Self-submersion base net cage

The utility model discloses a self-submersion base net cage which comprises a ground net cage body provided with a rigid main frame. A prismoid floating frame is connected with the upper portion of the main frame. The inner side of the ground net cage body is connected with a closed netting. The lower side of the rigid main frame is connected with a traction rope, and the traction rope is connected with a self-submersion base which is provided with a contraction-release control assembly. The contraction-release control assembly can contract and release the traction rope according to the needs so as to control the distance between the self-submersion base and the rigid main frame. The distance between the self-submersion base and the rigid main frame can be controlled through the contraction and the releasing of the contraction-release control assembly, and the harvesting and stocking of commercial fish can be conducted according to the needs. The outer side of the rigid main frame is connected with an anchoring rope through the traction rope and can form an array system which facilitates management. Since the main body is basically located at the bottom of water at ordinary times, the influence of wind waves on the main body is almost zero, the aquaculture safety is high and the convenience of management is also provided. Meanwhile, since the anchoring system omits the balance weight, the resistance to the system in the water can be reduced, and the anti-shunt performance is more outstanding comparing with the prior art. Moreover, the aquaculture capacity is relatively constant due to the utilization of the rigid main frame, since the main frame is located at the bottom of the water, the influence of the wind waves is smaller comparing with the prior art, and thus a better aquaculture capacity stability is provided, and the tension of an anchor of the anchoring system caused by the wind waves can be obviously reduced according to the value simulate computation. Therefore, the self-submersion base net cage has the advantages of being free of the balance weight system, convenient to manage, good in wind-wave-current resistant performance, constant in aquaculture water capacity, and applicable to aquaculture of fish in the middle or lower layer.