| Author | Rana, Sushila K. C. |
| Call Number | AIT Thesis no.AQ-03-35 |
| Subject(s) | Nile tilapia -- Nepal
|
| 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 |
| Series Statement | Thesis ; no. AQ-03-35 |
| Abstract | Two experiments were conducted between April and June, 2003 at Tarahara, research center of Nepal Agricultural Research Council (NARC) located at South-east part of Nepal, to investigated the effects of three stocking sizes (10, 15 and 20 g) on the growth sexual maturity, and partial budget of GIFT strain of Nile tilapia ( Oreochromis niloticus). In the first experiment, stocking density of fingerlings was constant (i.e. 2 fish.m-2 ) and in the second experiment stocking biomass was constant ( 40g m-2 ). The ponds were fertilized weekly urea with 28 kg N.ha-1.week-1 and di-ammonium phosphate with 7 kg P ha-1.week- 1. Both trials were conducted simultaneously in two separate ponds over a period of 85 days. In the first experiment, the highest fish growth was achieved when fingerlings were stocked at 15 g (246.7 ± 1.23) and sizes. Pond stocked with lOg (204.3 ± 5.04) fingerling had the lowest growth. Mean fish survival percentage daily weight gain and yields were not significantly different among the treatments. Highest recruit biomass (3.0 ±. 28) and number of recruits (700 ± 57) were collected from the pond stocked with 1 Og fingerlings compared to the treatments stocked with 15g (276 ± 15) and 20g (246 ± 42) fingerlings at harvest. No significant effects on gonad weight, GSI and HIS and partial budget analysis were found among the treatments. In experiment two the highest fish growth rate and mean weight and survival were achieved when fingerlings were stocked at 15 and 20 g were used. While pond stocked with 1 Og fingerlings had the lowest growth rate and mean weight, survival. There were significant differences in daily weight gain between 10 g and 20 g. There were no significant differences in recruit number and weight among the treatments. There were no significant differences in gonad weight, liver weight, GSI, HIS partial budget among the treatments. The two experiments showed differences in growth rate, final mean weight, and fish yield production but recruits number and weight were similar to experiment 1- treatment 1 Og with experiment two. Over 90% of the fish most under the experiment one for 15 and 20 g treatments reached marketable size before sexual maturation. Partial budget estimated excellent return. Results from this study suggest that stocking GIFT strain at 15 g and 20 g results in higher growth rate, fish production and partial budget compared to 10 g and biomass constant experiment. Furthermore culture of the monosex stocks may be not required to produce fish to marketable size (150-200 g). This may be well suited for low-input system and small-scale producers, encouraging the nursery producers to diversifying aquaculture in Nepal and increasing self-reliance. |
| Year | 2003 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. AQ-03-35 |
| 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) | Bart, Amrit; |
| Examination Committee(s) | Yi, Yang ;Mair, Graham; |
| Scholarship Donor(s) | NORAD ;CRSP; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2003 |