STUDIES ON WATER CONTROL BY FILTRATION THROUGH SAND BED IN A MARINE AQUARIUM WITH CLOSED CIRCULATING SYSTEM-IV:RATE OF POLLUTION OF WATER BY FISH, AND THE POSSIBLE NUMBER AND WEIGHT OF FISH KEPT IN AN AQUARIUM
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概要
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In previous reports1)2)3), the relation between purification of breeding water of an aquarium with closed circulating system, structure of a filter and filtering velocity was studied by using the oxygen consumption during filtration (OCF) as an index in evaluating the degree of purification. If fish are kept well in an aquarium for a long time, a balance must be established between purification of breeding water by filtration and pollution by excretion of fish and by feeding. Therefore, the oxygen consumption during filtration corresponds to the rate of pollution of breeding water. The present studies were carried out to find out the change in the rate of pollution by fish cultured with or without feeding. Sea breams, Chrysophrys major were cultured in an experimental aquarium (Fig. 1), and OCF per unit time (mg/min) were measured under various culturing conditions. The rate of pollution expressed in OCF (Xmg/min) was found to have the following relation to the body weight of fish (B g) and to the amount of food per day (F g, day): X=q∑j=1(Bj0.544×10-2)+0.051F, where q is the number of fish. From results of previous3) and present studies, fish cultured in an aquarium must he kept well for a long time, if the following relation holds in that aquarium: p∑i=1 10Wi/0.70/Vi+0.95×103/GiDi≥q∑j-1(Bj0.544×10-2)+0.051F where W, V, D, G and p represent area of filter bed (m2), filtering velocity (cm/min), sand lepth (cm), grain-size coefficient3) and number of filter respectively. This relation was conirmed experimentally.
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