9499

• UCREFRP Catalog Number: 9499
• Author: Osmundson, D. B.
• Title: Removal of Non-native Centrarchids from Upper Colorado River Backwaters, 1999-2001
• USFW Year: 2003.
• USFW - Doc Type: Summary of Results.
• Copyright Material: NO

50
40
30
20
10
n
----------
Largemouth bass ®2000-fall
32.68 -----....
30.24
24.6a--------------------------------------------------------- ---------------------.....---
n=410
-5.-12--------------------------- -------------------------------- .----------
0.24 0.24 0 0 0 0 0 0 0
C
50
..
-----------------------
;
L 40 ---------------------36.6

Q 30
20 ------------ 3:4--
C 10 ---
----
0
(1) 0
1
_--------------------------- ------- --
28.35
15.4fr---------------------
3:61 1.03
--------------------------
--------------------------
--------------------------
--------------------------
----------- --------------
0 0.52 0.52
®2001-spring ........
-------------------------------
n=194
--------------------------------------------
----------------------- ............
0 0 0 0.52 0
50 -----------
40 ------- ------------------------------ ®2001-Fall
i- 31.25
LL 30 -------------------- 21 ----. 6-8
n = 64
20 ------------------- ---- -------- -------------------------------------------- -------
10.94 9.38
0 3.13 1 1.56 0 0 0 0 0
0
25-49 75-99 125-149 175-199 225-249 275-299 325-349 375-399
50-74 100-124 150-174 200-224 250-274 300-324 350-374
50 --- ------ -- ---- ---- -- -
40 Green sunfish ®2000-fall -fail------
30 - - - - - - - - - - - - - - - - - - - - - - - - --- - - - - - -- ------------------ ---- - ------- - ------------------------------------------------_ ----------------------
19.67 22 13 n = 122
20 ------------------------------------------ 12--.3 2-.3- 1 - 3 --- .1 - 1 --- 1--3 -- .1 - 1 ------------------------------------------------------------------
10 6.56- 9.02
------------ - -- - ----------- --
0 0 0.82 0.82 IMM 1.64 0.82
4-? 0
50 - - -
02001-spring ____
a)
Q 30 ------------------------------------- -----------------z3a------------------------------------------------: -----------------------------
20 - - - 1.7..3._ 17 s2_ n=318
13.21 10.38
0 10 ---0-- 0.31 1.57 3.46---- 4.4- ME-5.35 ---1-----57 0--- 0.31 0 0 0 0
a) 0
: 50 ------------------------------------------------------------------------------------------------------------ -------
40 02001-Fall
---------------------------------------------------
LL 30 ------------------------------------------------------------------- -----
18.63 21 57 18.63 n - 102
- ---------------
20 ---------------------------------------------------------------- - -
11.76 11.76
--------------------------------------------------------
10 ---------------------
0 0.98 p 1.96 EM M 0.98 2.94 1.96 0 0 0 0
20-29 40-49 60-69 80-89 100-109 120-129 140-149 160-169 180-189
30-39 50-59 70-79 90-99 110-119 130-139 150-159 170-179 190-199
Length class (mm)
Figure 7. Length frequency (total length) of largemouth bass (upper) and green sunfish
(lower) captured from Horsethief backwater during three seasons when the backwater
remained isolated from the main channel.
15