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Protein sources influence both apparent digestibility and gastrointestinal evacuation rate in juvenile slipper lobster (Thenus australiensis)


Wirtz, A and Carter, CG and Codabaccus, MB and Fitzgibbon, QP and Townsend, AT and Smith, GG, Protein sources influence both apparent digestibility and gastrointestinal evacuation rate in juvenile slipper lobster (Thenus australiensis), Comparative Biochemistry and Physiology. Part A, 265 Article 111121. ISSN 1095-6433 (2022) [Refereed Article]

Copyright Statement

2021 Published by Elsevier Inc.

DOI: doi:10.1016/j.cbpa.2021.111121


Apparent digestibility and gastrointestinal evacuation rate were measured to assess the potential of five commercially available protein sources for their inclusion in feeds for juvenile slipper lobster, Thenus australiensis. Protein sources tested were fishmeal, krill meal, lupin meal, soybean meal and squid by-product meal. Apparent digestibility of crude protein ranged from 79.6% to 95.3%, with fishmeal protein significantly less digestible than lupin meal, squid by-product meal and soybean meal. Gastrointestinal evacuation rate was estimated from marker replacement, where yttrium oxide replaced ytterbium oxide. Faeces were collected every 3h for 48h, and a kinetic model was used to calculate the rate and time for the second marker to replace the first marker. Gastrointestinal evacuation (≥ 95%) was completed between 4 and 6h with no significant differences among protein sources. Faeces consisted of both markers in equal parts 2.7 to 5.0h after the feed switch, with lupin meal reaching the midpoint significantly faster than squid by-product meal and reference feed. The present study is the first in crustaceans to examine the relationship between apparent digestibility and gastrointestinal evacuation, showing more digestible protein sources had slower evacuation rates. The combined approach provides deeper insight into crustaceans' digestive physiology and helps understand their ability to digest specific ingredients. Further research is recommended to understand protein requirements in a broader context to verify highly digestible protein sources meet all nutritional requirements.

Item Details

Item Type:Refereed Article
Keywords:lobster aquaculture, protein sources, apparent digestibility, gastrointestinal
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Aquaculture
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - aquaculture
Objective Field:Aquaculture rock lobster
UTAS Author:Wirtz, A (Ms Andrea Wirtz)
UTAS Author:Carter, CG (Professor Chris Carter)
UTAS Author:Codabaccus, MB (Dr Basseer Codabaccus)
UTAS Author:Fitzgibbon, QP (Associate Professor Quinn Fitzgibbon)
UTAS Author:Townsend, AT (Associate Professor Ashley Townsend)
UTAS Author:Smith, GG (Professor Gregory Smith)
ID Code:148258
Year Published:2022
Funding Support:Australian Research Council (IH190100014)
Web of Science® Times Cited:4
Deposited By:Fisheries and Aquaculture
Deposited On:2021-12-15
Last Modified:2022-10-13

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