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Sustainable alternatives to dietary fish oil in tropical fish aquaculture

Citation

Alhazzaa, R and Nichols, PD and Carter, CG, Sustainable alternatives to dietary fish oil in tropical fish aquaculture, Reviews in Aquaculture pp. 1-24. ISSN 1753-5123 (2018) [Substantial Review]


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DOI: doi:10.1111/raq.12287

Abstract

Marine tropical carnivorous (MTC) fish are less tolerant to high dietary lipid compared with cold and temperate climate fish. However, insufficient n‐3 long‐chain (≥C20) polyunsaturated fatty acids (LC‐PUFA) compromises MTC fish health and growth which requires attention when choosing lipid sources in aquafeed formulations. Fish oil (FO) has been the major lipid source for feeding key MTC fish. We estimated that more than 200 thousand tonnes of FO were used to feed farmed MTC fish in 2016, representing nearly 25% of global FO production. Nevertheless, recent increases in FO prices and demand, and the foreseen inability of wild fisheries to produce sufficient FO in the future, have created a need for cheaper and more sustainable alternatives. Meta‐analysis showed that feeding vegetable oils (VO) to MTC fish can slightly reduce their growth, with a marked decrease in n‐3 LC‐PUFA content in the fish tissues corresponding with the increased replacement of FO and fishmeal in the diet. Rendered terrestrial animal fat or modulating the bioconversion of n‐3 LC‐PUFA precursors in VO can be utilised further in MTC fish nutrition with more research recommended on these approaches. Oils and oil‐rich meals from non‐food marine organisms are rich in n‐3 LC‐PUFA and represent an underutilised alternative to FO for tropical aquaculture. With oils rich in n‐3 LC‐PUFA produced from transgenic plants presently gaining regulatory approvals and becoming available as a renewable alternative to FO, aquaculture in the tropics and around the globe is ready to leap into a new phase of sustainable expansion.

Item Details

Item Type:Substantial Review
Keywords:aquaculture, tropical, nutrient requirement, fish oil, environment, LC-PUFA, meta-analysis, nutrition, sustainable aquaculture, tropical aquaculture
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Aquaculture
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Aquaculture
Objective Field:Aquaculture Fin Fish (excl. Tuna)
UTAS Author:Alhazzaa, R (Dr Ramez Alhazzaa)
UTAS Author:Nichols, PD (Dr Peter Nichols)
UTAS Author:Carter, CG (Professor Chris Carter)
ID Code:130962
Year Published:2018
Web of Science® Times Cited:4
Deposited By:Directorate
Deposited On:2019-02-21
Last Modified:2019-02-26
Downloads:0

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