[9] ARTIFICIAL FEEDING OF CARP. 1017 



taiuecL* The mixture was prepared in tlie following manner. A paste 

 was formed by the bran and blood, which was rolled into large balls. 

 These balls were placed under the water near the banks of the pond, at 

 a depth of about 30 centimeters, in places exposed to the sun. In the 

 main pond the carp were therefore always fed in the same places, 

 and the carp soon showed a prefereiice tor being fed in these places. 

 Small aquatic animals also get their share of this food, and as they iu 

 their turn serve as food for the carp, nothing is lost ; which also is true 

 of most ariicles of fish food. 



A fifth mixture would be as follows: 1 kilogram of sprouting malt, 

 0.5 kilogram of wheat bran, 1 kilogram of meat flour, (i kilograms of 

 blood; containing U.040 of albumen and 1.048 kilograms of hydrate of 

 carbon, inclusive of fat. In this the proportion of nutritive substances 

 is 1 :0.51. 



The exi)ense would be about as follows: 1 kilogram of sprouting malt, 

 10 pfennigs [2i cents] ; 0.5 kilogram t)f wheat bran, 10 i)fennigs; I 

 kilogram of meat-flour, 30 pfennigs; kilograms of blood, 30 pfennigs; 

 total, 86 pfennigs [21i cents]. The kilogram of albumen would, there- 

 fore, be 43 i)fennigs; yielding a net profit of 80 pfennigs [1*0 cents] per 

 kilogram of increase. 



[f we were to base this calculation on the results above mentioned, 

 as given in my manual — I kilogram of albumen with the corresponding- 

 quantity of hydrate of carbon produces 1.428 kilograms carp flesh — the net 

 gain per kilogram of increase would be: In the second mixture 31.2 pfen- 

 nigs [about 8 cents] ; in the third, 50 pfennigs [12.^ cents] ; in the fourth, 

 60 pfennigs, and in the fifth, also, 60 [)fennigs. In considering the 

 profits calculated in the above, we must remember that the market 

 price of 100 pfennigs [25 cents] per kilogram of carp flesh is very low, 

 whilst the cost of the food has been set rather high. Blood may be ob- 

 tained from slaughter-houses for a few pfennigs a bucket, and often it 

 is freely given away. It follows further that even if the results of the 

 standard of food given by me were smaller than those mentioned above — 

 which I am firmly convinced, however, will never be the case— there 

 would still be considerable profit. 



I could increase the number of recipes for food very considerably, but 

 I think that those given will be sufficient to prove that mixtures ot food 

 can be produced with the proportion of nutritive substances given in my 

 standard. As this proportion is very close, some articles of food con- 

 taining a good deal of nitrogen should be added to all mixtures. As 

 the most profitable of such articles of food, and those most readily taKen 



* Unfortunately, neither the quantity of the mixture nor its proportion is given ; 

 nor is it stated what was the productiveness of the pond; we, theiefore, are not able 

 to ascertain how much of the 1.5 kilograms obtained must be ascribed to the produc- 

 tiveness of the pond. It may be supposed, however, that the quantity of food is less 

 than iu the mixture mentioned just above, which corresponds with my standard of 

 food. It must also be reraeoibexed tliat the fish were not fed every day. 



