Simple Hatchery for Trout 



water from, the stream. No more water than can 

 pass through the pipe which feeds the trench can 

 then find its way to the eggs. The ground plan 

 of a stream pond and trench, Fig. 1, will show how 

 very clearly. The inlet pipe A may be made of 

 three-inch drain pipe. The trench B can be lined 



(IF necessary) 



Fig. 1. Simple arrangement for trout 

 breeding (ground plan). 



with large drain pipes. Al- 

 low two square feet for each 

 1,000 eggs. For 15,000 eggs 

 the dimensions of trench 

 may be two feet in width by fifteen feet in 

 length, or, better still, one foot by thirty feet. 

 The outlet C should be about six 

 of^HatcherT ^"ches wide and open to the air. 

 The bottom of the trench should 

 be covered with three inches of clean stones, 

 about an inch in diameter, among which the fry 

 can hide themselves when first hatched. Put 

 no screen or obstruction in the channel C, 

 but allow the fry to pass down to the brook, 

 and from the brook to the pond, just when they 

 think fit. A large piece of perforated zinc should 

 be placed in the brook at the mouth of the 

 inlet A to prevent the entrance of fish, rats, or 

 rubbish; and if there is not sufficient fall in the 

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