My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
8007
CWCB
>
UCREFRP
>
Public
>
8007
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
7/14/2009 5:02:32 PM
Creation date
5/17/2009 11:27:26 PM
Metadata
Fields
Template:
UCREFRP
UCREFRP Catalog Number
8007
Author
Modde, T.
Title
Fish Use Of Old Charley Wash
USFW Year
1997.
USFW - Doc Type
an assessment of floodplain wetland importance to razorback sucker management and recovery.
Copyright Material
NO
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
64
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
Show annotations
View images
View plain text
<br />6 mm light traps, three 2 mm or 4 mm light traps, and four trammel nets over a two day period. <br />Each sampling day two fyke nets, tall minnow traps and short minnow traps were baited with <br />commercial puppy chow. Traps receiving bait were assigned randomly. All four trammel nets <br />were set in a single morning. Nets were set for two hours. Habitat depth and vegetation types <br />(emergent vegetation, open water [with or without submergent vegetation] and flooded terrestrial <br />vegetation) were recorded for nets set in 1996. Catch rates from gear, by vegetation category and <br />depth, were tested with a randomized complete block anova design. Data from both short and <br />tall clover-shaped minnow traps were combined for analysis (they were identical in all features <br />but height). The GLM method of anova was used to test for differences in dates (block), <br />vegetation or depth (treatment) and interaction between block and treatment as provided by SAS <br />(SAS, 1987). Three depth intervals were tested within minnow traps (<0.5 m, 0.51 m - 1.5 m, <br />and> 1.5 m) and two within fyke net sets, <0.75 m and > 0.76 m, respectively (fyke nets could <br />not fish satisfactorily in depths less than 0.5 m). The partial sum of squares option was used in <br />defining significance. The four most abundant species captured in each gear type were tested <br />individually. <br /> <br />Results <br />Differences in gear types used among years to monitor relative abundance did not allow <br />direct comparison in catch per unit of effort among years. However, several trends in fish <br />capture rates and composition occurred within years. Gill and trammel nets were designed to <br />monitor the presence and abundance of larger fish. Capture data from these nets were dominated <br />by carp Cyprinus carpio through all three years of the study (Figure 5, Appendices 4,5, and 6). <br />In both 1994 and 1996 a general increase in fish caught per net set occurred over time and was <br />largely attributed to vulnerability of age-O carp to nets later in the summer. Length frequency <br />data indicated that in the week of 24- 31 August, 1994 age-O carp ranged in total length from 110 <br />to 150 mm (Figure 6) and became vulnerable to gill nets (Figure 5). Fish capture in gill nets rose <br />from an average of21.9 fish/net to 106.1 fish/net following the week of24-31 August and was <br />due almost exclusively to increased catch of age-O carp. <br />Capture rates of trammel nets in 1995 and 1996 were substantially less than 1994 and can <br />be attributed to the shorter set time. No increase in catch/net trend was observed in 1995, <br />although carp continued to dominate the catch composition. In 1996 a small trend in the increase <br />in fish caught/net occurred. Growth rates of age-O carp in 1996 were similar to that in 1994 and <br />age-O ranging up to 90 mm by 10 July. A small increase in number of catch/net was observed on <br />9 July, afterward sampling was suspended to begin draining. Catch rates offish in trammel nets <br />showed little increase through 1995. Although the composition was also dominated by carp, <br />length frequency data indicated 1995 age-O carp showed slower growth. <br />Seines and minnow traps were used to monitor the composition and abundance of smaller <br />and younger fish in the wetland. In 1994 shoreline seining was dominated by carp, fathead <br />minnows Pimephales promelas and red shiners Cyprinella lutrensis (Figure 7). Greater numbers <br />of fish were collected earlier in June and July. Fathead minnows were collected throughout the <br />year whereas carp increased in size and were not captured as frequently after 13 July. Red <br />shiners were abundant in mid July and decreased into late August. Length frequency data <br />indicated that fathead minnow, red shiners and green sunfish Lepomis cyanellus reproduced in <br />Old Charley Wash. Age-O fish fathead minnow and red shiner were present by at least 28 July <br /> <br />18 <br />
The URL can be used to link to this page
Your browser does not support the video tag.