248 SEASON 1877-78. 



" A non-migratory species, inhabiting Loch Leven and other 

 lakes of southern Scotland and of the north of England." 



This was the best description of S. levenensis until the publica- 

 tion of Day's Fishes of Great Britain and Ireland (1882). 



The change of character is very marked. The black spots are 

 found in the first generation passing to red, and showing in the 

 intermediatory stage yellow and ocellated. It is interesting to 

 note that this stage was manifested when the fish had assumed 

 its bridal dress. Both before and after the spawning season the 

 males were as silvery, and their spots as black, as in Loch Leven 

 itself. The ocellation shows that the tendency to change was not 

 in the first generation sufficient to overcome their normal habit ; 

 the yellowish halo only invested those spots which in S. fario are 

 often, at this season, of the brightest scarlet. 



SEASON 1877-78. FISH-CULTURE. 



On the 4th July I ran the 60-feet pond dry, and found that 

 490 of my S. levenensis trout hatched 1875 had disappeared since 

 they were put in in July last year. Out of these 50 had been 

 given away, and over 100 had either jumped out, or been taken for 

 experiment ; the loss unaccounted for would thus be under 340 

 fish, or 11 '11 per cent. I transferred the remainder, i.e. 2570 

 trout, to the centre 130-feet pond. They averaged about 6 oz. 

 Each 130-feet holds 11,750 cubic feet of water, equal to 73,437 

 gallons of water. When in ordinary work, the supply fills each 

 pond in 1 hour 50 minutes, and the quantity running through is 

 the same in each pond. This gives a supply of 120,000 gallons an 

 hour to the three ponds, or of 40,000 gallons an hour to each. 

 This is equal to changing the entire quantity of water in each of 

 the 130-feet ponds thirteen times per diem. This is one of the 

 principal reasons why the fish thrive so remarkably well in them. 

 After the 60-feet had been cleaned and re-charred, on the 1st 

 October I re-stocked it with yearling S. fario (hatched 1876), and 

 I brought 1878 from the lower 100-feet pond at Craigend. There 

 were a few more in that pond, but as they were rather larger than 



