| Author | Jirachai Juntana |
| Call Number | AIT Thesis no. AE-90-27 |
| 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 | As one component of a two part study, a survey of tilapia
fry production in Udonthani province found that all private fry
producers mainly produced carps, mainly Silver barb (Puntius
gonionotus), mrigal (Cirrhinus migrala) and Rohu (Labeo rohita)
which approximately 79.5 percent total fry production. Only a
half the farms accounted for produce tilapia due to the much
lower production in producing tilapia fry than carps.
In mass incubation experiments with Nile tilapia at AIT,
the stocking density of seed were not observable effect on
hatchability and did not relate to survival to swim- up fry,
however the very high stocking density of seed obtained the
better hatching rate. Atleast 58,677 seed (253.72 g . )/l can be
successfully incubated by using the down-welling incubator made
from plastic solf- drink bottle. There were not significantly
different in hatchability and survival to swim-up fry but highly
significant difference in weight of seed ,hatched fry and swim-up
fry between broodfish classes (Small, Medium and large).
Hatchability, hatched fry weight, swim-up fry weight and survival
to swim- up fry were highly relationship to seed weight (r = 0.54,
r = 0 . 84, r = 0.80 and r = 0.32 respectively.) and the weight of
swim- up fry were also related to weight of hatched fry ( r =
0.81). Survival to swim-up fry were related to hatchability (r
=0.34). Moreover there were highly significant difference in
hatchability and ·survival to swim-up fry between seed stages, the
greatest hatchability and survival to swim-up fry from stage 2.5.
Hatchability were observable effect within the different
broodfish management regime, in green water system had greater
hatching rate than clear water system (P<0.05). However survival
to swim-up fry were not related to the system design. |
| Year | 1990 |
| 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) | Little, David C.
|
| Examination Committee(s) | Machintosh, Donald J. ;Waibel, Hermann
|
| Scholarship Donor(s) | Overseas Development Administration (British) |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1990 |