FISH-CULTURE. 229 



7 '5 inches, and weighed 2 '9 oz. This is good average growth 

 in Scotland for trout seven and nineteen and a half months old 

 respectively. 



By October 20th the upper 100-feet pond at Cralgend had 

 been cleaned, deepened, and filled; and 1242 of the S. levenensis 

 springlings from the centre 20 -feet pond at Howietoun were 

 brought across to Craigend and placed in it. On the following 

 day 1540 more were brought across, and placed in the upper 100- 

 feet at Craigend, from the same 20 -feet. This was all there 

 were, and as at least 5000 were placed in it as fry early in spring, 

 the loss must have been nearly 50 per cent., only 2782 remaining 

 on the 21st of October. I added 2218 S. levenensis from the east 

 20 -feet (which contained many more fry than the centre 20 -feet), 

 thus bringing up the number in the upper 100-feet to 5000 

 trout. I then cleaned the centre 20-feet, and filled it without 

 re-charring ; and on the 22d of October I placed 629 S. levenensis 

 fry into it. These were all that remained of a lot of 1000 fry I 

 had placed in the 9 -feet pond in May, the loss in this case being 

 under 40 per cent. The next day I completed the lower 100-feet 

 pond at Craigend, and on 30th October I placed in it 2315 S. 

 fario fry from the west 20-feet at Howietoun. These were all 

 that remained of the 13,800 ova laid down in October and 

 November 1875, and they averaged nearly 3 inches in length. 



On the same day I counted the S. levenensis springlings in the 

 east 20-feet, and found there were 1279 left in that pond. These, 

 with the 2218 already removed, bring up the number in that pond 

 to 3497, and experience has shown that this is as large a 

 number as can be raised up to November in the 20-feet pond 

 without sacrificing size. I returned 954 to the east 20-feet, and 

 placed the remaining 325 in the centre 20-feet, making 954 in 

 each. The perforated zinc was removed, and a larger size (No. 11) 

 substituted. 



On the 31st October I took 92 S. levenensis springlings from 

 some I had in the rearing-boxes, and divided them between the 

 east and centre 20-feets, thus bringing up the number in each to 

 1000 exactly. The west 20-feet was fitted up as a filter for the 





