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The possible availability of deep seawater (DSW; seawater under the euphotic layer) and bacteria isolated from DSW (BDS) for the mass culture of food microalga Chaetoceros ceratosporum was investigated. Seawater samples pumped up from a depth of 320m at the kochi Deep Seawater Laboratory in Muroto, Kochi Prefecture, were collected and used for cultivation of C. ceratosporum. Growth rate (ƒE: reciprocal of the dubling time) and maximum cell yields (MCY) of the alga in untreated DSW were 1.25-2.22 (average 1.72).day-1 and 2-11 (average 6) x 105 cells/ml, respectively. When compared with those obtained by ASP6 medium, the average ,ƒEin DSW was about 90% and the values of MCY were 5-20% of those in ASP6. The values of MCY, however, showed a relatively large variance according to the sampling season of DSW. When some BDS were added to DSW, the growth of C. ceratosporum was often stimulated significantly; the ƒE values were 1.82-2.86 (average 2.27). day-1 and MCYs were 4-12 (average 8) x 105 cells/ml. Moreover, the variance of ƒE and MCY according to the sampling season tended to decrease when BDS were added. These results suggest that DSW has a high potential for cultivating food microalgae, and it can be made more stable and effective by adding BDS.

Availability of Deep Seawater and Effects of Bacteria Isolated from Deep Seawater on the Mass Culture of Food Microalga Chaetoceros ceratosporum.