Abstract:

Correlation between the body length and the number of the crystalline cone in the compound eye of the Antarctic krill Euphausia superba Dana was examined.From the samples collected in the late summer, it shows that there is an apparent exponential relationship between crystalline cone and the body length.From the laboratory population, it seems that when the krill shrink, the crystalline cone number does not decrease.The ratio of crystalline cone number to body length offers a method for detecting the effect of shrinking in natural populations of krill.