The role of zooplankton in feeding and growth of juvenile tilapia (Oreochromis nil | |
| 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 |