Dietary inclusion of Acti-Meal improves growth and feed utilisation of greenlip abalone (Haliotis laevigata)
Bansemer, Matthew S
Harris, James Owen
Stone, David A J
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Acti-Meal is a co-product of the wine industry, consisting of a steam distilled, milled and dried grape marc meal rich in carbohydrates (55–65%). In this 90-day study, growth and feed utilisation of juvenile (1.82 g) greenlip abalone (Haliotis laevigata) fed diets containing graded dietary inclusion levels of Acti-Meal (0 basal, 5, 10, 15 and 20%) were examined. Four replicates were allocated per treatment with 15 abalone per tank and abalone were fed to excess daily. All experimental diets were formulated to contain 35% crude protein, 5% crude lipid and 17.5 MJ kg−1 gross energy. In addition, a commercial diet was also fed to abalone and compared with the 0% diet. Growth and feed utilisation of greenlip abalone fed the commercial diet and the 0% basal diet were similar. Greenlip abalone fed any Acti-Meal inclusion level (5, 10, 15 and 20%) exhibited significantly superior growth to abalone fed the 0% basal diet. Notably, in comparison to the basal diet, specific growth rate and biomass gain were improved by 5 to 6% and 10 to 12% respectively. The improvements were achieved despite greenlip abalone consuming significantly less feed (~9%) when fed the Acti-Meal diets. Greenlip abalone fed diets with Acti-Meal also exhibited superior apparent feed conversion ratios compared to those fed the 0% basal diet, on average FCRs were reduced by 13%. We recommend dietary inclusions of up to 20% Acti-Meal to improve greenlip abalone growth. We also recommend an on-farm growth trial to validate this product.
This author accepted manuscript is made available following 24 month embargo from date of publication (August 2018) in accordance with the publisher’s archiving policy This manuscript version is made available under the CC-BY-NC-ND 4.0 license: http://creativecommons.org/licenses/by-nc-nd/4.0/ which permits use, distribution and reproduction in any medium, provided the original work is properly cited.