Nutritional limiting factors in duckweed and cassava leaf meal based diets for Nile tilapia (Oreochromis niloticus) | |
| Author | Li, Yan |
| Call Number | AIT Thesis no. AE-92-56 |
| Subject(s) | Lemnaceae Fishes--Feeding and feeds |
| Note | A thesis submitted in partial fulfilment of a requirement for the degree of Master of Science. |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. AE-92-56 |
| Abstract | Two feeding trials were conducted in recirculating water systems to determine the nutritional limiting factors in cassava leaf meal (CLM) and duckweed (DW) based diets for Nile tilapia. Fish (initial weight of 38.7 ± 0.17) were fed with eight isonitrogeneous diets (28% crud e protein) consisting of a control diet (100% dietary protein from fish meal), one CLM based diet with 50% dietary protein from CLM and 50% from fish meal, four CLM based diets (100% dietary protein from CLM) s upplemented with different combinations of 0.1% of crystalline amino acids (L-Met, L-Phe and LLys), and two CLM based diet with and without supplementation with 5% of soybean oil for 42 days in the first feeding trial. Analysis of growth and food utilization parameters revealed that the main nutritional limiting factor in CLM based diets for Nile tilapia was low dry matter digestibility; the addition of Methionine (Met), Phenylalanine (Phe ), Lysine(Lys), lipid energy did not improve the growth of Nile tilapia. Nutritional limiting factors of Duckwweed based diet were evaluated in the second feeding trial. Fish (initial weight of 32.10 ± 0.13) were fed with eight isonitrogeneous diets (23% crude protein) consisting of a control diet (50% FM and 50% soybean meal as protein source) and one DW based diet with 50% dietary protein from DW and 50% from fish meal, four DW based diets (100% dietary protein from CLM) supplemented with different combinations of 0.1% of crystalline amino acids (L-Met, L-Phe and L- Lys), and two DW based diet with and without supplemented with 8% of soybean oil during the 40 day feeding trial. Analysis of growth and food utilization parameters revealed that the main limiting factors in duckweed based diets for Nile tilapia were low Met content and low TD s. The addition of Phenylalanine (Phe), Lysine(Lys) and lipid energy did not improve the growth of Nile tilapia. |
| Year | 1992 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ;no. AE-92-56 |
| 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) | Amararatne Yakupitiyage |
| Examination Committee(s) | Edwards, Peter;Little, David |
| Scholarship Donor(s) | International Development Research Center (IDRC, Canada) |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1992 |