Abstract
Spatial comparison is widely used to assess cage culture impact, which requires accurate evaluation. It is difficult to guarantee that the differences between cage culture zones and control areas are caused by cage culture instead of natural variables, which implies that the control area layout affects impact evaluation. To test this hypothesis, the effect of the control area layout on the impact evaluation of cage culture in Maniao Bay, Hainan, China, was analyzed, during which the total phosphorus content in sediment was used as the environmental indicator, and the difference between the cage culture area and control area was compared through the Mann-Whitney U test. The impact evaluation varied with control areas, which means that the impact assessment is biased by spatial comparison alone. Impact assessments only based on spatial comparison and without removing the bias of the comparison might be necessary reassessed if the homogeneity of the regions compared, such as the cage culture area and the control area, is difficult to meet, and it is necessary to construct a reasonable evaluation system.
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