| Author | Boonsong Srichareondhum |
| Call Number | AIT Thesis no. AE-90-26 |
| Subject(s) | Tilapia
Fishes--Feeding and feeds
|
| 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 | Three experiments were carried out to investigate the
effects of various zooplankton groups , sizes and densities on
feeding efficiency and growth of various sizes of juvenile
tilapia (Oreochromis niloticus). The electivity index shows
all fry sizes preferred to select Noina sp. and avoid both
rotifer and copepods . The electivity index for large Noina
increased with increasing fry size, but that for small Noina
was less variable . The intensity of size selection and
distribution of ingested prey length also increased with
increasing fry size, but the relation to prey density factor
varied with fry size .
The fry feeding rate on rotifer, Moina and copepods
increased with increasing fry size. The optimum prey density
on rotifer was 16, 32 and 64 ind./mL for 1-cm, 2-3 cm and 4 - 5
cm fry, respectively. However, there was no difference in
feeding rate on Naina for fry of 1 to 3-cm size, with the
prey density ranged 0.5-5 ind./mL; the optimum density for 4 - 5
cm fry was 7 ind./mL. Copepods density did not affect the
ingestion rate for 1-cm fry, but reached to the highest
density of 7 ind./mL for 4-5 cm fry. However, the optimum
copepods density for 2-3 cm fry was found at 2 ind . /mL .
The field feeding experiment on rearing fry with
different feeds (natural food, concentrated zooplankton and/or
artificial feed) shows that fry reared on natural food
(resembling pond condition) obtained the highest growth rate,
and addition of concentrated zooplankton did not enhance the
growth . Fry fed on combination of zooplankton and artificial
feed attained significantly better growth rate than those fed
with either component alone. Fry survival was ranged from 96
to 98 % and was significantly higher in treatment with
combination feed than artificial feed alone. |
| 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) | Lin, Chang Kwei |
| Examination Committee(s) | Yakupitiyage, Amararatne ; Knud-Hansen, Christopher F.
|
| Scholarship Donor(s) | Danish International Development
Agency (DANIDA)-Royal Government
of Denmark |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1990 |
