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

r

Table 18. Size at developmental interval (left) and gut phase (right) transitions for Catostomus discobo/us. 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) 11-12(13) 2 - 900 bend: 14( IS) 15-16(17)
Postflexion Mesolarva: (11)12-13(14) (12)13-14(15) 3 - Full loop: 15(16) 17-18
Metalarva: (15-)17 (18-)20 4 - Partial crossover: (16)] 7 18-20
Juvenile: 21-22(23) 26-27(28) 5 - Full crossover: (16)17-19(-21) (18)19-23(-25)

Table 19. Summary of morphometries and myomere counts by developmental phase for Catostomus discobo/us. See Figure
4 for abbreviations and methods of measurement and counting. Protolarvae with unpigmented eyes excluded.

Protolarvae (N=6)
x ciSD Range

Flexion
Mesolarvae (N=7)

x ciSD Range

Postflexion
Mesolarvae (N= 16)

x ciSD Range

Metalarvae (N=22)
x ciSD Range

Juveniles (N=16)
x ciSD Range

SL,mm: II If 10-13 13 l' 10-14 14 2' 11-17 19 2 17-22 28 6 21-40
TL,mm: 12 If 10-13 13 l' 11-15 16 2' 12-20 23 2 20-28 34 8 26-50
Lengths %SL:
AS to AE 2 0 2-2 3 1 2-4 5 1 3-6 7 1 5-8 8 1 6-9
PE 7 0 6-7 9 1 8-]0 II 1 9-13 131 12-15 14 1 12-16
OPl 14 1 13-15 18 ] 17-19 222 19-25 25 1 24-27 25 1 23-27
OP2 55 Ib 53-57 58 2 55-61 58 1 56-60
PY 781 77-79 66 12' 50-74 58 Ii 57-59
OPAF 40 14 29-62 26 5 22-37 32 4 26-40 54 10 42-70
ODF 34 6 27-43 39 3 36-43 46 2' 43-49
OD Slid 49-53 52 1 49-54 51 1 47-54
ill 62 l' 61-64 64 1 63-66 64 1 62-66
PV 80 0 79-81 772 74-79 79 1 76-81 76 1 75-78 75 1 72-76
OA 78 If 76-80 771 76-78 76 1 73-77
IA 83 If 82-85 84 1 82-86 83 1 81-84
AFC 110 1" 107-112 114 1 112-115 115 1 113-116
PC 104 1 103-104 106 1 105-107 113 3 109-116 121 2 116-124 123 1 120-124
Y 63 3 61-67 22 24' 0-53 2 4' 0-15
PI 5 1 3-6 101 9-11 12 1 11-13 15 1 13-19 18 1 15-20
P2 2 2 0-5 9 2 5.11 13 1 11-15
D 15 2b 11-17 19 1 17-21 21 1 19-23
A 7 If 6-8 II 2 8-13 14 1 12-16
Depths %SL:
at BPE 8 1 6-9 II 1 9-11 13 2 11-15 15 1 14-16 16 1 14-17
OPl 10 1 9-13 12 1 11-13 15 2 12-17 19 1 16-21 19 1 18-21
OD 14 2 12-17 10 1 9-12 II 3 8-17 17 2 14-20 19 1 16-21
BPV 5 1 4-6 6 0 5-6 7 1 5-8 10 1 9-11 111 10-14
AMPM 2 0 2-3 3 0 3-4 5 1 4-6 7 0 6-7 7 0 7-9
Max. Yolk 9 2f 6-12 2 3' 0-7 0 l' 0-2
Widths %SL:
at BPE 8 1 6-9 10 0 10-11 12 1 10-14 15 1 14-16 15 1 14-16
OPl 6 I 4-7 8 0 7-9 102 8-13 14 1 13-17 16 1 15-18
OD 10 1 8-12 6 0 5-6 7 2 6-10 12 2 9-15 15 1 12-17
BPV 3 1 3-5 4 0 3-5 5 1 4-6 6 1 5-7 8 1 6-9
AMPM 2 0 1-2 2 0 2-2 2 0 1-3 3 0 2-3 3 1 2-4
Max. Yolk 12 2f 9-15 3 4' 0-8 0 l' 0-2
Mvomeres:
toPY 38 1 37-39 31 8' 23-37 24 l' 23-24
OPAF 16 7 10-27 7 4 5-15 8 1 6-12 20 7 11-33
OP2 23 If 21-25 24 1 20-26 23 l' 22-24
ODF 13 3 8-18 15 1 14-18 18 2' 15-20
OD 19 2h 17-22 19 1 17-21 18 0' 18-19
PV 39 1 39-40 39 1 37-40 39 1 38-39 37 1 35-38 36 l' 35-38
Total 48 1 47-48 48 1 47-49 48 0 48-49 47 1 47-48 48 l' 47-48
After PV 8 1 8-9 9 1 8-11 10 1 9-10 101 9-12 II 1 10-12

'N = 5, bN = 10, 'N = 9, dN= 14, 'N = 8, fN= 7, gN ~ 15, hN = 13, 'N~ 18,JN = 2.

53