SALMON INVESTIGATIONS IN IDAHO IN 1895. 
185 
While these young salmon would rise to the ily, they would rarely take it in their mouths. After 
slowly and carefully iuspeotiug it they would usually slowly sink to deeper water. If the hook were 
halted they would often attempt to take it, hut our smallest hooks were too large for such small fish, 
and we succeeded in landing only one. 
The color of these young salmon may )je thus described: Side with about 10 rather distinct 
hluisl vertical bars, each about two-thirds diameter of eye, extending across the lateral line, the 
upper end of each broken up into spots, the lower ending more definitely about midway between 
lateral 1 iiie and median ventral line ; back and upper part of sides covered irregularly with small dark 
spots; belly and lower part of sides silvery, but thickly covered with hue dark punctulations, these 
also covering all other parts of the body; lower jaw pale, with many fine dark specks, rest of head 
appearing bluish-black from the very numerous fine specks. 
Young 
Chinook Sulmon (Oncorinjnchus tscliawytscha), Ara.'wn iioni ,iu example 4 inches 
long caught in Alturas Lake, Idaho, September 9, 1895. 
Eighty-three specimens, averaging about 2 inches in length, give the following average compar- 
ative measurements : Head 3 j- to 3|- ; depth 4 to 4|; eye 24 to 3; snout 4. 
Young Chinook salmon of this size so closely resemble young cut-throat trout that they can not be 
distinguished without close observation. -Tlie difference in the size of the anal fin (14 to 17 rays in the 
salmon, and only 10 to 12 in the trout) is the best differential character, but the following characters 
are also of value : In the salmon the first anal rays are produced, thus making the fin decidedly falcate, 
the maxillary is longer and more slender, the snout a little more pointed, the mouth less oblique, and 
the color not quite so dark as in the trout. 
From young redftsh of the same size the chinooks may be distinguished by the deeper body, 
darker coloration, falcate anal fin, and the much shorter and less numerous gillrakers. 
Lengths and comparatwe measurements of specimens of young chinooJc salmon. 
Locality and date. 
Length. 
Head . 
Depth. 
Snout. 
Eye. 
Alturas Lake, 
July 20 
2i 
4 
45 
4 
3 
25 
n 
n 
4 
3 
2| 
4 
if 
4 
3 
2J 
35 
4 
3 
2| 
3-5 
4 
3 
Meadow Creek, 
July 30 
15 
35 
4i 
4-f 
3 
25 
4 
45 
4 
3-t- 
15 
35 
45 
4 
3-t- 
If 
3| 
45 
4 
25 
2f 
. 35 
4 
4 
3 
26 
35 
4 
4 
35 
2f 
3|- 
3f 
4 
3i 
2 
35 
4 
4 
3 
2i 
3§ 
45 
4 
3 
2f 
3? 
4 
4 
3 
25 
3-J 
45 
4 
3 
Locality and date. 
Length. 
Head. 
Depth. 
Snout. 
Eye. 
Meadow Creek, 
July 30 
‘-'2 
4+ 
23- 
25 
H 
4 
4 
3 
2-5 
35 
4 
4 
3 
2i 
35 
41 
4 
3 
25 
35 
4 
4 
35 
2i 
35 
45 
4 
3 
2 
3| 
45 
4 
3 
2 
3| 
45 
4 
3 
2i 
35 
45 
4 
3 
25 
3J 
45 
4 
25 
2 
3i 
4 
4 + 
3 
2 
3f 
4| 
4-h 
2i 
25 
3i 
4f 
45 
25 
2 
35 
4 
5 
9A 
“2 
25 
35 
4-f 
4 
3 
2-1 
3|- 
45 
4 
3 
15 
4 
4 
-■5 
