1903-4.] Mr Calderwood on Bull Trout of Tay and Tweed . 31 
-was a bull trout or salmon. It is the smallest fish of the series, 
being only 28 f" long and lOf lbs. in weight, but it is interesting to 
compare it with the distinct bull trout nearest it in size, viz., No. 
10, which is 31" long and 12J lbs. in weight — a Loch Ness fish. 
Head. 
No. 6 13-3 
10 15-0 
Tail fin. 
concave 
straight 
Scales. 
12 
11/10 
Fin formulae. 
D 13 P 12 V 9. 
D 13 P 11 V 9. 
Head in length 
of fish. 
5§ times 
5 times 
No. 6 had a few spots on the shoulder below the lateral line 
and numerous maggots in the gills. 
No. 10 had spots along the side to a level of the posterior 
margin of dorsal fin, but had no maggots. 
The total absence of maggots is, I believe, rare. 
That the bull trout of the Ness is quite similar to the Tay 
bull trout is well seen by comparing Nos. 9 and 11. 
Length. Depth. Weight. Head. Scales. Fins. 
No. 9 34|" 8" 19| 17 cm. 12 D14V9. 
11 34i" 7|" 17f 17 cm. 12 D14V9. 
The measurements of the head in each case show that, in the 
series, the length of the head is contained in the length of the 
fish from 5 times to 5^ times, all measurements being of females. 
In the same way, the vertical measurement of the caudal peduncle 
is contained in the length of the fish from 13 J to fully 15 times. 
The belief that these Tay bull trout are in reality salmon 
receives what I think may almost be considered practical confir- 
mation from certain recaptures of marked salmon which have 
recently been reported to me. Six Tay fish have been recaptured 
as bull trout which, when marked, were not noticed to show any 
trace of bull trout characteristics, but to be ordinary salmon. 
^ marked 14 lbs. : 36": kelt: 9 : 17th Jan. 1902: at Battleby. 
No. 8161 < recaptured 33 lbs. : 43" : clean : 27th July 1903 : “ Skin the Goat ” 
( station, near Newburgh. 
(This fish may have ascended, spawned, and descended in 
the interval. ) 
No 8311 \ 13 lbs. : 32" : kelt: 9 : 23rd Jan. 1902 : East Haugh, r. Tummel. 
\ 17 lbs. : 38" : clean : 15th Apr. 1903 : Flookie station, in tidal water. 
( 6 lbs. : 24" : kelt : 6 : 10th Feb. 1903 : East Haugh, r. Tummel. 
No. 8343 < 14f lbs. : 33J": clean : 20th Aug. 1903 : Pyeroad station, in tidal 
( water. 
