body fairly deep, lengthwise striped; Family Moronidae (part) River 



Bass 305. 



With not more than two spines in the anal fin 306. 



305. With seven or eight stripes on each side; Atlantic slope; introduced into 



California 



Roccus saxatilis (Walbaum) Striped Bass 

 With five or six stripes on each side; Mississippi Valley 

 Lepihema chrysops (Raf.) White Bass 

 (Roccus chrysops (Raf.) ) 



306. Preopercle finely serrate behind and below; belly evenly scaled; adults 



ten inches or more; Family Percidae Perch 307. 



Preopercle not serrate, or else with the belly unevenly scaled; small, seb 

 dom reaching eight, more often about three inches; Family Etheostomi' 

 dae Darters (About a hundred species, only the most common of 

 which are given here) 310. 



307. Body fairly deep; no canine (longer conical) teeth; sides with dark bars; 



eastern and north-central states 



Perca flavescens (Mitchill) Yellow Perch 

 Body elongate and almost cylindrical; canine teeth present; sides mottled 



308. 



308. With rows of dark spots on both dorsal fins; usually with a dark blotch 



at the base of the pectoral fin; cheeks closely scaled; posterior dorsal 

 fin with 17 to 20 rays; northern states 



Cynoperca canadensis (Smith) Sauger, Sand Pike 

 Stizostedion canadense (Smith) 

 Anterior dorsal fin with a large black spot on the posterior part; no dark 

 blotch at the base of the pectoral fin; cheeks sparsely scaled; posterior 

 dorsal fin with 19 to 22 rays 309. 



309. Body yellow mottled; lower fins yellow; eyes almost as far apart as the 



diameter of one eye; Great Lakes region, south and east 



Stizostedion vitreum (Mitchill) Walbeyed Pike, Pikcperch 



Stizostedion vitreum vitreum (Mitchill) 

 Body grayish; lower fins bluish; eyes much closer together; Great Lakes 

 region 



Stizostedion glaucum Hubbs Blue Pike 



Stizostedion vitreum glaucum Hubbs 



310. Belly partly scaleless or with scales on the mid-ventral line larger than 



those on the rest of the body, plate-like, or sometimes shed, leaving a 



bare area 311. 



Belly scales not noticeably different from the rest 327. 



311. Premaxillaries protractile, usually with a groove between them and fore- 



head; dorsal spines 7 to 11 312. 



Premaxillaries not protractile; no groove between them and forehead; 



dorsal spines 10 to 15 317, 



312. Body elongate; depth one-eighth to one-tenth the length; dorsal spines 



7 to 10 313, 



Body deeper; dorsal spines 9 to 11 315, 



294 



