赤潮灾害对水产养殖业损失的分级评估

通过分析赤潮灾害损失的构成，建立了一套新的赤潮灾害对水产养殖业损失的评估方法，分别对养殖业的直接经济损失，间接经济损失，赤潮恢复费用等3个方面进行评估，并根据对灾害评估时间要求的不同，将赤潮灾害对养殖业的经济损失评估由粗评到细评，由定性到定量划分为3个等级，即灾前损失预评估，灾时损失评估和灾后损失实评估。最后利用2005年6月发生在浙江南麂列岛赤潮造成水产养殖业灾害损失的实地调查资料，运用建立的分类分级标准进行灾害损失评估。结果表明，此次赤潮属于中型鱼毒赤潮，其直接经济损失为3 100万元，总损失为4 290万元。

The assessment of aquaculture loss caused by red tides

A new evaluation method of the aquiculture loss caused by red tides has been discussed in the present study. By analysing the structure of loss caused by red tide hazard, the aquaculture loss is divided into three types: direct aquaculture loss, indirect aquaculture loss and recovery cost. In addition, based on the different demand of timing, it was also divided into three grades: prediction assessment before hazard, tracking or monitoring assessment during hazard and on the spot surveying assessment after hazard. Finally, a practical example of assessing the loss of red tides occurring in Nanji Island, Zhejiang in June 2005, was given by red tides hazard loss assessment system established above. Its results were as follows: Prediction assessment before hazard: Classification is BR2. Early warning color is orange, and the second emergency measure was taken. Tracking or monitoring assessment during hazard: the direct economic loss is RMB 33 million. On the spot surveying assessment after hazard: the direct economic loss is 31 million. The total economic loss is 42.9 million.