368 BULLETIN OF THE BUREAU OF FISHERIES 
40. Stizostedion vitreum (Mitchell). Yellow pike, pike-perch, wall-eyed pike. 
RECORD OF CAPTURE 
Larval Stizostedion, probably of this species, were taken in towings in the western 
part of the lake from the middle of May until the middle of June. It is a very 
common fish of Lake Erie and the Niagara River and the young may be seined in 
abundance alongshore in sheltered places. 
DESCRIPTION 
The larval yellow pike resembles the yellow perch but has a myomere count of 
15 plus 26 instead of 18 plus 18. Postlarvse and young stages may be distinguished 
from the yellow perch by their slenderer, more rounded bodies, and the possession of 
canine teeth, and from the young of the more closely related sauger by a soft dorsal 
count of 19 to 22 rather than 17 to 19. 
Newly hatched larva (Thurlow hatchery specimen identified and loaned by John 
Hart). — Total length, 7.75; length to vent, 3.7; greatest depth, 1.5; diameter of eye, 
0.5 millimeter. Myomeres, 15 to vent plus 26 behind (incomplete). Inferior mouth 
and vent open; yolk very large, bright yellow in color and covered completely by large, 
light-colored, very stellate chromatophores, which extend over the heart and the large 
clear yellow oil globule. Eye large, blue-black in color. Embryonic marginal fin 
fold complete; small pectorals developed. 
Pigmentation. — There are about two large chromatophores on dorsal aspect of 
tail, and a well-defined line of dark brown spreading chromatophores, almost inter- 
locking, from vent to caudal. 
Older specimens in the same collection have the yolk absorbed. In these the 
large stellate yolk chromatophores persist on the yellow stomach region, and the last 
quarter of dorsal aspect has about 6 others arranged alternately on the two sides. 
12. 5 -millimeter stage . — Total length, 12.5; standard length, 11.75; length to vent, 
6.5; length of head, 3.35; snout, 0.9; diameter of eye, 0.8; greatest depth before vent, 
