APPENDIX. 239 



lake trout, and ombre chevalier, is the easiest ; the 

 results are very certain. The loss of ova from 

 these kinds has varied from 30 to 34 and 41 per 

 cent, in the last three years, and that this loss is 

 only half of what it had been in previous years, 

 as the men are more careful and understand the 

 collection and manipulation better. 



The Danube salmon (heuch) is very difficult to 

 propagate ; it has to be brought a great distance, 

 and the loss of ova has been as much as 89, 93, 

 and 81 per cent., arising from circumstances that 

 are unknown. They are easily hatched, but the 

 young fry die in a month after coming to life, and 

 they have not yet discovered the reason why they 

 are so delicate, but they require a different mode 

 of treatment before they become acclimatised. M.., 

 Coumes sent me 1000 ova of these fish, April 4th, 

 1863. I regret to say they were badly packed, 

 and most of them had hatched out in the bottles, 

 and were therefore dead. The ombre chevalier is 

 more easily propagated than the heuch, and can 

 be reared in small basins of three feet in depth of 

 water, and they live and do well. 



The fera fish, when fully grown, is about twelve 

 inches in length ; each fish produces a very large 

 quantity of eggs (10,000 to 20,000) ; but, as it is 

 very small, the quantity is unknown. They are 

 caught in the night it is called the herring of the 

 lakes. The young fish on leaving the egg is so 

 small that it can scarcely be seen in the water, and 

 can penetrate the smallest openings ; and in this 

 way it escapes from the boxes and places where it 

 may have been hatched, so that the number of fish 

 cannot be correctly ascertained, but he states that 



