网箱养殖N、P物质平衡研究--以广东省哑铃湾网箱养殖研究为例

通过借鉴封闭系统水产养殖物质平衡的观测思路,把网箱当作黑箱,对广东省哑铃湾一个典型鱼排网箱养殖的物质平衡进行了观测和计算,建立了网箱养殖N、P物质平衡方程.结果表明,网箱养殖N、P物质的利用率比基塘、虾池等封闭系统要低得多,而且网箱养殖N、P的输入主要是投饵造成的,而输入的N、P物质,在水环境中发生一系列的迁移、转化,除了10%左右被利用收获外,其余的大部分被水动力带走,污染临近水域,还有一部分则沉积在底泥中,形成内源污染.

Research on material balance of N and P in cage culture--Take example for cage culture in Yaling Bay,Guangdong

In order to study the material balance of cage culture in loop system, the cage was regarded as black box, material balance of cage culture in a typical steak in Yaling Bay, Guangdong, have been emamined and calculated using a formulated N,P material balance model. The result shows that utilization rate of N and P in the cage culture is much lower than that of closed system such as base pond and shrimp pond. In addition, as for the, the inputs of N and P in cage culture is mainly from baiting casting. After undergoing a series of transprot and transformation in water environment, only about 10% is utilized, and the majority part of N and P is carried away by hydropower, causing pollution in the neighboring waters, and the rest of N, P is deposited in bed mud, forming endogenesis pollution source.