FISHES OF STREAMS TRIBUTARY TO MONTEREY BAY 
57 
opercle, a similar one immediately behind the head, a third on middle of sides above base of ventrals, 
and a fourth on caudal peduncle. These spots enable one to identify young suckers at a glance when 
they are swimming among individuals of other species. 
This appears to be the most widely distributed fluvial species in the Pajaro system. It is repre- 
sented in each basin by large numbers of individuals which frequent all parts of the streams, living 
along with the trout in the cool, rapid creeks of the mountains, appearing in the warm, shallow ripples 
of the valleys, and thriving especially well in deep, turbid pools where algse and diatoms are abundant. 
Specimens may be seen in the brackish water near the mouths of the rivers, and they survive to the last 
in the detached pools of a desiccating stream. 
Measurements of 20 specimens follow. 
Measurements oe Twenty Specimens op Catostomus mniotiltus. 
Arroyo Seco Creek. 
Length of body nun . . 
200 
220 
205 
198 
148 
152 
128 
124 
123 
122 
Length head 
0. 24 
0. 245 
0. 25 
0. 245 
0. 24 
0. 25 
0. 25 
0. 25 
0. 25 
0. 25 
Depth body 
• 25 
• 245 
. 25 
. 26 
. 22 
. 225 
•25 
•235 
• 25 
• 23 
Depth caudal peduncle 
.09 
•095 
•095 
•095 
.09 
.09 
.09 
.09 
.085 
.09 
Length caudal peduncle 
•15 
• 15 
• IS 
. 16 
. 16 
•15 
• 15 
.165 
. 16 
•15 
Length snout 
. 12 
. I2S 
. 12 
• 13 
. 12 
. 12 
. 12 
• 13 
. 12 
. 12 
Diameter eye 
•045 
.04 
.04 
.04 
.04 
.045 
•045 
•045 
■05 
.045 
Interorbital width 
. 10 
. 10 
. 10 
. 105 
. 10 
. 10 
. 10 
. 10 
. 10 • 
. 10 
Depth head 
• 17s 
. 18 
. 18 
.i8s 
• 19 
. 18 
.18 
.18 
.18 
. 18 
Snout to occiput 
. 21 
. 21 
. 21 
. 21 
. 22 
. 22 
. 21 
•23 
. 22 
. 22 
Snout to dorsal 
*52 
•52 . 
•52 
•52 
• 515 
• 52 
•53 
•53 
•54 
• 54 
Snout to ventral 
•56s 
• 57 
•59 
•59 
•S8S 
•57 
•57 
•59 
• 58 
•59 
Length base of dorsal 
.165 
• 17 
. 16 
• 17 
• 17 
• 17 
. 16 
. 16 
. 16 
. 16 
Length base of anal 
.08 
. 08 
•075 
.08 
•075 
•075 
.075 
•075 
•075 
.07 
Height dorsal 
•17 
. i6s 
. 165 
• 17 
.18 
• 17 
• 17 
• 17 
.18 
.18 
Height anal 
.18 
• 17 
. 165 
. 165 
. 16 
. 16 
. 16 
• IS 
•17 
• 17 
Length pectoral 
. 19 
. 20 
• 19 
.18 
.18 
• 19 
.18 
.i8 
. 20 
. 20 
length ventral 
• 15 
• 15 
•14 
•145 
• 14 
• 14 
•IS 
• 13 
.14 
• 15 
Length caudal 
• 22 
. 22 
. 21 
. 22 
•23 
•23 
. 21 
•23 
•23 
• 24 
Dorsal rays 
12 
12 
12 
12 
13 
12 
II 
12 
II 
12 
Anal rays 
8 
7 
7 
7 
8 
7 
7 
7 
7 
8 
Scales lateral line 
60 
6r 
60 
57 
62 
61 
60 
58 
57 
63 
Scales above lateral line 
II 
12 
II 
12 
II 
IZ 
12 
II 
12 
12 
Scales below lateral line 
8 
9 
9 
9 
8 
8 
8 
8 
8 
8 
Scales before dorsal 
26 
27 
27 
26 
26 
27 
26 
27 
28 
28 
Pajaro River, Watsonville. 
Length of body mm . . 
162 
144 
133 
134 
128 
I 3 S 
121 
1 16 
107 
III 
Length head 
0. 24 
0. 25 
0. 26 
0. 24 
0. 25 
0. 235 
0. 24 
0. 25 
0. 25 
0. 23 
Depth body 
. 20 
. 21 
. 22 
•24s 
. 22 
. 20 
• 23 
. 20 
. 22 
. 21 
Depth caudal peduncle 
.09 
.09 
.09 
.09 
.09 
.09 
.09 
.09 
.09 
. 09 
Length caudal peduncle 
• 15 
• 155 
•IS 
. 16 
• 15 
. 16 
. 16 
•15 
• 15 
• IS 
Len^h snout 
. 12 
. II 
. 125 
. 12 
. 12 
. 12 
. II 
. 12 
. 11 
. 12 
Diameter eye 
.04 
•045 
•045 
•045 
•OS 
•045 
•05 
•05 
• 05 
•05 
Interorbital width 
. lO 
• 095 
. 10 
. 10 
. 10 
.09 
. 10 
. 10 
.09 
•093 
Depth head 
• 17 
.165 
•17 
• 17s 
.18 
• 17 
• 17 
• 17 
.18 
• 17 
Snout to occiput 
. 22 
. 21 
. 22 
. 21 
. 22 
. 20 
. 21 
. 21 
. 22 
. 21 
Snout to dorsal 
•52 
•51 
•S 3 
• 51 
• 52 
•51 
•54 
• 51 
•52 
•SI 
Snout to ventral 
• 58 
•57 
• 58 
•56 
• 59 
•575 
•59 
•59 
.58 
•59 
Length base of dorsal 
• 17 
. 16 
• 17 
. 18 
. 16 
. 16 
. 16 
. 16 
• 17 
. 16 
Length base of anal 
• 075 
.07 
.08 
.085 
. 08 
.08 
• 07 
• 07 
.08 
. 08 
Height dorsal 
.18 
.18 
. 20 
.18 
• 19 
• 19 
. 20 
.18 
. 20 
• 19 
Height anal 
• 17 
. 16 
• 19 
. 18 
. 16 
• 17 
• 17 
. 16 
.18 
• 17 
Length pectoral 
• 19 
. 20 
. 21 
. 20 
• 19 
. 20 
. 20 
. 20 
. 20 
. 20 
Length ventral 
. 16 
• IS 
. i6s 
. 16 
. 16 
• IS 
. 16 
. 16 
• 17 
. 16 
Length caudal 
•23 
•23 
• 245 
•23 
• 23 
•23 
.24 
.24 
•25 
.24 
Dorsal rays 
12 
12 
II 
12 
12 
II 
ir 
12 
ir 
12 
Anal rays . . 
7 
7 
7 
7 
7 
7 
8 
7 
7 
7 
Scales lateral line 
S8 
62 
62 
57 
61 
59 
59 
57 
Scales above lateral line 
12 
II 
12 
II 
12 
12 
Scales below lateral line 
10 
10 
8 
8 
8 
8 
Scales before dorsal 
26 
27 
27 
25 
28 
29 
29 
28 
29 
29 
