舟山渔场深水网箱养殖环境前期评估

Previous evaluation and prediction for cage's aquaculture in offshore environment of Zhoushan Fishing Ground

对舟山渔场深水网箱养殖的五个重要基地的自然环境状态、网箱分布情况、风浪流基本情况、海水理化因子指标等进行了连续4 a的动态观测,结果表明:5个主要深水网箱养殖海区的自然环境条件优越,海区有天然的屏障物,可避大风浪,海水水质除营养盐外均属于一类或二类水质标准,底质基本符合沉积物一类标准,养殖环境状况良好,适合发展深水网箱养殖。此外海区环境变化监测结果表明:养殖前期,深水网箱养殖使得海区环境的营养盐提高了4.3倍,2005年后,增加的趋势得到了明显的抑制,趋于平稳。因此,深水网箱养殖需要通过加强水质管理,合理布局,科学养殖等措施稳步持续发展。

Five important cage＇ s agriculture bases were observed on natural environmental, distribution of net cages, wind, wave and current, physical and chemical factors for 4 years offshore. The results showed that there is the good agriculture environment in the five bases, and are adequate to develop the cage agriculture offshore. Because there is the advantage in natural environmental condition, the sea area can anti wave and wine for crud barrier. Except nutrition salt index, the seawater quality reached the water quality standard Ⅰ or Ⅱ grade, and the sediments basically reached the sediment standard Ⅰ grade. The changes of environment could impact the degree of agriculture in seawater environment. Above all, for the sake of the cages continuous development, some measures should be taken, such as water quality management, reasonable distribution, scientific agriculture.