Since carps and tench — hardly according to nature — only accept food when it is offered 

 very conveniently, the food is poured in heaps in the pond. Four food places per hectar 

 ire arranged well distributed so that smaller fishes are not crowded away from food and so 

 that, on the other hand, the fishes are repeatedly directed to the natural nutrition. 



The food places must be easily supervised and on firm not muddy ground. They are to 

 De changed repeatedly so that no putrid spots occur. The food places are marked by insert- 

 ing poles which project above the v/ater surface, and in some cases they are provided with 

 Drush roofs to protect against the inroads of ducks. The use of horizontal wooden food 

 tables on the pond floor, whose rim is surrounded by a high standing lath, is both expensive 

 ind superfluous. It has even been frequently observed that the hard wooden base is un- 

 pleasant and injurious to the soft fish mouth. 



The food is carried to the food places by means of a flat food boat, which is filled 

 from food stalls erected at large ponds or from the soaking box (Fig. 0-) . 



A change of food should never be sudden, or the fish will easily refuse the new food. 

 Dhis disadvantage may be avoided by a gradual chaiige. 



Fig. ^1, Food boat for the distribution of food at the food places 

 in the carp pond. The boat is built light and flat, and it contains 

 a middle section for lupines. In the foreground is a box for the 

 soaking of lupines. (From the picture archive of the Prussian 

 Agricultural Institution for Fishery in Berlin-Friedrichshagen), 



2. Trout Feeding . 



Trout take up food before it sinks to the bottom of the pond. Since trout exist 

 upon feeding practically altogether, it is far more easy to calculate their necessary 

 rations. On the other hand, their feeding requires greater care than is the case with 

 carp and tench. It must be done more often and more regiilarly. 



The amovint of food may be determined most simply by feeding each time so long as 

 the trout take up the food well. From the calculation of food requirement, it may be 

 assumed in feeding fingerlings at a water temperature of 10 to 15 "C, that the daily food 

 requirement per pond is about 5 percent of the total weight of fish present in the pond. 

 The "daily food weight" (the food percent) amounts to about 5 percent of the weight of 

 the fish to be fed. The weight of fish in a pond can be estimated by a san^le catch, 

 determination of the average piece weight and multiplication by the number of stock. 



U7 



