THE NEW ART OF BREEDING FISH. 157 



the vessel. The male fish is then to be held and 

 pressed in the same way, which will cause the emis- 

 sion of mature milt into the vessel. The fish are 

 to he returned to their native element, where, if the 

 manipulator be not a rough one, they will speedily 

 recover, and, when the remaining spawn, not arti- 

 ficially forced from them, becomes mature, they will 

 deposit it as if nothing had happened. Having ex- 

 pressed ova and milt into the vessel, it must be 

 shaken so that gravel, water, milt, and ova be pro- 

 perly mixed, and that no ova escape from coming 

 into contact with portions of milt. If any do, they 

 will not be impregnated. On the contrary, the ova 

 that are touched by the milt are impregnated, and, 

 if properly cared for, will, in due time, produce 

 young salmon. I solicit the attention of the owners 

 of rivers to the following great fact : — Salmon-spawn 

 artificially expressed from parent fish, and treated 

 in the manner just now directed, may be conveyed 

 without injury very long distances — from rivers in 



one country to rivers in another To return 



to our artificial pond, now ready for the reception of 

 the impregnated spawn. It must be imbedded at 

 the head of the pond— at the commencement of the 

 inclination of its bottom, in a small trench about 

 five inches in depth, formed longitudinally with the 

 current, and not across it. The spawn must not be 

 laid all of a heap in the trench, but carefully mixed 

 with gravel all over its bottom, and then covered in 

 with the gravel that has been excavated in forming 

 the breeding furrow. The trench and its covering 



