TEOUT 



are bred in stagnant water in which there 

 should be a good stock of weeds. 



The fresh water shrimp (Gammarus pulex) is 

 an excellent form of food for young and old trout, 

 and should be given to the fry as soon as they are 

 old enough to manage them. Gorixce and other 

 small insects should also be given as often as 

 possible. The fresh- water shrimp is bred in run- 

 ning water, Corixce in still or slow running 

 water. Weeds are necessary to the well-being 

 of both. 



The boxes must be kept carefully covered, as 

 I have already pointed out. A kingfisher would 

 make short work of a box of fry, and other birds 

 and beasts of various kinds are partial to them. 

 There are only two courses open to the fish cul- 

 turist in dealing with these enemies to protect 

 his fish or kill the enemies. I prefer to protect 

 the fish first and kill the enemies afterwards. 



The greatest care must be taken not to intro- 

 duce, or allow to intrude, any water beetles or 

 the larger carnivorous aquatic larvae of insects, 

 into the rearing boxes. I have known cases 

 where the larvae of the Dytiscus marginalis, the 

 largest of our carnivorous water beetles, have 

 destroyed almost all the fry in a rearing pond. 



49 E 



