| Author | Begam, Rowshan Ara |
| Call Number | AIT Thesis no. AE-94-20 |
| Subject(s) | Fish-culture
|
| 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 | Rice fish culture is gaining world-wide attention from all concerned due to the fact that
a technological limit may sometimes reach to further intensification of rice cropping systems.
Thus, the fa1mers will have to look for more diversified practices to meet dietary and income
demands. Furthermore, population and other factors are creating increased pressure on land use.
For this reason, production of fish on rice lands is a viable option for increasing farm cash and
protein levels. In this respect much attention has not yet been given to study the effect of
different environment on the growth, yield and economy of rice fish culture.
The objectives of the study were (1) to assess the effects of rice cultivation : open water
fish culture area ratio on production of tilapia (Oreochromis niloticus), (2) to determine the
effects of rice cultivation : open water area ratio on environmental conditions for fish in rice
fields, (3) to prepare a nutrient budget for culture of Oreochromis niloticus in these rice-fish
environments, and (4) to dete1mine the economic returns under the different rice/fish cultivation
conditions.
The research design (completely randomized) involved five treatments of rice fish
environment with no open water fish culture area, 25%, 50%, 75% and 100% open water fish
culture area maintaining water depth of 15 cm in the rice area and 50 cm water depth in the open
water fish culture area. Each treatment had three replicates. Concurrent culture of 0. niloticus
with stocking size of 5-7 cm and stocking density of 4 fry/m2 and RD23 variety rice was made
for about 93 days in one cycle of operation.
The results show that fish growth, yield, biomass production and survival rate significantly
increase with the increase of the open water fish culture area ratio; rice yield significantly
decrease with the increase of open water fish culture area ratio; there is no adverse environmental
effect; nitrogen and phosphorus utilization efficiency is the highest with no open water fish
culture area and lowest with no rice area. Although fish growth and yield significantly increase
with the increase of open water fish culture area ratio, but these are not economically attractive.
Economically, rice fish culture with 0. niloticus with no open water fish culture area, is the most
profitable and attractive for farmers. |
| 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) | Phillips, M. J.
|
| Examination Committee(s) | Little, David C. ;Sununthar Setboonsarng
|
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1994 |