7404

• UCREFRP Catalog Number: 7404
• Author: Masslich, W. J. and A. Wasowicz.
• Title: Interim Report - 1990 Overwinter Survival of Age-0 Colorado Squawfish in the Green and Colorado Rivers.
• USFW Year: 1990.
• USFW - Doc Type: Logan, Utah.
• Copyright Material: NO

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'Tble 7. Number of juvenile Colorado squawfish and range in total length for the 1987-1990
year classes in Reach 3, Green River'.
SAMPLE NO. SEINE HAULS NO.
PERIOD (with JUV) JUV RANGE IN TL (mm)

-1987 YEAR CLASS--
Fall '87 32 (2) 4 62-87
Spring '88 40 (1) 4 8G-104
--1988 YEAR CLASS--
Fall '88 36 (18) 60 61-99
Spring '89 27 (7) 10 72-101
--1989 YEAR CLASS--
Fall '89 94 (21) 58 70-131
Spring '90 90 (23) b8 75-162
--1990 YEAR CLASS--
Fall '90 84 (14) 21 b1-88
'- Data for Fall 1989 from USFWS ISMP Draft Report, March 12, 1990
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Table 8. Number of YOY Colorado squawfish, CPE, and mean total length for the 1987,1988 and
1989 year classes in Reach 1, Colorado River (RM 50-0).
SAMPLE NO. SEINE HAULS NO. CPE (#/100mZ) MEAN TL (mm)
PERIOD (with YOY) YOY (st. dev) (range)
--1987 YEAR CLASS-
Fall '87 30 (7) 31 1.7 (3.4) 44 (20-b0)
Spring '88 32 (8) 8 1.0 (2.3) 57 (47-60)
--1988 YEAR CLASS--
Fall '88 40 (28} 89 6.3 (8.4) 42 (22-60}
Spring '89 31 (23) 187 16.8 (24.8) 45 (27-70)
--1989 YEAR CLASS--
Fall '89 40 (24) 120 6.31 (9.68 4f1(24-67)
Spring '90 34 (8) 14 2.11 (4.95) 41 (29-54)