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Integrated seaweed cultivation on an abalone farm in South Africa
Stockholm University, Faculty of Science, Department of Systems Ecology.
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2008 (English)In: Journal of Applied Phycology, ISSN 0921-8971, E-ISSN 1573-5176, Vol. 20, no 5, 579-595 p.Article in journal (Refereed) Published
Abstract [en]

Land-based abalone aquaculture in South Africa, based on the local species Haliotis midae, started in the early 1990s and has grown rapidly in the last decade, with 13 commercial farms now producing over 850 t per annum. Over 6,000 t per annum of kelp Ecklonia maxima are now harvested for this purpose, and some kelp beds are reaching maximum sustainable limits. Research into seaweed aquacultureas feed (Ulva and some Gracilaria) for abalone started in the late 1990s on the southeast coast (where thereare no kelp beds) using abalone waste water. A growing body of evidence suggests that a mixed diet of kelp plus other seaweeds can give growth rates at least as good ascompound feed, and can improve abalone quality and reduce parasite loads. A pilot scale Ulva lactuca and abalone integrated recirculation unit using 25% recirculation was designed and built on the south west coast of South Africa using one 12,000-L abalone tank containing 13,200 15±2.5 g abalone, connected to two 3,000-L seaweed tanks containing an initial starting biomass of 10 kg of seaweed, replicated 3 times. In an 18-month period, there were no significant differences in abalone health or growth rates, sediment build up and composition, mobile macro fauna densities and species between the recirculation or the flowthroug hunits. Transfer of oxygen generated by the seaweeds to the abalone tanks was poor, resulting in the recirculated abalone tanks having lower (33%) dissolved oxygen concentrations than a comparable flow-through abalone unit. Seaweed nutrient content and specific growth rates in the units were comparable to seaweeds cultivated in fertilized effluent (SGR=3.2±3.4%.day−1; Yield=0.2±0.19 kg.m2.day−1). Indications were that at this low recirculation ratio the seaweeds in the units were nutrient limited and that there were no negative effects to the abalone being cultivated insuch a recirculation unit at this recirculation ratio.

Place, publisher, year, edition, pages
2008. Vol. 20, no 5, 579-595 p.
Keyword [en]
Integrated, Abalone, Seaweed, Aquaculture, Ulva, Recirculation
National Category
Ecology Fish and Aquacultural Science
Identifiers
URN: urn:nbn:se:su:diva-124295DOI: 10.1007/s10811-007-9239-7OAI: oai:DiVA.org:su-124295DiVA: diva2:883491
Available from: 2015-12-17 Created: 2015-12-17 Last updated: 2017-03-08Bibliographically approved

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Hansen, JoakimTroell, MaxHalling, Christina
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Department of Systems EcologyStockholm Resilience Centre
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