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

Transition to mmSL mmTL Transition to mmSL mmTL
Flexion Mesolarva: 12-13 12-14 2 - 900 bend: 14-17 17-19
Postflexion Mesolarva: 13-14 14-15 3 - Full loop: 18-19 (19-)22-24
Metalarva: 15-17 17-19(20) 4 - Partial crossover: 20-22 26-27
Juvenile: 19-20 23 5 - Full crossover: 27-28 34-35

Table 4. Summary of mOlphometrics and myomere counts by developmental phase for Catostomus ardens. See Figure 4 for
abbreviations and methods of measurement and counting. Protolarvae with unpigmented eyes excluded.

SL,mm: 11 1 9-13 13 1 12-14 15 1 13-17 17 1 15-19 25 4 19-36
TL,mm: 11 1 9-14 13 1 12-15 16 2 14-19 21 2 17-23 32 6 24-45
Lengths %SL:
AS to AE 2 0 2-3 2 1 1-4 4 1 3-5 6 1 4-8 7 I 6-8
PE 8 I 7-9 8 1 7-10 11 1 10-12 14 1 12-16 15 1 14-16
OPl 15 1 12-17 17 2 15-19 20 1 19-23 26 1 23-27 26 1 25-28
OP2 52 Ib 50-53 56 1 53-57 56 1 55-58
PY 75 2 72-78 70 2" 69-72
OPAF 41 19 22-67 25 1 22-26 28 2 25-31 41 7' 30-51
ODF 33 2 29-36 35 2 31-36 39 1 37-41 44 3' 42-47
aD 49 l' 47-50 50 1 49-52 49 1 48-51
ill 62 1 d 60-63 65 1 64-67 65 1 64-66
PV 78 1 76-80 76 1 75-77 79 1 76-80 771 76-78 75 1 73-76
OA 79 ' 79-79 771 76-78 76 1 74-78
IA 84 ' 84-84 84 1 84-86 83 1 82-85
AFC 109 1 107-110 112 l' 111-114 116 1 114-118
PC 103 1 102-104 105 1 104-106 112 3 109-117 120 2 118-122 125 1 123-128
Y 57 5 49-64 16 22 0-43
PI 5 3 1-8 101 8-11 111 9-13 14 2 12-17 20 2 15-22
P2 2 3 0-6 11 1 8-12 14 1 12-16
D 15 1 d 14-16 19 I 18-20 24 2 21-26
A 7 ' 7-7 10 I 9-12 15 2 12-18
Depths %SL:
at BPE 9 1 7-10 101 9-12 131 11-15 16 ] 15-]8 18 0 17-18
OP1 10 1 9-13 101 9-]2 14 ] ]2-17 18 1 16-20 20 1 18-2]
aD ]1 ] 10-12 9 1 8-9 12 2 9-15 17 1 16-20 20 1 16-22
BPV 5 1 4-6 5 0 5-6 7 1 6-9 101 9-12 12 1 10-14
AMPM 3 0 2-3 3 0 3-4 5 I 4-6 7 0 6-8 8 0 7-8
Max. Yolk 7 2 3-11 o 1 0-2
Widths %SL:
at BPE 8 1 6-10 9 1 9-10 12 1 10-13 15 1 14-16 16 1 15-]6
OP1 6 1 4-8 7 1 6-9 10 1 9-1 ] 131 11-15 16 1 14-17
aD 7 1 5-9 5 0 5-6 7 ] 5-10 12 1 9-13 15 1 12-17
BPV 3 0 3-4 3 0 3-4 5 1 4-6 6 1 5-7 8 1 6-10
AMPM 2 0 2-2 2 0 2-2 3 0 2-3 3 0 3-4 4 0 3-5
Max. Yolk 8 3 5-14 1 1 0-2
Mvomeres:
to PY 35 1 34-36 33 1" 32-33
OPAF 15 11 4-32 6 0 6-7 6 1 5-7 12 4' 6-17
OP2 21 1 b 19-22 21 1 20-22 22 Od 21-22
ODF ]2 ] 10-13 12 0 11-12 13 1 ]2-14 15 2' 13-16
aD 18 l' 17-19 17 1 16-18 17 1 d 16-18
PV 37 1 36-38 36 1 36-37 37 1 35-38 36 1 34-37 35 1 d 35-36
Total 46 1 45-47 46 1 45-47 46 1 45-48 45 1 43-47 46 1d 45-47
After PV 9 1 8-10 101 9-10 9 1 7-10 9 1 8-10 10 ld 9-11

Proto larvae (N = 1 0)
x *SD Range

Flexion
Meso1arvae (N=5)

x *SD Range

Postflexion
Meso1arvae (N=12)

x *SD Range

Meta1arvae (N~12)
x *SD Range

Juveniles (N=12)
x *SD Range

'N=2, bN= 10, 'N= 11, dN=5, 'N= 1.

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