7724

• UCREFRP Catalog Number: 7724
• Author: Snyder, D. E.
• Title: Contributions to a Guide to the Cypriniform Fish Larvae of the Upper Colorado River System in Colorado.
• USFW Year: 1981.
• USFW - Doc Type: \
• Copyright Material: NO

GILA CYPHA 25

MEANS AND RANGES OF SELECTED MORPHOMETRIes, EXPRESSED AS PERCENT STANDARD LENGTH, AND MYOMERE COUNTS for
each larval phase and the early juveniles. See Figure 4 for explanation of abbreviations and method-
ology of counts and measures. Superscripts in the table indicate the number of specimens on which the
value is based if less than the number given in the column heading.

Protolarvae N = 26 Meso 1 a rvae N = 21 Metalarvae N = 4 Juvenil es N = 16
Mean z SO Range Mean z SD Range Mean :!: SD Range Mean :!: SO Range
Size,mmSL - 8.2 z 0.6 7.2-9.4 9.8 :!: 1.0 8.7-12.9 15.2 :!: 1.5 1 3 . 6- 1 7 . 1 29.3 6.3 20.9-43.0
mmTL - 8.5 z 0.7 7.5-9.6 10.5z1.3 9.3-15.4 18.8:!:2.1 16.5-21.1 36.6 810 26.4-53.2
Lengths, anterior margin of the snout to:
AE 3 z 1 2-5 4 :!: 2 2-5 5 :!: 1 4-6 6 z 1 5-7
PE 9 :!: 1 10 :!: 1 8-12 13 :!: 1 11-14 12 :!: 1 10-14
OPl 1723 :!: 4 21 :!: 2 18- 24 26 z 2 25-28 25 z 2 21-28
OP2 451 47 z 1 46-47 45:!: 1 42-46
00 503 z 0 50-50 50 z 1 49-51 49 :!: 1 46-50
ID 613 :!: 1 61-62 64 z 1 62-65 62 :!: 1 61-64
PV 65 :!: 1 62-68 66 :!: 2 62-70 66 :!: 1 65-67 64 :!: 1 62-66
IA 74 :!: 1 73-74 75 :!: 1 74- 75 75 :!: 1 74-77
AFC 110 :!: 1 109-112 112 :!: 1 111-113 112 z 1 111-114
PC 104 :!: 1 102-106 109 z 4 104-119 123 z 2 121-126 125 :t 2 121- 1 28
Fin lengths: g21
Pl - :t 2 5-12 12 :!: 1 1 0- 1 4 14 :!: 1 1 3- 1 5 17 :!: 1 15-19
P2 71 10 :!: 3 7-12 15 :!: 2 14-16
D 15 :!: 3 12- 18 20 :!: 2 18-23 23 :!: 1 21-25
A 11 :!: 1 10-12 15 :!: 2 13-17 18 :!: 3 14-21
Body depths at or just behind (B-):
BPE 12 :!: 1 10- 14 14 :!: 1 12- 17 18 :t 1 17-18 16 :!: 1 1 4- 1 9
OPl 1522 :!: 3 13-21 14 :t 2 12-19 21 :t 1 20-22 23 :!: 1 22-26
OD 14 :t 1 10-17 13 :!: 2 10-17 19 z 4 16- 24 26 :!: 3 23- 28
BPV 8 :t 1 6-12 8 :!: 1 7-11 14 :!: 2 12-16 17 :!: 1 15-19
AM PM - 4 :!: 1 3-5 5 :!: 1 3-8 8 :!: 1 7-9 8 :t 1 6-9
Body wi dths at or just behind (B-):
BPE 12 :!: 1 10- 1 3 14 :!: 1 12- 18 17 :!: 1 16- 18 17 :t 1 15-18
OPl 922 :t 1 7-10 12 :t 1 10- 1 7 18 :t 1 17-19 18 :t 3 15-20
00 7 :t 1 5-9 6 :t 1 5-11 13 :t 4 10-18 19 :t 2 16- 24
PBV 5 :!: 1 4-6 5 :!: 1 4-9 10 :!: 1 9-11 13 :!: 1 12-14
AMPM - 2 z 0 2-3 2 :!: 1 2-3 4 :t 1 4-5 4 :!: 1 3-5
Myomere counts:
to OP2- 161 15 :t 1 14- 16 157 :!: 1 14-16
to OD - 183 :!: 1 17-19 18 :!: 1 18-19 187 :!: 0 18-19
to PV - 29 :t 1 26-30 29 :!: 1 27-30 29 :!: 1 28-30 287 :!: 1 27-29
PV-MPM- 16 :t 1 1 5- 19 16 :!: 1 15- 20 17 z 1 16-18 177 :!: 1 17-18
tota 1 - 45 :!: 1 43-48 45 :!: 1 44-49 46 :!: 1 45-46 467 :!: 1 45-46
SELECTED ADULT MERISTICS. Mean or modal values are overlined, if significant, and rare or questionable
extremes are enclosed by parentheses. 1

Drays:
A rays:
Crays:
P2 rays:

ii, (8.21- 10
ii ,9-10-11
xi-x,19,xi-x
(8)9-10

Pl rays: (15 )l6-T7-1 B- (19)
Branchiostegal ra~: 3
Gill rakers: 20-24-28
Pharyngeal teeth: 2,5 / 4, 2

Vertebrae: 45-46-47-
48(49)
Scales, lateral series:
73-76-87-90

SIZE (mm SL / TL) AT THE APPARENT ONSET OF SELECTED OEVELOPMENTAL EVENTS. Based on structures observable
under low power magnification; rare or questionable extremes are enclosed in parentheses.

Hatching: 6-7 / 7
Eyes pigmented: prior to hatching
Pl bud formation: 7-8 / 8
P2 bud formation: <13/15
Yolk completely absorbed: 8-9 / 9
Finfold completely absorbed: 21-22 / 26-27
Gut coil or loop formation, es evidenced by
at least a 900 bend: > 14 / 17, < 17 / 21
Segmentation evident in the principal rays
of all fins: 16-17 / 20-21

Fin rays
Principal C:
Secondary C:
Principal D:
Principal A:
All P1:
All P2:

First observed
9 / 9-10
10- 11 / 11- 12
10 / 11
10 / 11
10- 11 / 1 2
11-12 / 13

Adult complement
< 14 / 17
< 16 / 20
< 13 / 15
< 14 / 17
17 / 21
16 / 20

Scales: initial appearance:
full coverage:

IBased in part on data from: Holden and Stalnaker (1970), Minckley (1973), Sigler and Miller (1963) and
Suttkus and Clemmer (1977).