Strategy of Nannochloropsis
Against
Environment Starvation: Population Density and Crude Lipid Contents
[1] Lecturer at Aquaculture
Department, Faculty of Agriculture, University of Lampung
2
Student at Aquaculture Department, Faculty of Agriculture, University of
Lampung
Received 12 Mei 2013; received in
revised form 24 Mei 2013;
accepted 6 Juni 2013
ABSTRACT
Nannochloropsis sp., an unicellular marine
microalgae, has potential function as a food source for fish larvae and in
chemical industry. Microenvironmental
conditions, especially nitrogen and salinity stress in marine ecosystems, became major factor
affecting the growth of Nannochloropsis
sp.The aim of the experiment was to study effect of different salinities and
nitrogen dosages to the growth and lipid contents of Nannochloropsis sp. cells.The experiment was arranged in
factorial with three replicates. The first factor was salinity (28 ppt and 38
ppt), and the second factor was nitrogen dosage (100% and 50%). Results of the experiments indicated that nitrogen starvation and high
saline concentration
affected
cell density of Nannochloropsis
sp. in different
level. The
results
showed that combination
treatments of nitrogen
starvation and salinity reduced
cell density (treatmant A, B, and D), except in treatment C.
Combination of high salinity and high N dosages resulted ini steady growth of Nannochloropsis sp. These results
suggest that Nannochloropsis
sp. are able to overcome
salinity stress (38 ppt) in the presence of optimum concentration of nitrogen
in the growth cultures.The results also shows that there were no significant
differences
of crude lipid content
between treatments and no correlation between population density and crude
lipid content. These results suggest that no
simple correlation between population density and crude lipid concentration. On the other hand, population density was not the only factor affected
crude lipid concentration in the microalgae
cell.
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