The effect of varying light color on giant river prawn (Macrobrachium rosenbergii) larvae and juveniles | |
| Author | Goshorn, Randy Jay |
| Call Number | AIT Thesis no.AQ-09-04 |
| Subject(s) | Shrimps Macrobrachium rosenbergii |
| Note | A thesis submitted in partial fulfillment of the re quirements for the degree of Master of Science in Aquaculture and Aquatic Resources Management, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. AQ-09-04 |
| Abstract | The visual development of Macrobrachium rosenbergii is poorly understood. The purpose of this study was to evaluate the effects of varying light color on the growth and survival of Macrobrachium rosenbergii larvae and juveniles. Of the two experiments conducted, the first one evaluated the effect of light color on survival rate, metamorphosis rate, mean weight and time required for Macrobrachium rosenbergii larvae to reach post-larvae (PL) stage. Eighteen 30-L glass aquariums were used and the volume of each tank was maintained at 20 L. Larvae were stocked at a density of 30 larvaelL for a total of 600 larvae/aquaria. Light color treatments evaluated were white light, red light, UV light, green light, indirect natural light and no light (the last two as controls). Larvae were fed Artemia nauplii and a custard egg mixture. Overall survival was low during the experiment and tests indicated that the disease Macrobrachium rosenbergii nodavirus (MrNV) was present during the larval rearing phase. The survival rate was significantly higher (P:S0.05) in no light (14.0%) than indirect natural (8.9%), red (7.2%), white (4.4%), green (2.4%) and UV light (1.7%) respectively). However, light color had no effect (P>0.05) on the fmal weight of PL or days required to metamorphosis. There was a significant relationship between both irradiance (r²=0.96) and light intensity (r²=0.73) and survival. As irradiance and light intensity increased survival decreased. The results indicate light color had a negative effect on the survival, growth, and time to metamorphosis of M rosenbergii larvae. The control treatment of no light obtained the highest survival rate and the shortest time to metamorphosis. Experiment two evaluated the effect of light color on survival, growth and feed conversion ratio of Macrobrachium rosenbergii juveniles. Fifteen-day old post larvae were stocked into eighteen 20-L aquaria at a density of 3000 PL/m³ with a plastic artificial substrate added to achieve a density of 150 PL/m². Light color treatments were indirect natural, white, red, UV, green and no light. Juvenile prawn were fed High Grade 9041 commercial prawn diet (40% protein, lipid 3%; CP brand) according to a feeding chart. Within 7 days, 100% mortality was observed in all 3 replicates of the UV treatment. After 45 days, survival rates were higher (P≤0.05) under indirect natural light and red light (74.4±1.5 % and 73.9±2.8 % respectively) compared with no light treatment (66.l±0.6 %). The survival rate under white (71.1 ± 1.1 %) and green light (67.2± 1.5%) were not significantly (P>0.05) different from all other treatments. The mean individual weight of juveniles was higher (P≤0.05) under green light (0.37±0.01 g) than indirect natural light (0.29±0.02 g). The mean weight (g) of juvenile in no light (0.35±0.01), white light (0.36±0.03), and red light,(0.34±0.00) were not different from all other treatments. The feed conversion ratio (FCR) of juveniles was lower (P≤0.05) under white light (1.5±0.1) and red light (1.5±0.1) than indirect natural light (2.0±0.2). The FCR in no light (1.9±O.I) and green light (1.6±0.1) respectively) were not different(P>0.05) from all other treatments. This study indicates that light color has an effect on survival, growth and feed conversion ratio of M rosenbergii juveniles. |
| Year | 2009 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. AQ-09-04 |
| 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) | Gallardo, Wenresti G. |
| Examination Committee(s) | Yakupitiyage, Amararatne;Bart, Amrit N. |
| Scholarship Donor(s) | AIT Fellowship |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2009 |