江河养殖船结构及改进的研究

THE STRUCTURE OF CAGE-SHIPS FOR CULTURING FISH IN RIVERS AND ITS IMPROVEMENT

养殖船主尺度（ｍ）为Ｌ＝３１．３０～４０．５０，Ｂ＝５．５０～７．００，Ｈ＝１．３０～１．７０，Ｔ＝１．０５～１．４４；船型系数为α＝０．９５～０．９９，β＝０．９９～１．００，δ＝０．８５～０．９０。船型与非动力驳船最为接近。养鱼舱面积为９０ｍ￣２～１８０ｍ￣２，水体交换利用金属网或船壳凿孔进行。养殖船具有向大尺度、高造价和废旧船舶利用以及简易化，低成本演变的趋势。安装减流阻渣设施和改进网箱设置方法，能有效地避免江河汛期急流、浮渣对渔业生产的不利影响。

The recommended principal dimensions of a cage-ship are as follows:the length between theperpendiculars L = 31.30～40.50,the moulded breadth B=5.50～7. 00,the moulded depth H=1.30～1. 70,the draft T=1.05～1.44,the water piane coefficient β=0.975～1.000,andthe block coefficient δ=0.85 0-0. 9 00.The form 0f a cage-ship is similar to that of a non-powered barge. The water surface of a cage-ship is in the range of 90 to 180 m￣2.Water exchangeis realized through a metal net or through holes made in the ship hull.Two tendencies ex1st in Cage-ship building at the present time:one is that for larger dimensions and higher cost, and the otheris that for lower cost, making use of old barges. The installment of facilities for retarding currentvelocity and keeping drafting residues away and the improvement of the methods of net-cagearrangement may overcome the negative influence of torrent and drafting residues in the floodseason on the cage-ships.