Compensatory growth of Nile tilapia (Oreochromis niloticus) | |
| Author | Yuan, De Run |
| Call Number | AIT Thesis no. AE-93-36 |
| Subject(s) | Tilapia Fishes--Growth |
| Note | A thesis submitted in the partial fulfillment of a requirements for the degree of Master of Science. |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. AE-93-36 |
| Abstract | Two feeding trials were conducted, one in a recirculating water system (the first trial) and the other in a fert ilized pond (the second trial) to investigate the effects of restricted ration and duration on t he subsequent growth of sexreversed Ni le t ilapia during the fol lowing satiation feeding period. The factori a l design consisting of 3 leve ls of a restricted ration (starvation, 13 body weight/day and 23 body weight/day) and 4 leve ls of a restricted durat ion (0, 2, 4, 6 weeks) was employed in the first trial in a recirculating water system. Each of 12 treatments (restricted ration level x restricted duration leve l) with a total period of 12 weeks consi sted of two parts, the restricted feeding period and the subsequent satiation feeding period. ANOVA s howed that the daily weight gain in the satiation feeding period (DWGs) was significantly affected by the restricted ration levels, but the effect was a lso inf luenced by t he restricted duration l evels. At the leve l s of starvation and the feeding rate of 13 body weight/day, restr i ction for 2, 4, and 6 weeks had t he s imilar DViGs to that of continuous feeding (O week restriction). At the restricted ration level of 23 body weight/day, D\l.Gs of restricted feeding for 2, 4, or 6 weeks were significantly higher than that of continuous feeding. Compensatory growth effect occurred at this restricted ration level. Compared with the continuous feeding, the r estricted duration of 2, 4 and 6 weeks had bet ter feed ut i li zation. Feeding rate in the sat iation feeding period showed a continuous increase as increasing the restr i cted duration level and reducing t he restricted ration level. Approximate analyses of fish carcass in the first trial showed t hat with the increase of restricted duration level and the decrease of restricted rat ion level, lipid content decreased greatly. The content of protein and ash, however, main ly affected by t he restricted durat i on. Elongat i ng the restricted durat ion increased the content of protein and ash . The second trial revea led that non-supplementary feeding for 2 to 10 weeks had no de leterious eff ects on s ubsequent fish growth (i.e . no stunting) and feed utilization. Carcass analyses, however, showed that lipid content were signifi cantly reduced by the non-feeding periods more than 6 weeks. No compensatory growt h effect happened in the second trial . Feed restrict i on can be used in fert i li zed ponds to contro l fi ngerling sizes in hatchery conditions to meet t he changing demands of markets at low cost. It also can be used in the grow-out stage of fish production to reduce the feed cost and to avoid the high lipid content in fish carcass. |
| Year | 1993 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. AE-93-36 |
| 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) | Littleion, David;Phillips, M. J. |
| Scholarship Donor(s) | ADB - Japan |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1993 |