Arinah Masli (2015) Effects of different light intensities on survival and growth of Asian seabass, Lates calcarifer larvae. Masters thesis, Universiti Malaysia Sabah.
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Abstract
The effects of different light intensity on Asian seabass, Lates ca/carifer larvae were studied in two stages: early (1 to 10 days after hatch, d AH) and late larval (14 to 42 d AH). The larvae were reared at 0, 500, 1,000 and 2,000 Ix light intensities to investigate survival, cannibalism, growth, feeding, nutritional status and retina development. Results in early larval stage showed that survival was significant (P=0.02) in 1,000 Ix (85.71±10.4 %) compared to 500 and 2,000 Ix which are 65.23±18.32 % and 36.97±3.98 % respectively. Significant different (P=0.01) growth of larvae was recorded between 500 Ix (6.30±0.4 mm) and 2,000 Ix (3.56±0.36 mm) but insignificant different (P=0.07) with 1,000 Ix (6.13±0.1 mm). Absorption of yolk sac was showed significantly high (P=0.02) in O Ix than other treatments 0.90±0.15 x10-1 mm2. Oil globule volume of Asian seabass in O and 500 Ix was consistent from O until 24 h AH (3.27x 10-1 mm2 for both of the treatments). In feeding incidence and feeding intake at 10 d AH, no significant different detected in all treatments.In morphometric ratio, the most significant changes were observed in body length ratio (BH: BL) where the larvae in 500 and 1,000 Ix had moderate nutritional status. No significant different (P=0.22) in gut epithelium height (,un) in 1000 and 2000 Ix (11.00±2.2 µm and 12.00±1.6 f-Kn respectively). Morphology and retinal development in 2,000 Ix and 500 Ix indicated adaptive mechanisms. In the late larval stage, the highest survival was observed in 1,000 Ix (90.00±10.0 %) but insignificant (P=0.23) in 500 Ix (83.00±15.3 %). Cannibalism rate was significantly high (P=0.01) in O Ix (60.0±1.0 %).Meanwhile, growth of the larvae in 1,000 and 2,000 Ix (22.0±5.0 mm and 22.8±3.7 mm respectively) showed significantly high (P=0.03) than O and 500 Ix (12.1±1.9 mm and 16.0±1.3 mm respectively).High significant in weight gain (P=0.02) was observed in 2000 Ix (0.30±0.1 g) compared with other treatments (0 Ix: 0.16±0.1 g; SOO Ix: 0.15±0.0 g; 1,000 Ix: 0.21±0.1 g).Thickness of photoreceptor layers (µ,,) showed significant different and indicated adaptive mechanisms. The present study proved that light intensity gave effects to the larvae and stages dependent ( optimum light intensity in early and late larval stage were 1,000 Ix and 500 to 2,000 Ix respectively). The present study provided valuable insights into new techniques in larval culture and the implications of study highly valuable and relevant as light intensity can easily manipulated at a relatively low cost, decreased cannibalism and increased survival as well as profits in aquaculture industry.
| Item Type: | Thesis (Masters) |
|---|---|
| Keyword: | Asian seabass, Lates calcarifer larvae, Light intensity |
| Subjects: | Q Science > QL Zoology > QL1-991 Zoology > QL605-739.8 Chordates. Vertebrates > QL614-639.8 Fishes |
| Department: | INSTITUTE > Borneo Marine Research Institute |
| Depositing User: | DG MASNIAH AHMAD - |
| Date Deposited: | 26 Jan 2024 15:18 |
| Last Modified: | 26 Jan 2024 15:18 |
| URI: | https://eprints.ums.edu.my/id/eprint/38026 |
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