9550

• UCREFRP Catalog Number: 9550
• Author: Snyder, D. E. and R. T. Muth.
• Title: Catostomid Fish Larvae and Early Juveniles of the Upper Colorado River Basin - Morphological Descriptions, Comparisons, and Computer-interactive Key.
• USFW Year: 2004.
• USFW - Doc Type: Fort Collins, CO.
• Copyright Material: NO

Table 13. Size at developmental interval (left) and gut phase (right) transitions for Catostomus commersoni. See Figure 5
for phases of gut folding. Rare or questionable extremes in parentheses.

Transition to mmSL mmTL Transition to mmSL mmTL
Flexion Mesolarva: 10-12(13) 10-13 2 - 900 bend: 14-15(16) (16)17(18)
Postflexion Mesolarva: (12)13-15 (13)14-16 3 - Full loop : (16)17-18 (19)20-21(22)
Metalarva: 15-16(17) 18-19(20) 4 - Partial crossover: 19-20(21 ) (22)23-24(-26)
Juvenile: (17 -) 19-20 (21-)23-24 5 - Full crossover: (20)21-25 (24)25-30(31)

Table 14. Summary ofmorphometrics and myomere counts by developmental phase for Catostomus commersoni. See Figure
4 for abbreviations and methods of measurement and counting. Proto1arvae with unpigmented eyes excluded.

SL,mm: 101 8-12 12 2 10-15 14 1 12-16 17 1 15-20 25 6 19-39
TL,mm: 10 1 9-12 13 2 10-16 16 2 14-19 21 2 18-24 30 7 23-48
Lengths %SL:
AS to AE 2 0 2-3 2 1 2-3 4 1 2-6 6 1 4-8 8 1 6-10
PE 8 1 8-9 8 1 7-10 111 9-14 14 1 12-15 15 1 13-16
OP1 16 1 13-19 18 1 16-20 22 2 19-25 26 2 20-30 28 1 24-29
OP2 53 1b 52-54 56 2 54-59 57 2 52-59
PY 70 12 47-80 63 10' 50-75
OPAF 31 15 22-73 25 1 23-27 30 2 25-33 48 10 32-68
ODF 37 2 34-42 38 2 35-43 44 3' 38-48
OD 50 1b 49-51 51 1 48-53 51 I 48-53
ill 63 1d 61-64 65 2 61-67 65 I 61-68
PV 78 2 76-82 79 1 76-81 80 1 78-81 771 75-79 76 1 72-78
OA 80 1d 79-80 78 1 76-79 771 73-79
IA 85 1d 84-86 85 1 83-86 84 1 79-86
AFC 110 2 108-113 113 2 110-119 115 1 113-117
PC 104 1 101-106 106 1 104-109 114 4 109-120 121 2 116-126 122 1 119-124
Y 51 13 26-63 18 21 0-50
PI 7 4 2-12 111 10-12 12 I 11-14 15 2' 12-19 17 1 15-20
P2 2 2 0-6 9 3 4-16 12 1 10-15
D 17 1 d 16-17 19 2 15-22 20 1 18-24
A 7 Od 7-7 11 2 7-14 132 10-16
Depths %SL:
at BPE 9 1 7-11 10 1 9-11 13 1 11-15 16 1 14-19 17 1 16-19
OP1 111 9-12 1 11 10-13 16 2 14-18 18 1 16-20 20 1 18-22
OD 10 2 8-13 9 1 8-10 12 2 9-16 16 2 13-20 19 1 17-22
BPV 5 1 3-6 5 0 5-6 7 1 6-9 9 1 7-11 11 1 10-14
AMPM 3 1 2-3 4 0 3-4 5 1 4-7 7 I 5-8 8 1 7-9
Max. Yolk 6 3 1-11 1 1 0-3
Widths %SL:
at BPE 9 2 7-11 101 9-12 13 1 11-15 15 1 13-17 16 1 14-18
OP1 6 1 5-7 7 1 6-8 10 I 8-12 131 11-14 16 2 13-20
OD 6 1 5-9 5 0 5-6 7 1 5-9 10 2 8-14 13 2 10-16
BPV 4 0 3-4 4 0 3-4 5 1 4-6 6 1 4-8 8 1 7-10
AMPM 2 0 2-2 2 0 2-2 3 0 2-3 3 1 2-4 40 4-5
Max. Yolk 6 3 1-10 1 2 0-4
Mvomeres:
toPY 33 7 18-38 28 6' 21-35
OPAF 9 7 4-30 6 1 5-8 6 1 5-8 16 6 7-28
OP2 21 1 b 19-22 21 1 20-23 21 If 20-22
ODF 131 12-14 14 1 12-17 15 2d 12-17 14 2' 11-17
OD 19 1b 17-20 17 I' 16-19 17 If 16-18
PV 38 2 35-40 37 2 34-40 38 1 36-40 35 I 34-37 35 If 33-36
Total 47 1 44-48 46 1 43-48 46 I 45-49 45 1 44-47 45 If 43-47
After PV 9 1 8-10 9 1 7-11 9 I 8-9 10 1 8-12 10 If 9-12

Proto larvae (N= 11)
x "=SD Range

Flexion
Meso1arvae (N=16)

x "=SD Range

Postflexion
Meso1arvae (N=9)

x "=SD Range

Metalarvae (N=18)
x "=SD Range

Juveniles (N=25)
x "=SD Range

'N= 8, bN=7, 'N= 8, dN= 3, 'N= 17, fN=20.

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