. Fig. 31. Distribution of eggs of Euphausia superba. The reason for the particular abundance in the Bransfield Strait area may be that tem- perature and salinity or the bathymetric conditions are particularly suitable. For, in the Bransfield Strait and separated from the surrounding seas by submarine ridges rising to within 250-600 m. of the surface, there are extensive basins with soundings from 500 to 2000 m. These basins may be particularly favourable for the production and develop- ment of eggs. One other striking feature of this region which may make it suitable is the homogeneous condit
. Fig. 31. Distribution of eggs of Euphausia superba. The reason for the particular abundance in the Bransfield Strait area may be that tem- perature and salinity or the bathymetric conditions are particularly suitable. For, in the Bransfield Strait and separated from the surrounding seas by submarine ridges rising to within 250-600 m. of the surface, there are extensive basins with soundings from 500 to 2000 m. These basins may be particularly favourable for the production and develop- ment of eggs. One other striking feature of this region which may make it suitable is the homogeneous condition of the water column. Over the shallow ridges the water is almost completely mixed, and even in the deep basins there are only small changes of temperature and salinity with depth. The eggs were found in nets fished through water of which the temperature varied from — I-So to 2-02° C, but the greater number of catches was in water of temperature
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