Journal article
Ingestion and digestion of micro-algae concentrates by veliger larvae of the giant clam, Tridacna noae
Aquaculture, Vol.473, pp.443-448
2017
Abstract
Knowledge of ingestion and digestion of micro-algae by bivalve larvae is critical for provision of appropriate larval nutrition supporting maximal growth and survival. However, little is known about the ingestion and digestion of micro-algae by giant clam larvae. This study determined the rates of ingestion and digestion of commercially available micro-algae concentrates by Tridacna noae larvae of different ages using epifluorescence microscopy. The micro-algae used were Isochrysis sp. (Isochrysis 1800®), Pavlova sp. (Pavlova 1800®), Tetraselmis sp. (Tetraselmis 3600®) and Thalassiosira weissflogii (TW 1200®). None of the four micro-algal concentrates were ingested by T. noae larvae at 24 h post-fertilisation, but all were ingested at 48 h and 72 h post-fertilisation, at different frequencies. At 48 h postfertilisation, Isochrysis sp. and Pavlova sp. were ingested by 77% and 70% of veligers, respectively, while T. weissflogii and Tetraselmis sp. were ingested by 10% and 30% of veligers, respectively. Similar rates of ingestion were observed for each micro-alga by larvae at 72 h post-fertilisation. Larvae capable of ingesting micro-algae concentrates were significantly larger than those that were empty and the minimum antero-posterior shell length of T. noae larvae capable of ingesting Pavlova sp. and Isochrysis sp. was 141 µm and 132 µm, respectively. Digestion of micro-algae by 48 h-veligers was observed 2 h after the start of feeding in 26.1% and 14.3% of larvae that had ingested Isochrysis sp. and Pavlova sp., respectively, but digestion of Tetraselmis sp. and T. weissflogii was not observed until 4 h nd 8 h after the start of feeding, respectively. Complete digestion of Pavlova sp. and Isochrysis sp. took up to 12 hours in both 48 h and 72 h post-fertilisation. Our results provide a basis for developing a more nutritionally informed approach to hatchery culture of T. noae
Details
- Title
- Ingestion and digestion of micro-algae concentrates by veliger larvae of the giant clam, Tridacna noae
- Authors
- Paul C Southgate (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and EngineeringRichard D Braley (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and EngineeringThane A Militz (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
- Publication details
- Aquaculture, Vol.473, pp.443-448
- Publisher
- Elsevier BV
- Date published
- 2017
- DOI
- 10.1016/j.aquaculture.2017.02.032
- ISSN
- 0044-8486
- Copyright note
- Copyright © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
- Organisation Unit
- School of Science and Engineering - Legacy; Australian Centre for Pacific Islands Research; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
- Language
- English
- Record Identifier
- 99451096002621
- Output Type
- Journal article
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