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By C.P. B. Meske, F. Vogt

Hardbound. Aquaculture has won a momentum in the course of the international in the course of fresh many years that's unprecedented in different branches of foodstuff construction. This booklet describes equipment at the moment used for the construction of these hot water desk fish that are of significant value. integrated are experiments and approaches as a way to aid to strive against the starting to be meals challenge via new construction equipment for animal protein. the purpose of the paintings provided this is to advertise the continual creation of hot water desk fish independently of weather or setting in the least invaluable house or even in areas with wrong climate or topography

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19—23, and its construction is detailed in the following description. CONSTRUCTION The water from the tanks drains through pipes (1) into the activated sludge (or mud) chamber A.

The dark pipes carry the water supply and drains. The light guttering collects the effluent for delivery into the clearing tanks which are situated under the passages. 33 34 FISH A Q U A C U L T U R E Fig. 6: Detailed view of part of the research installation shown in Figure 5. Water inlet pipe on left. Drainage and aeration pipe in centre. The feed hoppers can be seen above the aquaria. They are rotated by a timeclockoperated electric motor, and dispense feed in controlled amounts. THE DEVELOPMENT OF NEW TECHNIQUES FOR A Q U A C U L T U R E 35 The quality of the water is decisive for all types of fish farming.

After several promising initial studies by von Sengbusch and Szablewski three lVzyear-old carp with an average live weight of 140 g were placed in a 40 1 plastic tank on 25 November 1964. The tank had a constant water flow at a temperature of about 23°C. The fish were fed regularly with both live feed (tubifex and daphnia) and dry trout concentrate. The results were startling: after 6 months the fish weighed 915 g, 910 g and 815 g respectively (von Sengbusch et al, 1965). The experiment demolished the so-called space factor effect and represents one of the decisive developments in warm water fish farming.

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