| Author | Singappuli, Maheeni Samarakoon |
| Call Number | AIT Thesis no.AQ-06-24 |
| Subject(s) | Shrimp culture
|
| 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-06-24 |
| Abstract | This study was conducted to investigate the effects of pure oxygen injection on shrimp
growth performance and water quality parameters in closed intensive shrimp, Litopenaeus
vannamei culture system. The experiment was conducted in twelve concrete tanks (lxlxl
m3
) at stocking density of 50 shrimp m-2 for 81 days. There were four treatments with
triplicates: (1). Continuous aeration with normal air through air blower (Treatment 1); (2).
Continuous normal aeration (same as in Treatment 1) with pure oxygen injection for one
hour from 0500 to 0600 h (Treatment 2); (3). Continuous normal aeration (same as in
Treatment 1) with pure oxygen injection for three hours from 0300 to 0600 h (Treatment
3); and (4). Only pure oxygen injection for four hours from 0200 to 0600 h (Treatment 4).
Experiment was designed as a completely randomized design. Shrimp with mean weight of
about 0.6 g were stocked and fed with commercial pelleted feed during the experimental
period.
Mean shrimp survival rate and net yield were significantly (P<0.05) higher in pure oxygen
injection treatments than the normal aeration treatment (Treatment 1). Mean FCR was
significantly (P<0.05) lower in pure oxygen injection treatments than the normal aeration
treatment (Treatment 1 ). Final mean individual weight of shrimp and mean daily weight
gain was not significantly different (P>0.05) among the treatments. There was no
significant difference in any of the growth parameters among different durations of pure
oxygen injection.
Dissolved oxygen concentrations at critical hours (0000 to 0600 h) were significantly
(P<0.05) lower in treatment 1 than the other treatments. Among pure oxygen injection
treatments, treatment 4 had significantly (P<0.05) higher DO than those in treatment 2 and
treatment 3 at critical hours. The results showed that the highest rate of dissolved oxygen
increase was observed during the first hour of oxygen injection in pure oxygen injection
treatments, and dissolve oxygen increase was moderate during second and third hours of
oxygen injection. Total ammonia nitrogen and unionized ammonia nitrogen concentrations
did not differ significantly (P>0.05) among the treatments. Pure oxygen injection as well as
different durations of pure oxygen injection had significant (P<0.05) effect on nitrite
nitrogen, chlorophyll-a and secchi depth. Mean values of solids (TS, TSS and TSS)
measured during the study was significantly (P<0.05) higher in normal aeration treatment
(treatment 1) than those in the pure oxygen treatments. Also, different durations of pure
oxygen injection had significant (P< 0.05) effect on total suspended solid and total volatile
solids in water.
This study demonstrates that pure oxygen injection can significantly improve slu-imp
survival and yield as compared to the normal aeration in closed intensive culture system.
Furthermore, the study revealed that pure oxygen injection for one hour resulted in similar
shrimp growth, yield as well as pond water quality as those observed in treatment with
three and four hours of pure oxygen injection. The results indicate that pure oxygen
injection for one hour, during the critical hours, could be used as an alternative mode of
aeration in the intensive closed shrimp culture. Finally, this study for the first time
demonstrates the technical feasibility of pure oxygen injection as aeration technique in
closed intensive shrimp culture system. |
| Year | 2006 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. AQ-06-24 |
| 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) | Yi, Yang; |
| Examination Committee(s) | Yakupitiyage, Amararatne ;Thakur, Dhirendra Prasad ;Gallardo, Wenresti G.; |
| Scholarship Donor(s) | Government of Norway (NORAD); |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2006 |