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Please use this identifier to cite or link to this item: http://hdl.handle.net/1834/33

Title: Ulva reticulata and Gracilaria crassa: Macroalgae That Can Biofilter Effluent from Tidal Fishponds in Tanzania
Authors: Msuya, F.E.
Neori, A.
Issue Date: 2002
Publisher: Western Indian Ocean Marine Science Association (WIOMSA)
Citation: Western Indian Ocean J. Marine Science, 1 (2), p. 117-126
Abstract: Macroalgae (seaweed) can be cultured effectively for the production of useful algal biomass and removal of nutrients from fishpond effluents. A land-based, tide/gravity-driven flow-through, fish-macroalgae integrated system was studied at Makoba Bay, Zanzibar, Tanzania, during May-October, 2000. Rectangular cages made of 1-inch mesh netting were constructed in channels that received the outflows of the fishponds. Four species of macroalgae were planted in the cages and compared for their usefulness as biofilters. Gracilaria crassa and Ulva reticulata grew at average rates of 1.5 and 1.2 %, respectively. Both species removed nitrogen as seaweed protein at rates of up to 0.4 g N/m2/d. The algal biomass produced was of good quality with protein dry weight contents of 13% for Gracilaria crassa and 26 % for Ulva reticulata. The biofilters also raised the pH values of the fishpond effluents and oxygenated the water. In contrast to Ulva and Gracilaria, species of Eucheuma and Chaetomorpha performed poorly in the fishpond effluents.
Description: Research Groups: Department of Plant Sciences, Faculty of Life Sciences, Tel Aviv University, Tel Aviv 69978, Israel The National Centre for Mariculture, Israel Oceanographic and Limnological Research, P.O. Box 1212, Eilat 88112, Israel
URI: http://hdl.handle.net/1834/33
ISSN: 0856-860x
Appears in Collections:Western Indian Ocean Journal of Marine Science - Archive

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