The implications between a regional and whole distribution of the Antarctic krill, Euphausia superba DANA, and its environmental gradients in the summer season were considered. In order to find out the relationship between the geographical distribution of E. superba and its oceanographical gradients, an environmental index was introduced. The environmental index was the integrated value of water temperature from the surface to 200m in depth Z. As the results, the area of the high concentration of E. superba coincided with the area of low values of Q 200 chiefly falling in the range from 0°C to –1.5°C where showed the thick Winter Water, especially the area of the Slope Water and the Shelf Water south of the Antarctic Divergence zone.
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