Abstract:
It is well known that fish vision and spectrumpereceptionare strongly related to
each species natural habitat and ecology. Recent research data clearly indicate that light
spectrum affects farmed fish stress response, physiological status, behaviour, and
consequently growth performance. This study aimed to investigate the effects light
intensities and colors on the survival and morphological changes of Nile tilapia
(Oreochormis niloticus) fry. There were three type of treatment were conducted for 14
days. The first (Tl) and second (T2) was performed by rearing Nile tilapia fry at light
intensity of 150 Ix and 300 Ix respectively in difference types of light colors which are
white, red, and blue light. The third (T3) was rearing Nile tilapia fry under normal
lighting condition as a control. The results showed that there were no significant
differences between influences of light intensities and light colors toward survival rate
and morphological changes (growth and deformities) of Nile tilapia fry. Based on the
result, it is advisable to rearing Nile tilapia fry under white light at either 150 Ix or 300 Ix
under white light color for optimum survival rate. For optimum growth rate, it is
advisable to rearing Nile tilapia fry either under red light at 150 Ix or under blue light at
300 Ix. There are no deformities development been observed during experiment been
conducted. Light spectrum and intensity effects on fish physiological condition require
further research and it is clear that light spectrum and intensity should not be neglected
when artificial light in indoor fish farming facilities is concerned.
