... and durable 3.Maintenance free 4.Environmentally friendly Build a fish farming cage system , you need those material as follow 1 ... . pontoon cubes (hdpe ) connect all kinds of fish farm type you need 2. fish nets Enlarge pictures ,fishing pontoon cubes Specifications: Dimension ... , gray, blackLoad Capacity:each one square meter is made up of four pontoons, top load is 325kgs.Draft without load: 2 ...