x CONTENTS. 



size of ponds. Transfer of fish from one pond to another. 

 Estimate of number of trout for a given supply of water. Jere- 

 miah Comfort's ponds. Stocking ponds. Procuring and trans- 

 porting brood trout . . . . P. 26 



CHAPTER III. TROUT BREEDING. 



Incubation and Treatment of Fry. 



Hatching apparatus. French and American plans. Supply of 

 water for a given number of eggs. Hatching-house. Illustration 

 with explanations. Filterer. Troughs. Nursery. Manage- 

 ment of filterer. Washing gravel for troughs. Implements. 

 Taking the spawn. Action of the female when about to spawn. 

 Method of catching the fish on the spawning-beds. Indications 

 of the maturity of the eggs. Manipulation. Placing the ova in 

 the troughs. Packing and transportation of eggs. Manner of 

 taking a large number of eggs for transportation from a trough. 

 How to examine them. Illustration Avith explanations of the 

 appearance of ova at different stages during incubation. Table 

 showing progress of incubation with water at different degrees 

 of temperature. Hatching out and progress in growth and ac- 

 tivity of fry. Treatment of fry. Their food, and manner of 

 feeding them. Their disposition to escape. Transferring them 

 to the nurseries. Their admission into the first pond. Trans- 

 portation of fry ..... 42 



CHAPTER IV. TROUT BREEDING. 



General Remarks, Food for Adults, Profits and Statistics. 

 Food of adult Trout. Curd, liver, maggots. Maggot factory. 

 Allowance of food for a given number. Natural food. Stall 

 feeding and its advantages. Trout culture a branch of farming. 

 Facilities possessed by farmers. Will fish culture pay ? In- 

 stances of its being profitable. Estimate of cost of feeding on 

 curd. Proposed trout breeding at Ingham Spring. Growth of 

 trout. Description of Huningue, and M. de Galbert's estab- 

 lishment, in France. Heidelberg. Fish cultural enterprise 

 in Switzerland. Trout culture in the United States. Notice 

 of Mr. Ainsworth's establishment. Description of Seth 

 Green's ... 73 



