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

Hardbound. Aquaculture has won a momentum in the course of the global in the course of contemporary many years that is remarkable in different branches of meals creation. This e-book describes tools at present used for the construction of these hot water desk fish that are of significant value. integrated are experiments and tactics in an effort to support to wrestle the becoming foodstuff challenge via new construction tools for animal protein. the purpose of the paintings awarded here's to advertise the continual construction of hot water desk fish independently of weather or setting in the least invaluable area or even in areas with flawed climate or topography

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It was possible to formulate and test feeds containing only a few basic ingredients which performed as well as feeds containing fish meal. The addition of unicellular green algae produced some interesting results and these are discussed below. FEED QUANTITY The application of knowledge on feedstuffs and their optimal formulation is of no avail if feeding methods are not used to the best advantage or when actual feed requirements are not known. Confusion also frequently arises because workers in different disciplines tend to use the same terms to mean quite different things.

For feeding warm water table fish in tanks a demand feeder developed at the Ahrensburg Institute gave the best results. The feeder is operated by the fish tugging at a flexible lure. This feeder is illustrated and described in Fig. 63 while the results of selffeeding experiments are shown in Figs. 64—66. In the event of oxygen deficiency occurring the fish tend to stop using the feeder, thus preventing any further degradation of their environment. Certain feeders dispense a predetermined amount of feed at set times.

The process is called hypophysation and consists of intramuscular injection of a suspension or extract of pituitary gland material. This raises the level of sex hormones and brings about the maturation and shedding of the sex products in both male and female fish. Woynarovich used the method he had developed on the carp in the Ahrensburg aquaria in August 1966. The carp were 2 years old when the treatment commenced, and had been fed almost exclusively on dry concentrates (Woynarovich and Kausch, 1967).

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