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Published VersionCC BY-NC-ND V4.0, Open Access
Journal article
Assessing potential to improve sandfish (Holothuria scabra) culture in Vietnam using supplemental seaweed feeding
Aquaculture Reports, Vol.35, pp.1-11
2024
Abstract
This study assessed potential improvement of sandfish (Holothuria scabra) culture using supplemental feeding with seaweed to explore its potential to support short-cropping. Three phased experiments evaluated juvenile growth and survival performance by: offering two types of seaweed-based supplemental feeds (Sargassum sp. and Gracilaria verrucosa) both processed by fermentation and pulverisation (Experiment 1); evaluating three stocking densities (25, 35 and 45 individuals per m2) using the best-performing diet from Experiment 1 (Experiment 2); and upscaling to commercial-level culture in three 400 m2 earthen ponds (Experiment 3). Fermented diets were prepared using a probiotic mixture (Saccharomyces boulardii, Lactobacillus acidophilus and Bacillus subtilis) added to ground, dried seaweed; while the pulverised diets were offered as a ground powder (350–450 µm particle sizes). Sandfish offered fermented Sargassum and Gracilaria reached 35.0% and 29.7% heavier mean final weights (18.18 ± 0.19 g and 16.81 ± 0.08 g, respectively), compared to their pulverised equivalents (11.82 ± 1.09 g across both seaweed species, p < 0.05) after 84 days of culture. Similar trends in growth rate (AGR and SGR) were evident. Fermented Sargassum sp. was therefore selected for subsequent experiments. During Experiment 2 the lowest density tested of 25 ind./m2 yielded the highest weight gain after 84 days, with juveniles 29.2% and 44.0% heavier respectively (final weight=18.20 ± 1.31 g), cf. 35 and 45 ind./m2, respectively (final weights=12.90 ± 0.71 and 10.20 ± 0.70 g, respectively). Growth at 25 ind./m2 was 15.7% faster (SGR=2.61 ± 0.09 g/day) compared to 35 ind./m2 (SGR=2.20 ± 0.07 g/day), and 26.5% faster relative to 45 ind./m2 (SGR=1.92±0.10 g/day). Sandfish grown in earthen ponds during Experiment 3 attained a final mean weight of 241.21 ± 0.84 g after 180 days. Final mean weights, weight gained and SGR (1.76 ± 0.06%/day) were not significantly different between ponds (p > 0.05). Valuable new information has been generated for further development of supplemental feeding of sandfish, and results here demonstrate high technical feasibility to support short cropping, with optimisation of this culture model required.
Details
- Title
- Assessing potential to improve sandfish (Holothuria scabra) culture in Vietnam using supplemental seaweed feeding
- Authors
- Nguyen Dinh Quang Duy (Author) - Research Institute for Aquaculture No 3Mai Nhu Thuy (Author) - Nha Trang UniversityMonal M. Lal (Corresponding Author) - University of the Sunshine Coast, Queensland, School of Science, Technology and EngineeringPaul C. Southgate (Author) - University of the Sunshine Coast, Queensland, School of Science, Technology and Engineering
- Publication details
- Aquaculture Reports, Vol.35, pp.1-11
- Publisher
- Elsevier BV
- Date published
- 2024
- DOI
- 10.1016/j.aqrep.2024.101945
- ISSN
- 2352-5134
- Copyright note
- © 2024 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/).
- Data Availability
- Data will be made available on request.
- Organisation Unit
- Australian Centre for Pacific Islands Research; School of Science, Technology and Engineering
- Language
- English
- Record Identifier
- 99995998702621
- Output Type
- Journal article
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