| Author | Xu, Hui |
| Call Number | AIT Thesis no. AE-89-41 |
| Subject(s) | Tilapia
Fish-culture
|
| Note | A thesis submitted in partial fulfilment of the requirements
for the degree of master of science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | An experiment was conducted for a period of 4 months to compare the
production of tilapia <Oreochromis niloticus) cultured in open pond, cage and
pen in 3 semi-intensive ponds. Chicken manure were applied to the ponds at
the rate of 250 kg chicken manure (dry weight> I hectare/week and urea was
added to make up the desired N:P ratio of 5:1 throughout this experiment.
Fish production, growth and nutritional values of pond inputs, pond water
quality, detritus quality and organisms were determined during the experiment.
The mean daily fish weight gain in pond, cage and pen were 0 .94, 0.93 and
0.97 g/fish/day with mean survival of 90.5%, 93.9% and 90.3%, respectively. The
extrapolated total net yield of Nile tilapia was 5586 kg/ha/yr in the pond,
5307 kg/ha/yr in the cage and 5953 kg/ha/yr in the pen. However, t here was
no significant difference for fish production and survival rate in those 3
treatments.
Analysis of fish stomach contents showed that similar fish diet was
found in three cultural systems. They consumed mainly phytoplankton, of
which the dominant species were Microcystis sp and Anabaena sp. The ranges of
pond water quality were as follows: total ammonia 0 .38 ±0.10- 1.61 ±0 .15 mg/l;
temperature 28.1-31.4 °C ; pH value 8.10-9.12 ; dissolved oxygen from dawn to
sunset 2. 1 ±0.4-8.6 ±0.5 mg/l. The phytoplankton biomass in three ponds
increased with time and the highest biomass was 19.10 ±7.02 mg/l (dry wt). · The
mean detrital deposition to pond bottom estimated for dry matter and organic
matter were 333.5 ±11 3.4 g/ m2 /day and 292.72 ±105.33 g/m2 /day, respectively.
The mean deposition of chlorophyll-a in detritus was 52 ±4.5 mg/m2 /day. |
| Year | 1989 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Lin, Chang Kwei
; |
| Examination Committee(s) | Little, David C. ;Knud-Hansen, Christopher F. ; |
| Scholarship Donor(s) | The British Council (TCTA); |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1989 |
