Ref ID : 1085
Yamasaki Shigehisa and Hirata Hachiro; Water quality maintenance and food saving by recycling the waste matter of a rotifer ecosystem culture. Suisan Zoushoku 41(1):7-11, 1993
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An ecosystem culture with a consumer-producer relationship based on the cycle of substances in the natural ecosystem was constructed, in order to observe the effect on water quality maintenance and saving input food matter. The rotifer, Brachionus plicatilis was used as a consumer. Phytoplankton (Nannochloropsis sp. for experiment 1 and Tetraselmis tetrathele for experiment 2), available to the rotifer, were used as producers. Waste in the rotifer culture medium and an extract from decomposed biodeposits were used to cultures the phytoplanktons. The amount of recycled phytoplankton contributed up to 30% of the total food supply, which consisted of input food and the recycled phytoplankton. Hence, specific food conversion efficiency, calculated from total supply of input food and the recycled phytoplankton. Water quality of the rotifer culture medium was better maintained in the ecosystem culture than in the routine culture.