130 FISHES OF PENNSYLVANIA. 

ough, Columbia dam and Conewago Falls. The species is well dis- 
tributed throughout the river and its larger tributaries, especially the 
Juniata and the North Branch. 
147. Stizostedion vitreum salmoneum (Rarrnesque). 
The Blue Pike. (igure 69.) 
The blue pike of Lake Erie, or white salmon of the Ohio river, was 
formerly distinguished by name from the common pike perch, but is 
now considered unworthy of a separate name. 
This is a very small variety seldom exceeding fifteen inches in length 
and a weight of two pounds. The dorsal has fourteen spines and twenty 
rays. The spines are rather lower than in the pike perch, the colora- 
tion similar, but the adult is bluish or greenish and has no brassy 
mottling. The fins are darker and there is a trace of a band along the 
dorsal, besides the black blotch on the hind portion. » 
148. Stizostedion canadense Smrruz. 
The Sauger. (Figure 70.) 
Body slender, not much compressed, roundish; its depth contained four and one- 
half to five times in the total without caudal. The head is pointed, about two-sev- 
enths of standard length and contains the eye five to five and one-half times. The 
mouth is smaller than in the pike perch; the maxilla reaches to the hind margin of 
the eye. 
D. XII to XIII, I, 17 to 18; A. II,12. Scales 92 to 98; 4 to7 pyloric czea, unequal 
in size and all of them shorter than the stomach. 
Color olivaceous above; sides brassy.or pale orange, mottled with black in the 
form of irregular dark blotches, which are best defined under the soft dorsal. The 
spinous dorsal has several rows of round black spots on the membrane between the 
spines; no black blotch on the hind part of the spinous dorsal. Pectorals with a 
large dark blotch at base. Soft dorsal with several rows of dark spots irregularly 
placed. Caudal yellowish with dark spots forming interrupted bars. 
The sauger is known also as sand pike, gray pike and green pike, 
pickering, pickerel and horse fish. It is found in the St. Lawrence 
river and Great Lake region, the upper Mississippi and Missouri rivers 
and in the Ohio where it is said to have been introduced from the lakes 
through canals. 
This is a small fish, seldom exceeding eighteen inches in length, and 
embraces several varieties only ene of which is found in Pennsylvania, 
the one called gray pike. It is a very common fish in the Great Lakes 
and is abundant in the Ohio river. It is doubtful whether it is native 
to Ohio or introduced. It is very extensively used for food but is not 
equal to the pike perch. 
