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Supplementing diet for farmed abalones to manipulate greenlip abalone lip and shell color

May 2, 2024
in General
Supplementing diet for farmed abalones to manipulate greenlip abalone lip and shell color
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Better meals for farmed abalones

Credit: Pixabay

A mixed diet including native algae gives Australia’s prized cultured abalone the colors and appearance preferred by lucrative Asian markets, new research shows.

The study is part of South Australian Research and Development Institute (SARDI) and Flinders University research efforts to improve production systems for cultivating more farmed abalone in order to relieve pressure on limited stocks in the wild.

To buoy the $28 million-a-year export market, aquaculture researchers are working with the State Government, suppliers and the local industry, including producers on Kangaroo Island and South Australia’s pristine Eyre Peninsula region near the seafood ‘capital’ Port Lincoln.

Flinders University abalone researcher, Associate Professor James Harris, says more than 75% of abalone production comes from wild capture fisheries, of which about 40% of this production is defined as sustainable by the Status of Australian Fish Stocks.

“Increasing demand in Asia, led by Vietnam, Hong Kong and China for this leading Australian seafood export, means there is great potential for an increase in abalone aquaculture in our clean marine environments.”

Australia’s farmed abalone are fed formulated, pelleted diets which tend to produce greenlip abalone with a slightly different appearance to wild caught abalone.

The benefits to the color of shell, feet and lip color of adding dried macroalgae to the diets of farmed greenlip abalone (Haliotis Laevigata) was evaluated in their latest study published in the New Zealand Journal of Marine and Freshwater Research.

The phase feeding trial was conducted at the Department of Primary Industries and Regions SA (PIRSA) SARDI Aquatic Sciences Center to evaluate color change in three-year-old greenlip abalone lip, foot and shell.

Researchers added 15% of commercially available macroalgae meal or harvested Gracilaria cliftonii to formulated diets to better manage greenlip abalone lip color.

The experiment recommended a minimum of three months of the additional supplement and for the abalone to be harvested within one month to maintain the desirable pale lip color changes.

More information:
Mark Purvis et al, Colour change of greenlip abalone, Haliotis Laevigata Donovan, fed dried macroalgae meals in concurrent laboratory and on-farm trials, New Zealand Journal of Marine and Freshwater Research (2024). DOI: 10.1080/00288330.2023.2293734

Citation:
Supplementing diet for farmed abalones to manipulate greenlip abalone lip and shell color (2024, May 2)
retrieved 2 May 2024
from https://phys.org/news/2024-05-supplementing-diet-farmed-abalones-greenlip.html

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
part may be reproduced without the written permission. The content is provided for information purposes only.

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Copyright for syndicated content belongs to the linked Source : Phys.org – https://phys.org/news/2024-05-supplementing-diet-farmed-abalones-greenlip.html

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