240 How to obtain it. 



in nursery ponds this is not so, therefore the want must be 

 supplied artificially. Every one who knows anything about trout 

 knows how they delight in a rise of the water, and how much 

 more easily they are caught at such a time. An examination of 

 the contents of a few of their stomachs will show, in addition to 

 the ordinary food, consisting of worms, flies, etc., a proportion of 

 gravel and earthy matter. It is sometimes very desirable to make \ 

 .artificial spates in fish ponds, which is easily done by damming 

 back the water and letting it off through the ponds. Care 

 should be taken that the flow through the ponds is not materially 

 lessened in performing this operation. 



Earth has a beneficial effect in many ways, and in some cases 

 has been found to be a cure for fungus. Fry are very liable to be 

 attacked by fungus, and too much care cannot be exercised in 

 endeavouring to keep clear of it. Avoid any uncharred wood- 

 work about the ponds. Be careful that no roots of trees that 

 may have found their way into the raceway are cut in the spring. 

 I once saw a raceway that had been cleaned and had its sides 

 trimmed in early spring, and in doing this the roots of several 

 trees had been cut away. In a short time the end of every stump 

 was covered with fungus. It is also largely produced on the 

 pond bottoms when they become foul. Therefore, keep them 

 -clean, for if they be allowed to remain dirty mischief is sure to 

 .accrue to the fish. One of the most fertile sources of danger is 

 to be found in the accumulation of greasy or fatty matter on the 

 surface of the water, the result of artificial feeding. It should be 

 got away as often as it accumulates. Every time the fish are 

 artificially fed, more or less of this grease must be let free, and, 

 if not attended to it will float on the surface of the water. The 

 little nsh, when swimming near the surface, will come in contact 

 with it, and it will adhere to their fins and bodies, and will 

 become a suitable nidus for the germs of the fungus. It can 

 easily be kept from accumulating by breaking up the scum which 

 it forms, and floating it on to the outlet screen, or by skimming it 

 off the surface of the water. 



Should fungus from any cause attack the fish salt is a remedy, 

 .and it may be applied either by putting it through the ponds, or 

 .by netting out the affected fish and giving them a salt bath. In 



