| Author | Bui Chau Truc Dan |
| Call Number | AIT Thesis no.AQ-08-15 |
| Subject(s) | Catfishes--Feeding and feeds--Mekong River Delta (Vietnam and Cambodia)
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| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Aquacu lture and Aquatic Resources Management, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. AQ-08-15 |
| Abstract | The whisker catfish ( Micronema bleekeri ) is a potential culture species in Mekong Delta thanks to high market price and successful induced breeding method, but its nursing techniques still need to be developed. Th ree indoor experiments were carried out to evaluate growth and survival rates of whiske r catfish fry rearing with different feeding regimes and stocking densities. In the first experiment, 48 hrs post-hatch M. bleekeri fry were reared with different live- feeds: Artemia nauplii, Moina sp, Tubifex sp and Chironomus larvae. The fry were fed in excess, 5 times per day from the onset of exogenous feeding up to 21 old days. The results showed that the growth rate of Tubifex –fed fry was significantly higher than other treatments ( P <0.05) Survival rates of fry in Artemia nauplii and Tubifex worm – fed treatments were 80.3% and 82.8%, respectively which were significan tly higher than in Moina and Chironomus – fed treatments ( P <0.05). The second experiment was carried out for 28 days to investig ate the effect of different weaning procedures from live-feed to dry- feed (38% CP of DM) on survival and subsequent growth rates of M. bleekeri fry. The experiment had 6 treatments, including control treatment which fed exclusively on Tubifex worms, and 5 treatments at 0, 1 2, 3 and 4-day of acclimatization per each li vefeed- dryfeed combination changing, respectively. The survival of fry in 0-day treatment was lowest ( P <0.05) but their growth rate was only significantly lower than in cont rol, 3-day and 4-day treatments. There was no significant difference in survival among 3-da y, 4-day and control treatments, although the highest growth occurred in cont rol treatment. This showed that weaning of whisker catfish fry from Tubifex worms to an artificial diet can be achieved effectively with a 3-day acclimation schedule per one cha nge of livefeed - dryfeed ratio if the period of the provision of live Tubifex worms is reduced and the supply of artificial diet is increased. The last experiment was conducted for over 30 days in order to de termine the optimal rearing density for M . bleekeri during stage after weaning to artificial feed up to fingerling. After weaning to dry-feed for 21 days, uniform fry were stocked at di fferent densities: 2 fry/L; 3 fry/l; 4 fry/L; 5 fry/L, and 6 fry/L in 70-L plas tic tanks with 3 replicates. There was no survival difference among treatments ( P >0.05). The growth rate of fry at 2 fry/L, 3 fry/l, and 4 fry/L were higher than in densities of 5 fry/L and 6 fry/L ( P <0.05). Hence, the stocking density of 4fry/L is optimal for rear ing post-weaned whisker catfish fry in terms of growth and survival. |
| Year | 2008 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. AQ-08-15 |
| 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) | Bart, Amrit;Gallardo, Wenresti G.;Bhujel, Ram C. |
| Scholarship Donor(s) | Sweden (Sida) |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2008 |