1882.] ON HYBRIDS BETWEEN SALMON AND TROUT. 751 
5. On Hybrids between Salmon and Trout. 
By F. Day, F.Z.S. 
[Received December 7, 1882.] 
The hybridism of fishes is a question of very great interest to the 
zoologist and importance to the pisciculturist, but which, for obvious 
reasons, is difficult to investigate, it being only those who possess 
large stock-ponds or peculiarly adapted waters that are able to assist 
inquirers in this direction or personally afford the desired infor- 
mation. 
Among the Salmonide hybrids have frequently been adverted to 
as occurring in a state of nature, as well as due to the manipulations 
of pisciculturists. Fitzinger informs us that Salmo schiffermuelleri 
must be considered a cross between a Trout and a Charr, and that 
in the young the reproductive organs merely exist in a rudimentary 
condition, while they degenerate into adipose tissue in the adult. 
At Sir J. Gibson-Maitland’s magnificent piscicultural establish- 
ment at Howietoun near Stirling some experiments on this subject 
have been made, at first under the impression that all our freshwater 
forms of Trout were distinct species; while others are now in progress, 
the results of which will be watched with great interest. 
November 25th, 1879, a man arrived at Howietoun with some 
salmon-milt obtained the previous night; and this was employed for the 
purpose of fertilizing some eggs from a four-year-old Lochleven Trout. 
A few of the progeny were successfully reared ; and one of the last 
examples was captured in the stock-ponds in my presence, November 
14th, 1882. It was given me by the owner, and is now on the table. 
The age of the fish is consequently about 2 years and 9 months, 
being in fact a grilse in good condition and 11 inches in length. 
B. x. D. 12 (8). PB. 12-13. V.9...A. 11 (%)..C. 19. 
L. 1.118. L. tr. 25/30. Cee. pyl. 62. 
inches 
Total length of specimen... ./- +.» 000 sis 11:0 
Tienet lt Of GAG gy) 235 2 cacy. tenigs seaalecatptey ah nyt 2°4 
Lernpth, of pectoral. fin . 0a... ..<\ay5 «foans s)2) “1 1°7 
Distance from snout to base of dorsal fin .. 4°5 
Distance to centre of base of caudal ... .. 9°8 
PRAMEIP RDP yes? i ciceake Ao" wise oe ae Spee 0°4 
Distance of eye from end of snout ........ 0°7 
WHR RANOG AMERE fe 5 oica 2 orn tia arsenn of (ON 0°8 
Height of body........ wlan ihr Pigs ¥ i's aan dae 
Preopercle forming an almost regular curve, with but very slight 
appearance of a lower limb. Lower jaw with a slight hook at 
its extremity. A line taken from the snout to the furthest point 
of the posterior edge of the opercle passes through the lower 
third of the eye. Teeth in a double row along the body of the 
vomer. Scales: 12 rows passing downwards and forwards from the 
hind edge of the adipose dorsal fin to the lateral line; 25 rows 
Proc. Zoou. Soc.—1882, No. L. 50 
