Fig. 14. niagram of distribution of trophic regions on the Pacific 

 Ocean Floor. Eutrophic regions: 1, Peripheral pericontinental ; 2, 

 Peripheral oceanic; 3, Equatorial; 4, Northern and southern oligotrophic 

 regions; 5, fi, Boundaries of regions (symbols same as in Fig. 13); 7, 

 Continental slopes and under-water rises; 8, Outer boundary of 

 accumulative trains (same as in Fig. 13) (not over 300 m deep); 9, Deep- 

 water trenches (over 6000 m deep). 



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