Amino acid compounds released by the giant freshwater prawn Macrobrachium rosenbergii during ecdysis: a factor attractin
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Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology) ISSN 1673-1581 (Print); ISSN 1862-1783 (Online) www.jzus.zju.edu.cn; www.springerlink.com E-mail: [email protected]
Amino acid compounds released by the giant freshwater prawn Macrobrachium rosenbergii during ecdysis: a factor attracting cannibalistic behaviour?* Abu Seman JUNETA-NOR1, Noordiyana Mat NOORDIN2, Mohamad Nor AZRA†‡1, Hong-yu MA3,4, Norainy Mohd HUSIN1, Mhd IKHWANUDDIN†‡1,4 1
Institute of Tropical Aquaculture and Fisheries, Universiti Malaysia Terengganu, Kuala Nerus, Terengganu 21030, Malaysia 2
Faculty of Fisheries and Food Sciences, Universiti Malaysia Terengganu, Kuala Nerus, Terengganu 21030, Malaysia 3
Guangdong Provincial Key Laboratory of Marine Biotechnology, Shantou University, Shantou 515063, China 4
STU-UMT Joint Shellfish Research Laboratory, Shantou University, Guangdong 515063, China †
E-mail: [email protected]; [email protected]
Received Mar. 17, 2020; Revision accepted July 22, 2020; Crosschecked Sept. 7, 2020
Abstract: Ecdysis is a common phenomenon that happens throughout the life phase of the giant freshwater prawn Macrobrachium rosenbergii. It is vital to better understand the correlation between cannibalism and biochemical compound that exists during the moulting process. The objective of the present study was to determine the amino acid profile released by M. rosenbergii during the ecdysis process that promotes cannibalism. To accomplish this, changes in amino acid levels (total amino acid (TAA) and free amino acid (FAA)) of tissue muscle, exoskeleton, and sample water of culture medium from the moulting (E-stage) and non-moulting (C-stage) prawns were analysed using highperformance liquid chromatography (HPLC). Comparison study revealed that among the TAA compounds, proline and sarcosine of tissues from moulting prawn were found at the highest levels. The level of FAA from water that contains moulting prawns (E-stage) was dominated by tryptophan and proline. Significant values obtained in the present study suggested that these amino acid compounds act as a chemical cue to promote cannibalism in M. rosenbergii during ecdysis. The knowledge of compositions and compounds that were released during the moulting process should be helpful for better understanding of the mechanism and chemical cues that play roles on triggering cannibalism, and also for future dietary manipulation to improve feeding efficiencies and feeding management, which indirectly impacts productivity and profitability. Key words: Amino acid compound; Cannibalism; Chemical cue; Giant freshwater prawn; Moulting https://doi.org/10.1631/jzus.B2000126 CLC number: S91
1 Introduction The giant freshwater prawn Macrobrachium rosenbergii is an important aquatic species in Malaysia, ‡
Corresponding authors Project supported by the Fundamental Research Grant Scheme from the Ministry of Higher Education, Malaysia (No. 59324) ORCID: Mohamad Nor AZRA, https://orcid.org/0000-0001-9333-9270; Mhd IKHWANUDDIN, https://orcid.org/0000-0002-6430-0
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