solve in the mining of the polymetallic nodules, such as the surface and underwater system series reliability, operation in the severe sea conditions, energy consumption and economy and emergency release. The conceptual scheme, main system configuration and the key technical indicators of the two modes are introduced. It is suggested that the engineering demonstration and the verification of the overall system process of the deep-sea mineral development can be carried out based on the integrated mode of mining, transportation and storage. The advanced technologies, such as the surface distributed and underwater distributed mineral development, are promoted to develop the all-weather, high-production, low energy consumption, environmental protection and intelligent mineral development system.