Aeration rate adjustment at night to prevent sinking syndrome-related death in the tiger grouper Epinephelus fuscoguttatus (Perciformes:Serranidae) larvae
The effects of different aeration rates at night to prevent sinking syndrome-related death (SSRD) of the tiger grouper, Epinephelus fuscoguttatus were examined. The aeration rates were fixed at 300 mL min−1 at daytime (07:00–19:00 hours) and regulated to 0, 300 and 900 mL min−1 at night (19:00–07:00...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | en en |
| Published: |
Wiley-Blackwell Publishing Ltd
2016
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| Subjects: | |
| Online Access: | https://eprints.ums.edu.my/id/eprint/28938/3/Aeration%20rate%20adjustment%20at%20night%20to%20prevent%20sinking%20syndrome-related%20death%20in%20the%20tiger%20grouper%20Epinephelus%20fuscoguttatus%20%28Perciformes_Serranidae%29%20larvae_ABSTRACT.pdf https://eprints.ums.edu.my/id/eprint/28938/1/Aeration%20rate%20adjustment%20at%20night%20to%20prevent%20sinkingsyndrome-related%20death%20in%20the%20tiger%20grouperEpinephelus%20fuscoguttatus%28PerciformesSerranidae%29larvae.pdf https://eprints.ums.edu.my/id/eprint/28938/ http://onlinelibrary.wiley.com/doi/10.1111/are.12479/abstract https://doi.org/10.1111/are.12479 |
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| Summary: | The effects of different aeration rates at night to prevent sinking syndrome-related death (SSRD) of the tiger grouper, Epinephelus fuscoguttatus were examined. The aeration rates were fixed at 300 mL min−1 at daytime (07:00–19:00 hours) and regulated to 0, 300 and 900 mL min−1 at night (19:00–07:00 hours). Larval survival, growth, feeding intake, sinking velocity, distribution and behaviour, stress level, surface tension-related death (STRD) and flow velocity distribution were assessed. The occurrence of SSRD in the tiger grouper was observed through the accelerated sinking velocity (Vl) (from 0.15 ± 0.09 cm s−1 at 4 days AH to 0.41 ± 0.09 cm s−1 at 12 days AH) coupled with larval passive swimming behaviour at night-time. On the final day of experiment (15 days AH), larvae reared in 900 mL min−1 at night had attained significantly higher (P < 0.05) survival (34.4 ± 5.5%), growth (5.8 ± 0.5 mm) and feeding intake (60.46 ± 6.98 ind. larva−1). A favourable flow field for the tiger grouper was produced in 900 mL min−1 at night-time, in which larvae were transported 15–25 cm above the tank bottom and 1.0 cm beneath the water surface. Under these night-time rearing conditions, larval stress level and number of STRD reared in 900 mL min−1 compared with those observed in 300 mL min−1 remained insignificant, indicating that strong turbulence of flow velocity was not detrimental for larvae. Our findings recommend aeration at 900 mL min−1 at night as this could improve larval survival by reducing SSRD. |
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