Evaluation of duckweed (Lemna gibba) as feed for tilapia (Oreochromis niloticus × O. aureus) in a recirculating unit |
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| Authors: | IG Gaigher D Porath G Granoth |
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| Institution: | 1. Institute for Environmental Sciences, University of the Orange Free State, Bloemfontein 9300 Republic of South Africa;2. Desert Research Institute, Sede Boqer 84990 Israel |
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| Abstract: | Hybrid Oreochromis niloticus × O. aureus were cultured at high densities in an experimental recirculating unit over a period of 89 days with duckweed (Lemna gibba) or a combination of duckweed and commercial pellets as feed. When fed duckweed alone, intake rate was low, feed conversion ratio good (1:1) and relative growth rate poor (0.67% of body mass d?1). Sixty five percent of the duckweed consumed was assimilated and 26% converted to fish. When the fish were fed pellets in addition to duckweed the rate of duckweed consumption decreased and growth rate of the fish doubled with feed conversion ratios between 1.2 and 1.8. Seventy percent of the mixed diet was assimilated but only 21% converted. Fish grown on the mixed diet performed similarly to fish grown on pellets but had a better feed conversion ratio. |
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