MB. F. DAT ON THE LOCH-LEVEH TKOTTT. 
81 
sized fish, which, owing to sickness or some other cause, have the 
colours of the brook-trout, with orange-tipped adipose dorsal 
fins. 
The question here arises whether these colours are perceptible 
in these fishes when removed-to fresh localities. In the year 
1868, the late Mr. Mclvor, of the Government Gardens at Oota- 
camund in the Madras Presidency, succeeded in introducing some 
Loch-Leven trout and other European fish to that elevated 
region, where they are or were doing well (see Journal of the Lin- 
nean Society, Zoology, vol. xii. p. 562). In January 1876, Mr. 
Thomas, F.L.S., of the Madras Civil Service, sent me a specimen 
from the Hills which was 6i inches long, and on its body were red 
spots. In this instance it was clear that if a young Loch-Leven 
trout could assume red spots when removed to Asia, there was no 
reason why any similar movement in Europe might not occasion 
the same results. 
The assumption of the general colours of the trout in any 
given locality by introduced breeds is of very common occurrence, 
at least after the third year. How this is the period at which 
the young of the imported forms would be in a condition to be 
observed by the fisherman, whether angler or netter. 
This is generally asserted to be owing to the imported fish 
having interbred with the local race, and the hybrid (as it is 
wrongly termed) or mongrel form has the local colours. It is 
therefore interesting to ascertain whether, were eggs removed to a 
given spot quite distinct from the waters where the parents reside, 
the young which emerge from those eggs would retain the colours 
of their parents or assume those peculiar to the locality ; for 
if this latter occurs, it must be evident that such has been con- 
sequent upon local surroundings. 
Ten thousand yearlings from Howietoun were turned into 
Loch Goldenhove, about two miles away, and fed by the same 
stream which passes through the fish-farm ; this loch is nine acres 
in extent, and averages six feet in depth. In July 1886, 1 exa- 
mined some of these introduced fish, and found them of a pur- 
plish colour shot with gold, and covered with black ocellated spots, 
but no red ones. Dorsal fin spotted with black, but without any 
white edging, its outer surface greyish ; a little orange upon the 
adipose dorsal fin. The colours, in fact, of these fish were not what 
is seen in the Howietoun ponds, but nearly approaching those 
in the Loch where they had been placed. A few had some red 
