92 Tliirli/si.rll, AiniNul Mccliinj 



how tnml and American l)r()()k Irout also, if niouoli wild fish 

 fould 1)L' liad. to inccl the dcinaiid I'oi- Oi;;i;-s and frv. as well as 

 yc'arlin<is of these soils. Since this is, inii'ortunately, not tlie 

 case, all who hreed these sorts will he driven to I'oed hrood-fish. 



Forcing. 



Under this heading may he here understood, not only the 

 feeding by which tlie fish arc driven rapidly, and beyond th.i 

 usual limits of growth, but also the feeding of fish intended 

 for market. Since this latter has to do with the production of 

 so-called niess-tish, ( portionsfisch ) that is, fish of an average 

 weight of 100 grams (314 ounces), the question arises, what 

 food is specially adapted for this purpose? 



Here naturally again stand in the front rank the fresh and 

 salt-w-ater fish, which have been already recognized as the best 

 food for brood-fish and for the earlier stages. This food should 

 not be lacking in any forcing establishment when it can pos- 

 sibly be obtained. 



Unfortunately there are many estaljlishments wdiich cannot 

 obtain fresh-water fish at a satisfactory price, and the trans- 

 portation of salt-water fish also naturally ceases in the heat of 

 summer for all such establishments as are remote from the sea ; 

 thus nothing is left for fish-forcing but recourse to two foods. 

 — that is, first, slaughter-house waste, and second, the dry foods, 

 that is, fisli-meal, meat-meal and blood-meal. 



Slaughter-house waste is a food which can be obtained 

 everywhere and always fresh. It comes everywhere at a price- 

 not higher than one or two cents a pound, delivered at the 

 station, and five or six pounds of it is required to produce a 

 ])oun(l of fish. Slaughter-house waste must be used only 

 scaldcd, and for this reason, that the digestibility of it is there- 

 by materially increased. Great emphasis is to be laid upon 

 this, because slaughter-house waste is of itself always hard 

 to digest, and makes the greatest demands on the digestive ap- 

 ])aratns of the lisli. Kxcrything must therefore be done, to do 

 away with this indigestiljilit \- as fai- as possible. 



A second ])i-cce|)t is that slaughter-house waste, after cook- 

 ing, must lie made as fine as ])ossil)le: the finer it is, the easier 

 it is to digest. 'I'hrowing it into tlie ])onds in large pieces is to 



