Abstract:
In the Vietnamese waters, the value of Chlorophyll a concentration ranged from 0.29 to
2.58mg.m-3, average value of 1.20 0.76mg.m-3 for the shallow waters and from 0.05 to
1.24mg.m-3, average value of 0.37 0.37mg.m-3 for the continental shelf waters. In the
offshore, the Chlorophyll a concentration is relatively lower, ranged from 0.13 to 0.24
mg.m-3.
The assimilated carbon index in the waters of Vietnamese continental shelf ranged from
0.84 to 4.25 mgC.mgChl-a-1.day-1, average value is 1.66 0.95 mgC.mgChl-a-1.day-1. In the
culture pools, bay and coastal waters, the assimilated carbon index is highest, average value
of 121.59 25.99mgC.mgChl-a-1.day-1.
Using the Chlorophyll a concentration to assess primary production with the experimental
equation showed that primary production ranged from 100 - 500mg.m-3.day-1 in coastal
waters. In the offshore, primary production value is lower, ranged from 0.07 to 30 mgC.m-3.
day-1.
The studied results argued that ecological conditions in the coastal zone give facility for the
process of primary production and phytoplankton development.
