| Author | Bhujel, Ram Chandra |
| Call Number | AIT Thesis no. AE-94-24 |
| Subject(s) | Tilapia
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of
Master of Science, School of Environment, Resources & Development |
| Publisher | Asian Institute of Technology |
| Abstract | Two experiments were conducted to study the effects of night-time illumination
on the growth of Nile tilapia. Sex-reversed male Nile tilapia (Oreochromis niloticus)
fingerlings ranging from 10 to 20 g in weight, were reared in 10 outdoor concrete tanks
for 75 days (Experiment I) to determine the relationship between the intensity of light
(night time illumination) and growth and production of Nile tilapia. The fish were
stocked at 5 fish m2 and fed with floating pelleted feed at satiation level. Five tanks were
covered during night time (18:30 to 06:30 hrs.) and remaining 5 tanks were kept open
24 hours. In each condition 0,1,2,3 and 4 fluorescent tubes were installed in from first
to fifth number of tanks respectively. Fluorescent light was supplied at night time (18:30
to 06:30 hrs.) throughout the experimental period.
There was no significant (P > 0.05) relationship between the intensity of nighttime illumination and Daily Weight Gain (DWG), Net Fish Yield (NFY) or Survival rate.
DWG ranged from 1.1to1.2 g fish-1d-1 under uncovered tank condition and from 0.9 to
1.1 g fish1d1 under covered tank condition. Similarly NFY ranged from 5.0 to 6.5 gm3d-1 and 3. 0 to 5. 7 g m-3d-1 under un-covered and covered conditions respectively.
Survival rate ranged from 84 to 100 % under un-covered condition whereas from 56 to
92 % under covered condition. There was no significant relationship between the intensity
of night-time illumination and the water quality parameters specifically chlorophyll-a,
phaeophytin-a, ammonia-nitrogen, nitrite-nitrogen and nitrate-nitrogen.
For Experiment II too, sex-reversed male Nile tilapia (Oreochromis niloticus)
finger lings with a weight range of 10 to 20 g were stocked at 3 fish m-2 in 8 earthen
ponds and raised for 90 days to evaluate the efficacy of night-time illumination on growth
of Nile tilapia. Night-time illumination was applied under fertilized and supplementary
feeding systems.
DWG ranged from 0.97 ± 0.19 to 2.14 ± 0.08 g fish-1
d1
, however, there was
no significant (P>0.05) difference in DWG. There was no significant (P>0.05)
difference in NFY under fertilized system whereas DWG of night-time illuminated group
had significantly (P < 0. 05) higher NFY than that of control group under supplementary
feeding system which might be due to the difference in survival rate. |
| Year | 1994 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Yakupitiyage, Amararatne
|
| Examination Committee(s) | Edwards, Peter ;Szyper, James P.
|
| Scholarship Donor(s) | British Government |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1994 |