The growth of post-weaning abalone (Haliotis midae Linnaeus) fed commercially available formulated feeds supplemented with fresh wild seaweed
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Date
2008
Journal Title
Journal ISSN
Volume Title
Publisher
National Inquiry Services Centre (NISC) and Taylor & Francis
Abstract
The effect of five formulated feeds, supplemented with fresh wild seaweed on the growth of post-weaning juvenile abalone (6 - 20
mm shell length), Haliotis midae Linnaeus was investigated by means of a growth trial at a commercial abalone farm over a period
of 11 months. The experiment included 10 diet treatments with two replicates each (n = 50 individuals per replicate). The first five
diet treatments comprised of four fishmeal-based formulated feeds: Abfeed®, Adam & Amos® ‘a’, Adam & Amos® ‘b’ and Adam &
Amos® ‘c’; and an all-seaweed-based formulated pellet: FeedX. The additional five diet treatments comprised the formulated feeds
above, supplemented with fresh, wild seaweeds; the kelp, Ecklonia maxima (5-15% protein) and Ulva lactuca (3.7-19.9% protein).
The fishmeal-based protein feeds produced significantly better growth than the all-seaweed-based protein feed, FeedX (0.49±0.03
SGR; 27.15±0.02 DISL; 0.864 final CF). Abfeed® (1.00±0.02 SGR; 60.79±0.04 DISL; 1.312 final CF) performed best of all the
formulated feeds. Supplementation with fresh wild seaweed, however, significantly improved growth of all abalone with
supplemented Abfeed® (1.05±0.02 SGR; 63.61±0.05 DISL; 1.447 final CF) outperforming all supplemented feeds. More striking
though was that the condition factor of abalone fed that feed (FeedX) that performed particularly poorly in the growth trials was
dramatically improved by supplementation. The results of this study show that supplementation with fresh wild seaweed enhances
the growth of abalone reared on formulated feeds.
Description
Keywords
Abfeed, Adam and Amos, Diet, Formulated feed, Growth, Haliotis midae, Seaweed, supplementation
Citation
Dlaza, T.S., Maneveldt, G.W. & Viljoen, C. (2008). The growth of post‐weaning abalone (Haliotis midae Linnaeus) fed commercially available formulated feeds supplemented with fresh wild seaweed. African Journal of Marine Science, 30(1): 199 ‐203