An on-farm trial to investigate feeding strategies for Nile tilapia (Oreochromis niloticus) broodfish | |
| Author | Theapparath Ungsethaphan |
| Call Number | AIT Thesis no. AE-95-27 |
| Subject(s) | Fishes--Feeding and feeds 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 | The effect of three feeding rates of 0.5, 1.0 and 1.5% body weight per day at two feeding frequencies (once and twice daily) on the reproductive and growth performance in Oreochromis ni/oticus was studied on a commercial farm in Prachinburi province, eastern Thailand. Female broodfish \average initial body weight of 59 g) were stocked in 5 m 2 hapas at a densit~ of 20 fish per m . After 10 days of conditioning females were stocked with males in 40 m hapas at a total density of 5 fish per m 2 , at a female to male ratio 1: 1, for a 5 day spawning period. There were no significant differences (P>0.05) in seed yield produced between feeding frequency once and twice daily at a similar feeding ration. Results showed that females fed at feeding rate 1.0% body weight once daily, produced seed yields of 53.2 total seed/m 2 spawning hapa/day which were significantly higher than those fed at low feeding rate (0.5% body weight) once daily (produced seed yields of 42.7 total seed/m 2 spawning hapa/day). Nevertheless, there was no significant difference between the high feeding rates (1 .0% and 1.5% body weight). There was no significant difference in clutch size and survival to swim-up fry of yolk-sac fry among the treatments. Females fed at the high rates (1.0% and 1.5% body weight) grew significantly faster than females fed at a low rate (0.5% body weight). The partial budget analysis and marginal rate of net return (MRNR) indicated that the strategy of feeding 0.5% body weight twice daily gave the best economic performance for tilapia broodfish management under the conditions of the trial. |
| Year | 1995 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Little, David C.;Yakupitiyage, Amararatne |
| Examination Committee(s) | Hambrey, John |
| Scholarship Donor(s) | Royal Thai Government |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1995 |