Shrimps appeared less active in strong light than in lower light intensity
(Zhang et al., 2006). The activity of hormones involved in metabolism
increased when the shrimps are under strong light (Hoang
et al., 2003). The increase in hormone activity may accelerate the process
of conversion of food to body tissue, but on the other hand, may
increase energy expenditure. Because of the difference in the degree
of change in light intensity, the effect on behavior and hormone secretion
may differ among the different treatments. In treatment FL1
of our experiment, the deleterious effects may be stronger than the
beneficial effects on shrimps, so the FCEd was lower.