Thử nghiệm nuôi Chaetoceros với một số môi trường đơn giản trong phòng thí nghiệm

The necessity of a great supply of microalgae for various aquatic larvae stages generated an intensification of studies concerning the development of alternative mediums to reduce the cost of natural and artificial mediums previously in use, which were expensive due to the use of chemical substances of high commercial value. So, this study were carried out to test the growth of Chaetoceros sp. in some simple mediums. The results showed that Chaetoceros sp. could not grow in fish extract medium (both whole fish and by-product). They obtained the highest density around 1.986.000 ± 105.000 cells.ml-1, 1.511.000 ±100.000 cells.ml-1, 1.003.000 ± 130.000 cells.ml-1, 983.000 ± 380.000 cells.ml-1, 292.000 ± 54.000 cells.ml-1 in mediums of NPK fertilizer, Walne, E, chicken manure and fish extract respectively with the initial density of 100.000 cells.ml-1; salinity of 25ppt. When changing the initial density about 200.000 cells.ml-1 and sanility of 15ppt, the highest one got 3.169.000 ± 299.000 cells.ml-1. Generally, Chaetoceros sp. could developed in NPK fertilizer medium with concentration of 0,08-0,12 g.l-1 and salinity of 15-25 ppt but adding silic.