Direct and indirect nutritional values of the duckweed Lemna as feed for Nile tilapia | |
| Author | Santos, Emelita V. |
| Call Number | AIT Thesis no. AE-87-37 |
| Subject(s) | Fishes--Feeding and feeds Animal nutrition |
| 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 direct and the indirect nutritional effects of feeding fresh duckweed (Lemna perpusilla) to Nile tilapia (Oreochromis niloticus) were studied in outdoor recirculating and static water concrete tanks at feeding levels of 2, 4 and 6% fish body weight /day (feed dry weight basis, fish wet weight basis) with a control treatment u sing commercial pelleted feed for herbivorous fish at a 5% level. Fish growth was significantly higher at t h e 6% feeding level of Lemna compared to the control. Total percentage weight gains of 277, 629 and 710% were obtained for individual fish at 2, 4 and 6% feeding levels of fresh duckweed in the recirculating water system, respectively, in which only direct nutritional effects of duckweed consumption were possible. Fish in the static water system exposed to natural food due to the indirect contribution of the decomposition of uneaten Lemna an d fish faeces had better growth than fish fed with Lemna only. Growth of fish was limited however in the static water system, by poor water quality, particularly dissolved oxygen deficiency due to decomposition of uneaten duckweed. The apparent protein digestibility obtained in the study ranged from 87. 2% to 90. 9% showing that Nile tilapia effectively digested Lemna. |
| Year | 1987 |
| 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) | Edwards, Peter |
| Examination Committee(s) | Wee, Kok Leong ; Lin, Chang Kwei |
| Scholarship Donor(s) | Government of Australia |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1987 |