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Table 1.

Expression of spots and blotches by plaice settled for 15 min on the three backgrounds

Level of expression
Spots     
Background 
12 
Blotches     
Background 
Level of expression
Spots     
Background 
12 
Blotches     
Background 

Each of the six fish was tested twice on each of the three backgrounds;values are the scores for each individual test. Given the balanced design we treated samples as independent using two-sided ϰ2, with Fisher's exact test where appropriate.

There are significant effects of the background. For spots comparing background 1 with combined data for backgrounds 2 and 3, at expression levels 0,1 vs 2,3: P<0.001. For spots comparing backgrounds 2 and 3 at expression levels 0-2 vs 3 P=0.09. For blotches comparing levels 1, 2, 3 separately and expression levels 0,1 vs 2,3: P=0.008.

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