Effects of different light intensities on survival and growth of Asian seabass, Lates calcarifer larvae

Effects of different light intensities on survival and growth of Asian seabass, Lates calcarifer larvae

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,...

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Main Author: Arinah Masli
Format: Thesis
Language:English
English
Published: 2015
Subjects:
QL614-639.8 Fishes
Online Access:https://eprints.ums.edu.my/id/eprint/38026/1/24%20PAGES.pdf
https://eprints.ums.edu.my/id/eprint/38026/2/FULLTEXT.pdf
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spelling my-ums-ep.380262024-01-26T07:18:19Z Effects of different light intensities on survival and growth of Asian seabass, Lates calcarifer larvae 2015 Arinah Masli QL614-639.8 Fishes 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. 2015 Thesis https://eprints.ums.edu.my/id/eprint/38026/ https://eprints.ums.edu.my/id/eprint/38026/1/24%20PAGES.pdf text en public https://eprints.ums.edu.my/id/eprint/38026/2/FULLTEXT.pdf text en validuser masters Universiti Malaysia Sabah Institut Penyelidikan Marin Borneo
institution Universiti Malaysia Sabah
collection UMS Institutional Repository
language English
English
topic QL614-639.8 Fishes
spellingShingle QL614-639.8 Fishes
Arinah Masli
Effects of different light intensities on survival and growth of Asian seabass, Lates calcarifer larvae
description 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.
format Thesis
qualification_level Master's degree
author Arinah Masli
author_facet Arinah Masli
author_sort Arinah Masli
title Effects of different light intensities on survival and growth of Asian seabass, Lates calcarifer larvae
title_short Effects of different light intensities on survival and growth of Asian seabass, Lates calcarifer larvae
title_full Effects of different light intensities on survival and growth of Asian seabass, Lates calcarifer larvae
title_fullStr Effects of different light intensities on survival and growth of Asian seabass, Lates calcarifer larvae
title_full_unstemmed Effects of different light intensities on survival and growth of Asian seabass, Lates calcarifer larvae
title_sort effects of different light intensities on survival and growth of asian seabass, lates calcarifer larvae
granting_institution Universiti Malaysia Sabah
granting_department Institut Penyelidikan Marin Borneo
publishDate 2015
url https://eprints.ums.edu.my/id/eprint/38026/1/24%20PAGES.pdf
https://eprints.ums.edu.my/id/eprint/38026/2/FULLTEXT.pdf
_version_ 1794022701151551488

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