Effects of dietary protein levels on growth and reproduction of Nile tilapia (Oreochromis niloticus, linnaeus) | |
| Author | Nguyen Anh Tuan |
| Call Number | AIT Thesis no. AE-86-30 |
| Subject(s) | Tilapia Fish-culture |
| Note | A thesis submitted in partial fulfillment of the requirements for t he degree of Master of Science. School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | The dietary protein requirements of Nile tilapia (oreochromis niloticus). at pre-spawning and. spawning stages were investigated .• Five experimental diets containing protein levels ranging from 203 to 50% with an interval of 7.5% were tested . The experiment, divided into two stages, was carried out f or a period of 5 months. In the first stage , the pre-s pawning stage , fish were fed experimental diets for 6 weeks, at the end of this period the dietary protein requirement for growth was determined in terms of weight gain , food conversion ratio, protein effic1.cncy ratio, apparent net protein. utilization anti protein digestibility. On the basis of growth response , a diet containing about 27.5%-35% protein appeared to be the optimum diet, although t here were no significant differences among the diets except diet I (20% protein) . For the second stage , the feeding trial was extended and the experimental fish continued to be fed with the in diets , and their reproductive performances were determined in terms of onset of spawning , frequency of spawning , egg size (volume and weight, hatchability and fecundity. on the bash ; of reproduction responses fish fed diets containing low and medium levels of protein (20%, 27 . 5% and 35%) h ad. a higher fecundify but smaller eggs, while those fed diets containing higher levels o f protein (42.5% and. 50%) produced a smaller number of eggs which were larger a nd heavier. Fish fed experimental diets containing high levels of protein (42.5% and 50 %) spawned earlier but less frequently while the fish fed low a nd medium levels of dietary protein (20%, 27.5% and 35%) s pawned later but more frequently in the same period. In terms o f growth performances in the spawning stage , the diet containing 35% protein appeared. to be the optimum diet for the higher percentage weight gain and daily weight gain compared with the Iow protein diets (20 % a nd 27. 53) but. was not significantly different with the high protein diets (42 . 5% and 50%) . |
| Year | 1986 |
| 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) | Wee, Kok Leong |
| Examination Committee(s) | Edwards, Peter ;Lin, Chang Kwei |
| Scholarship Donor(s) | The Japanese Government |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1986 |