Aeration rate adjustment at night to prevent sinking syndrome-related death in the tiger grouper Epinephelus fuscoguttatus (Perciformes:Serranidae) larvae

Ching , Fui Fui and Shigeharu Senoo , and Nakagawa, Yoshizumi and Kato, Keitaro and Sakamoto, Wataru and Takii, Kenji and Shigeru, Miyashita and Miura, Akira (2016) Aeration rate adjustment at night to prevent sinking syndrome-related death in the tiger grouper Epinephelus fuscoguttatus (Perciformes:Serranidae) larvae. Aquaculture Research, 47 (1). pp. 165-175. ISSN 1365-2109

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Official URL: http://dx.doi.org/10.1111/are.12479

Abstract

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−1at 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.

Item Type:Article
Uncontrolled Keywords:aeration rate adjustment, sinking syndrome-related death, survival, flow field, Epinephelus fuscoguttatus
Subjects:S Agriculture > SH Aquaculture. Fisheries. Angling
Q Science > QH Natural history > QH301 Biology
Divisions:SCHOOL > Borneo Marine Research Institute
ID Code:11859
Deposited By:IR Admin
Deposited On:24 Feb 2016 10:41
Last Modified:24 Feb 2016 10:41

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