FATTY ACID PROFILES OF CYCLOPOID COPEPOD NAUPLII Apocyclops panamensis AND THE EFFECTS OF SALINITY CHANGE
Abstract: Lipid and fatty acid
profiles were described for copepod nauplii Apocy clops panamensis from
fertilized brackish water ponds, and after being acclimated to fullsea water
salinity. Mean total lipid content of copepod nauplii collected from ponds
fertilized with inorganic fertilizer combined either with alfalfa meal, rice
bran, wheat bran, and a combination of these fertilizers ranged from 5.66 ±
0.15 to 7.76% ± 0.27%. Non-polar (neutral) lipid fraction of pond copepod
nauplii was a significantly higher percentage of the total lipid content (74.5
± 1.8 - 93.5% ± 1.0%) compared to those of polar lipid (6.5 ± 1.0 - 21.3% ±
1.8%) (P= 0.000). DHA/EPA ratio in neutral lipids ranged from 1.8 ± 0.2 - 2.0 ±
0.1 with no significant differences in three fertilization regimes. DHA was
27.5% ± 0.56% of the neutral lipids and EPA 14.8% ± 0.8%. Acclimation of
copepod nauplii for six hours from brackish to full-sea water salinity reduced
their lipid content and individual dry weight significantly. Mean total lipid
content was reduced 44.2%, non-polar lipid was reduced 46.9% and polar lipid
was reduced 24.4%. Acclimation altered the DHA/EPA ratio, in the neutral
fraction the ratio increased 26.3% but in the polar fraction it decreased 25%.
Keywords: Apocyclops
panamensis; copepod naupii; fatty acid; salinity change
Author: Gede S. Sumiarsa,
Ronald P. Phelps
Journal Code: jpperikanangg070015
