FOB PLEASUEE AND PROFIT. 



37 



at the top of the dani ait c, and the top sluice board in the 

 controlling sluice D is so adjusted that, under normal condi- 

 tions, about three inches of waiter are flowing into the hori- 

 zontal box screen at c and ofver the sluice at M. It is pretty 

 plain that each of the three outlets assists the other two, and 

 that in combination they quite control the water passing 

 through the ponds. Any surface water that may enter the 

 ponds is really beneficial, as it goes to form a useful spate 

 without any fear of flooding. I think that, with the help of 

 the photographs, all other matters atre made quite clear. I 

 may add that where room is of consequence the redds, G G G, 



Fig. 9. Plan of a Lake in the Hills. 



may be made in serpentine form, and thus a< larger area, of 

 spawning ground is obtained in the same distance. 



If you wish to make a set cf fish-ponds in which trout>rear- 

 ing may be carried forward under the most advantageous cir- 

 cumstances, then you must choose a favourable position, similar 

 to that which forms the subject cf the four next illustrations, 

 and the set of rearing ponds must be made off the main 

 stream. The accompanying plan (Fig. 10) shows you how to 

 go about the work, and I may say at once that a fishery so 

 planned is the most simple and perfect that present 

 knowledge of pisciculture permits ; indeed, I fail to see how it 

 can possibly be improved upon. Also, the scheme can be 

 curtailed or extended; the planning of the fishery still re- 

 mains perfect ; only, if more ponds are required, other distri- 

 buting ponds should be made. A greater number of rearing 

 ponds to each distributing pond than is shown in the plan is 

 next advisable. 



