| 1a) |
Upper lip attached to snout (Fig. A); snout long, overhanging the mouth
-> Longnose dace, Rhinichthys cataractae
|
| 1b) |
Upper lip separated from snout by a distinct groove (Fig B); snout short, scarcely overhangs the mouth
-> see 2 |
| |
Figure A
|
Figure B |
|
| 2a) |
Barbel present near corner of mouth (Fig. B) often difficult to see in small fish)
-> see 3
|
| 2b) |
Barbel absent
-> see 4 |
| |
|
| 3a) |
Dorsal originates in front of origin of pelvic fins (Fig. C); mouth small, in profile it does not extend back to the front of eye
-> Peamouth, Mylocheilus caurinus
|
| 3b) |
Dorsal originates behind origin of pelvic fins (Fig. D); mouth moderate, in profile it extends back to the front of eye
-> Lake chub, Couesius plumbeus
|
| |
Figure C
|
Figure D |
|
| 4a) |
Anal fin base long (12-19 rays but usually about 15 in our area); caudal peduncle narrow, about two times into anal fin base (Fig. E)
-> Redside shiner, Richardsonius balteatus |
| 4b) |
Anal fin base short (7-10 rays); caudal peduncle moderate, almost equal to anal fin base (Fig. F)
-> see 5 |
| |
Figure E
|
Figure F |
|
| 5a) |
Mouth large, in profile it extends beyond front margin of eye (Fig. F); scales small, 65-75 along lateral line
-> Northern pikeminnow, Ptychocheilus oregonensis
|
| 5b) |
Mouth small, in profile it does not reach front margin of eye (Fig. G); scales large, 35-38, along lateral line
-> Brassy minnow, Hybognathus hankinsoni
|
