74 
and other circumstances, and cannot be definitely stated. 
Green says 5lbs. for a thousand two-year-olds. I should 
say this would be an average feed through the year. I 
think it safe to say that under favorable circumstances 
large trout of any age will eat 1-50 of their weight in sum- 
mer, that 1% of their weight will keep them in good condi- 
tion through the year, and that they would do very well 
on half that allowance.’’ Dr. Slack, in his book, ‘‘ Trout 
Culture,’’ stated that his brood stock throve very well on 
4 of 1% of their weight per day. 
In the report of the United States Commission of Fish 
and Fisheries for 1884 is a translation of Mr. Carl Nick- 
las’s book entitled ‘Pond Culture.” In this work Mr. 
Nicklas enters exhaustively into the character and quan- 
tity of food necessary for fish On page 112 he says: “As 
there are no data on the subject, it will be difficult to lay 
down exact rules as to the quantity of food. It will be 
correct to presume, at least approximately, the same princi- 
ples will have to serve as a basis as those prevailing in the 
feeding of cattle, and we shall, therefore, be enabled to fix 
a standard which will come as near the true one as possi- 
ble.’ Reasoning on this basis, Mr. Nicklas concludes that 
1,000 lbs. of carp will require 15 lbs. or 13% of their weight 
of food per day. When we consider that a carp will con- 
sume, and probably requires, more food than a trout, we 
see that these three writers are in fairly close accord ; and 
that the average practice of feeding 63% of their weight to 
trout is in excess of the amount required. However, it 
must not be forgotten that these growing yearlings would 
most likely need a higher per cent. than the matured fish ; 
but I cannot believe that the process of growing would re- 
quire six times the material found necessary for mainte- 
nance after growth was accomplished. 
So much as to the amount of food necessary, and that 
given in actual practice. Let us look now at what consti- 
tutes the food of trout under domestication. At sixteen 
