Effects of derris root on copepod and artemia population in coexistence at different salinities

Abstract

The study aimed to assess the effect of derris root doses on copepod and Artemia population in coexistence at different salinities under experimental condition.Experiment were carried out with a two-factorial experiment consisted of derris root dose (0.5 ppm, 1 ppm and 2 ppm) and salinity levels (40 ppt, 50 ppt, 60 ppt). Experiment has 9 treatments and each treatment had 3 replicates. Artemia and copepoda was cultured at the density of 120 ind and 100 ind per liter in the same plastic bottle in 7 days to get data on the survival and growth of both species. They were fed with Chaetoceros daily at 400,000 cells/ml. The result at day 7thof culturing showed that two factors (salinity and rotenone) affected on survival of Artemia population. The survival of Artemia was lowest in the combine-culture at 40 ‰ and 0.5ppm rotenone dose despite of copepod densities, but at salinity of 60 ‰ 0.5ppm rotenone dose, the highest survival of Artemia was obtained in the culture Artemia. Although Copepoda survival rate were no significant difference (P>0.05) among treatments, Copepoda population was decreased over 50% compare with initial density.