| Author | Dato, Cristina Rowena S. |
| Call Number | AIT Thesis no. AE-93-22 |
| Subject(s) | 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 | The mineral requirement of Nile tilapia, Oreochromis niloticus was evaluated under a supplementary feeding regime. An experiment was conducted in earthen ponds fertilized with urea and TSP at rates of 4 kgN and 1 kgP ha-I day-I , respectively. Sex-reversed Nile tilapia (23g +0.69) were stocked in 1 m3 net cages at 30 fish m-3 . The fish were fed for two months with experimental diets containing all essential minerals (complete diet) and 11 other diets where specific macro-minerals (i.e. calcium and phosphorus, magnesium, sodium, and potassium) and microminerals (i. e. iron, zinc, manganese, and iodine) were individually omitted from the complete diet. The effects of deletion of these minerals from the complete diet (control) were evaluated using growth performance, feed utilization efficiency and final carcass composition as indices. Results indicated that supplementation of all evaluated minerals were not necessary. Comparable growth performance and feed utilization efficiencies with the control diet can be achieved without providing the other minerals except for dietary phosphorus (P) and calcium (Ca). The fish fed P- and Ca-deficient diets had significantly (p < 0.05) poor growth (daily weight gain, DWG= 1.17 g/day, and relative growth rate, RGR=54.5 mg/g/day) and poor feed utilization efficiency (apparent feed conversion ratio, FCR = 1.8, and true protein efficiency ratio, PER = 1.2) than the complete diet (DWG= 1.48 g/day, RGR=64 mg/g/day, FCR=1.38, PER=1.7). This study suggests the possible uptake of minerals from water and contribution of natural food to fulfill most of the mineral requirements of Nile tilapia, except, for phosphorus and/or calcium. No gross deficiency symptoms were evident in any of the treatments. |
| Year | 1993 |
| 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) | Yakupitiyage, Amararatne |
| Examination Committee(s) | Edwards, Peter ;Lin, Chang Kwei
|
| Scholarship Donor(s) | The Government of Netherlands; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1993 |