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Is dietary phosphatidylcholine essential for juvenile slipper lobster (Thenus australiensis)?

Citation

Landman, MJ and Codabaccus, BM and Carter, CG and Fitzgibbon, QP and Smith, GG, Is dietary phosphatidylcholine essential for juvenile slipper lobster (Thenus australiensis)?, Aquaculture, 542 Article 736889. ISSN 0044-8486 (2021) [Refereed Article]

Copyright Statement

© 2021 Elsevier B.V. All rights reserved

DOI: doi:10.1016/j.aquaculture.2021.736889

Abstract

Phospholipids, especially phosphatidylcholine (PC), are considered essential nutrients for larval and juvenile stages of many decapod crustacean species due to low rates of endogenous biosynthesis and potential nutritional benefits in assisting lipid digestion and transport. This study was conducted to test the hypothesis that dietary PC is essential and would subsequently have beneficial effects on lipid utilisation and digestibility of fish oil triacylglycerol (TAG) in the slipper lobster, Thenus australiensis. Juvenile slipper lobsters were supplied six formulated experimental feeds with actual PC contents of 0.05, 0.48, 0.65, 0.98, 1.15 and 1.43% (dry matter) for 12 weeks. Manipulating dietary PC content had no effects on survival, growth, chemical composition, whole body or tissue lipid distribution, or apparent digestibility (AD) of gross energy (GE), total lipid (TL) or PC. Juvenile slipper lobsters appeared to possess fully developed and efficient mechanisms for GE, TAG and PC digestion (>95% AD). In vivo lipid class mass balance calculations demonstrated net intake of TL and TAG was considerably greater than was accumulated in the whole-body during growth. Thus, a significant proportion of dietary TL and TAG was utilised for energy and other metabolic processes. In contrast, particularly for low PL dietary treatments (≤ 0.5%), net gain of PC was greater than net intake, indicating a reliance on biosynthesis of PC. Thus, it is concluded that there is no or a very low requirement for dietary PC and thus may not be essential for the examined size class of juvenile T. australiensis when supplied adequate dietary PC biosynthetic precursors and other potentially related dietary nutrients. Further targeted research is recommended to verify if these findings are applicable to larval and early juvenile stages, and to enhance overall understanding of lipid nutritional requirements for T. australiensis.

Item Details

Item Type:Refereed Article
Keywords:slipper lobster, phospholipid, phosphatidylcholine, digestibility
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Animal production
Research Field:Animal nutrition
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - aquaculture
Objective Field:Aquaculture rock lobster
UTAS Author:Landman, MJ (Dr Michael Landman)
UTAS Author:Codabaccus, BM (Dr Basseer Codabaccus)
UTAS Author:Carter, CG (Professor Chris Carter)
UTAS Author:Fitzgibbon, QP (Associate Professor Quinn Fitzgibbon)
UTAS Author:Smith, GG (Professor Gregory Smith)
ID Code:144390
Year Published:2021
Funding Support:Australian Research Council (IH190100014)
Deposited By:Fisheries and Aquaculture
Deposited On:2021-05-20
Last Modified:2021-10-14
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