| Author | Balasuriya, Chandrasena |
| Call Number | AIT Thesis no.AE-88-34 |
| Subject(s) | Tilapia
|
| Note | A thesis submitted in partial fulfillment 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 over a period of 210 days to
study the effectiveness of snakehead (Channa striata) as a
controlling preda tor on recruitment of tilapia (Oreochromis
niloticus) in a semi-intensive polyculture pond system with
Puntius gonionotus. The r e were two treatments in duplicate where
200 fingerlings each of tilapia and Puntius were stocked in 200
m2 ponds, Snakeheads were stocked 5 % and 10 % in treatment 1 and
2 respectively as a percentage of tilapia fingerlings stocked.
Buffalo manure, paragrass (Brachiaria mutica ) , water spinach
(Ipomoea aguatica ) and urea were the pond inputs applied at the
same rate throughout this experiment; Rice bran was supplied
during the first two months only.
Fish production and growth, nutritive values of pond inputs,
water quality parameters of pond water and simple economic
analysis for fish subsystem were determine d .
The total net extrapolated yield of 2800 kg/ha/year and 2426
kg/ha/year were obtained from treatment 1 and 2 respectively. The
total yield and individual size of Puntius was exactly same in
both treatments but the total yield and individual size of
tilapia were slightly higher in treatment 1 than in treatment 2,
while snakeheads were grown better in the treatment 1. All the
harvested fish attained marketable size (over 10 cm ) and, the
effect of predatory fish on tilapia recruits was highly
successful in both treatments. Concerning the lower growth of
snakeheads in treatment 2 it could be concluded that 5 % predator
level (treatment 1) is quite enough to control the recruitment of
tilapia for a growing period of 7 months. |
| Year | 1988 |
| 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) | Gartner, Joseph A.
|
| Examination Committee(s) | Wee, Kok Leong ; Peacock, C.
|
| Scholarship Donor(s) | FAO/UNDP |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1988 |