148 FISH FARMING I 



people realise. And, after all, it must not be forgotten that 

 fish-farming in the British Islesi should be, is, and will con- 

 tinue to be, principally conducted with a view to an increase 

 of sport rather than an increase of food supply, although I 

 do not dream of ignoring the importance of its bearing upon 

 the latter. Moreover, there is no doubt that trout fed on 

 horse-flesh, never develop such beautiful markings! and correct 

 contour of form as do those fed on meal. Then, again, there 

 is the difficulty of getting horse-flesh fresh and keeping it so ; 

 whereas fish-meal will keep! for many months. Beyond all, 

 it is a mistake to feed stock fish on horse-flesh, for diseased 

 ovaries will surely result in the case of the females. How- 

 ever, it may become necessary to give the matured spawners 

 %nd milters something in addition to the supply of natural 

 food and fish-meal, and if this is so, then fresh searfish run 

 through the chopper is to be preferred to any ether form of 

 food ; but care should be taken that no fatty fish, such as 

 herring, be given. Clams will be found most useful to give 

 the eggs a nice, rich pink colour, and at any time, and under 

 a,ny circumstances, they form most valuable food for mature 

 fish ; the one objection to them being the matter of expense. 



Before concluding my remarks on rearing fry, I would 

 draw attention to a contrivance of which I give an illustrar- 

 tion, and which Herr S. Jaffe, who first introduced it to notice, 

 describes as follows : 



" I raise my rainbows from 1 the yolk sac stage in floating 

 boxes, and I think that, with proper management, these 

 would be a material help in raising them in the open stream 

 anywhere up to, say, May, and turning them out largely and 

 cheaply. The boxes are the length of a sheet of perforated 

 zino (two yards) ; the bottom of 1 Jm. boards tightly nailed 

 up with rat-proof cover. The zino is perforated, No. 9, and 

 the box is anchored to a chain and pole in the stream. 

 In the illustration the perforated zinc is marked A ; B is the 

 framed lid, which proitects the fish from any outside enemies; 

 and c is a strong ledge that, in addition, to strength- 

 ening the contrivance, forms a platform on which 



