| Author | Jedsada Ketheng |
| Call Number | AIT Thesis no.AQ-12-04 |
| Subject(s) | Low-protein diet
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| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Aquaculture and Aquatic Resource Management, School of Enviroment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. AQ-1-04 |
| Abstract | To determine the effects of dietary protein levels, initial body weight and their interaction on growth, survival, feed utilization and carcass composition of Spotted Featherback fry and fingerling, a feeding trial was conducted for 10 weeks. Fish were cultured in 60- L glass aqua ria with a bio-filter system in an indoor hatchery, grouped into two sizes based on weights : fry ( 0.75± 0.10 g) and fingerling ( 4.87± 0.42 g). Diets containing 30, 35, 40 and 45% crude protein (CP) were fed to satiation ( ad l iblitu m ) with 3 replications per dietary treatment. Fish growth was significantly affected by initial body weight, dietary protein levels and their interaction ( P ˂ 0.05) . Regression analysis of fish growth showed a positive relationship to dietary protein levels, i.e. fish growth increased in line with dietary protein levels. The highest final weight, length, batch weight, daily weight gain and specific growth rate were obtained at 45% CP and 40% CP in fry and fingerling respectively ( P ˂ 0.05) and a regression analysis (R 2 = 0.9751) of final weight indicated that 41% CP was the optimum dietary protein level for fingerling. The poorest growth rates were obtained in both size groups at 30% CP. The condition factor was significantly affected by the dietary protein level only, while the survival rate was significantly affected by both initial body weight and dietary protein levels. Feed conversion ratio ( FCR ), feed intake (FI) and protein efficiency ratio ( PER ) were significantly affected by initial body weight, dietary protein levels and their interaction ( P ˂ 0.05), while the protein conversion efficiency (PCE ) was significantly af fected only by the dietary protein level and their interaction. Optimum FCR and FI were observed at 45 % CP and 40 % CP in fry and fingerling respectively. The lowest PER and PCE of both size groups of the fish were obtained at 45% CP whereas, also in both size groups, the poorest feed utilization grades were obtained at 30% CP. Moisture, ash, crude protein and crude lipid contents of the whole-body fish carcass were significantly affected by initial body weight and dietary protein levels, while their interaction affected only moisture and crude lipid levels. |
| Year | 2012 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. AQ-12-04 |
| 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 | Aquaculture and Aquatic Resources Management (AQ) |
| Chairperson(s) | Yakupitiyage, Amararatne |
| Examination Committee(s) | Gallardo, Wenresti G.;Bhujel, Bam C.;Dabbadie, Lionel |
| Scholarship Donor(s) | Royal Thai Government Fellowship |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2012 |