The kelp knots are the main product for exporting and earning foreign exchange in Chinese kelp culture provinces, but there are no mechanical processing devices. Therefore, the kelp knots are usually tied manually. Based on the principle of bionics, this paper offered an automatic knotting machine which could make the kelp forming a circle and passing through it to form a knot with the logic circuit. The test verified that this knotting machine was able to complete the operational requirements for kelp knotting accurately, which showed that this design was reasonable and feasible, and had the value of promotion and application after further optimization. It could also provide certain reference for the design and application of relevant knotting equipment.

Methods of cleaning the fouling organisms in the process of aquaculture is related to production benefit, because of the aquaculture facilities, mariculture objects or aquaculture process can be affected by fouling organisms.The present paper investigated the treatment methods for fouling organisms of marine aquaculture facilities in the main aquaculture areas of Fujian Province.According to the survey, there was a lack of effective preventive measures while manual removal was the main way.Actually, the fish farmers usually ignored it, even if needed to clean, dry or manual removal were the preferred methods.Only a few were treated with a screen washer or sprayed with formalin.The survey showed that the main treatment methods for fouling organisms in Fujian province were traditional, time-consuming, inefficient, and labor intensive, even more, advanced technique and equipment were difficult to adapt to actual production.