100 μl of 5-HT solution was injected at first abdominal somite of
shrimp at Day 1 and Day 11. After 20 days, the ovarian stage of shrimp was determined by physical observation
using transmission light method and by histological analysis, conducted for further confirmation of ovarian
stages. Oocytes diameter was measured under advance research microscope (Nikon Eclipse 80i) using
NIS-Elements D 2.30 computer software. The mean size of oocytes was analyzed using One-Way ANOVA and
Tukey Test at = 0.05. Results show that there is a significant difference between oocyte diameter of 5-HT
treatment group and control group and no significant difference between both concentrations of 5-HT used.
However, signal of maturation wasobserved from the 5-HT40 group (histological analysis) in 20 days
experiment. This experiment suggests that 5-HT can induce faster maturation in F. merguiensis; however a
further study mus be conducted to find the effect of 5-HT to the seed quantity and quality of F. merguiensis.