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

Transition to mmSL mmTL Transition to mmSL mmTL
Flexion Mesolarva: 11 11-12 2 - 900 bend: 14 16
Postflexion Mesolarva: 12-13 13-14 3 - Full loop: 16-17 20-21
Metalarva: 15-16(17) (17) 18-19(20) 4 - Partial crossover: 18-2 i (22) 22-25(-27)
Juvenile: 21-22 26-27 5 - Full crossover: (19)20-23(-25) (23)24-28(-31)

Table 9. Summary of morphometries and myomere counts by developmental phase for Catostomus catostomus. See Figure
4 for abbreviations and methods of measurement and counting. Protolarvae with unpigmented eyes excluded.

Flexion
Protolarvae (N= 16) Mesolarvae (N= II)

x "=SD Range x "=SD Range

Postflexion
Mesolarvae (N=19)

x "=SD Range

Metalarvae (N=26)
x "=SD Range

Juveniles (N=26)
x "=SD Range

SL,mm: 9 I 7-11 12 I 11-13 14 I 12-17 18 2 15-21 30 6 22-41
TL,mm: 101 8-12 131 11-14 16 2 13-20 21 3 17-26 36 8 27-50
Lengths %SL:
AS to AE 3 I 2-4 3 I 3-4 4 I 3-6 6 I 4-9 8 I 6-11
PE 9 I 8-10 9 I 8-11 12 2 9-14 131 11-16 15 I 13-18
OPI 16 I 15-18 18 I 16-21 23 2 19-26 25 2 22-28 27 I 24-30
OP2 51 l' 50-52 52 I 50-54 56 2 53-59 57 I 55-59
PY 76 2b 71-80 71 ' 71-71
OPAF 39 19 22-72 27 2 23-31 32 4 25-40 49 9 35-66
ODF 43 3 39-49 42 I 39-44 45 I 42-47 460d 46-47
OD 48 0' 48-49 48 I' 47-49 49 I 47-52 50 I 49-53
ill 62 If 60-63 63 I 60-66 64 I 62-65
PV 79 I 76-81 781 75-79 78 I 77 -80 771 75-79 76 I 74-78
OA 78 1" 76-78 76 I 74-78 76 I 75-77
IA 84 I h 82-85 84 I 83-85 84 I 82-85
AFC 106 I' 105-107 112 2' 107-115 116 I 114-119 116 I 115-118
PC 104 I 103-106 106 I 105-109 114 3 108-118 120 I 117-122 121 I 119-123
Y 52 15 0-64 3 10 0-34
PI 7 2 4-11 II I 11-12 131 11-15 16 2 13-19 17 I 15-19
P2 I 2 0-4 6 2 3-11 11 2 6-13 131 11-15
D 16 If 14-18 19 I 17 -21 20 I 18-22
A 8 Ii 7-9 11 I 9-13 14 I 12-16
Depths %SL:
at BPE 9 I 8-11 III 9-13 14 2 11-18 17 2 14-19 17 I 16-19
OPI 11 I 10-12 12 I 10-14 16 2 11-19 19 2 16-22 20 I 18-22
OD 122b 8-15 101 8-11 14 2 11-19 18 3 13-22 20 I 19-22
BPV 6 I 3-7 6 I 5-7 7 I 6-10 10 2 7-13 12 I 11-13
AMPM 3 I 2-4 4 I 3-5 6 I 5-8 7 I 5-9 9 I 7-10
Max. Yolk 7 4 0-13 o I 0-2
Widths %SL:
at BPE 9 I 7-11 11 I 10-13 14 I 12-16 16 I 14-17 17 I 15-19
OPI 6 I 6-8 8 I 6-10 11 2 9-15 15 2 11-18 17 I 16-18
OD 7 2b 5-12 6 I 5-7 9 3 6-14 13 3 8-18 16 2 13-19
BPV 4 0 3-4 4 0 4-5 5 I 4-7 7 2 4-10 9 I 7-10
AMPM 2 0 2-3 2 0 2-3 3 I 2-5 4 I 2-5 4 I 3-6
Max. Yolk 8 4 0-14 o I 0-3
Mvomeres:
toPY 35 I b 33-37 33 ' 33-33
OPAF 14 10 5-31 6 I 6-7 8 I 6-11 16 6 9-27
OP2 21 l' 20-22 21 I 19-22 22 I 19-25
ODF 15 I 13-17 16 I 14-17 16 I 13-18 16 Od 16-16
OD 19 0' 19-19 18 I' 16-20 17 I 15-19
PV 37 I 36-39 38 I 37-39 38 I 36-39 36 I 34-38
Total 47 2 45-49 47 I 45-49 47 I 45-49 46 I 44-48
After PV 10 I 8-11 9 I 8-11 9 I 8-10 10 I 9-11

'N= 3, bN= 15, 'N= I, dN=4, 'N= 18, fN= 11, gN= 16, hN= 9, iN= 8.

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