My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
8082
CWCB
>
UCREFRP
>
Copyright
>
8082
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
7/14/2009 5:01:46 PM
Creation date
5/20/2009 5:10:26 PM
Metadata
Fields
Template:
UCREFRP
UCREFRP Catalog Number
8082
Author
Hubert, W. A. and T. M. Patton
Title
Fish Catches with Hoop Nets of Two Designs in the Laramie River, Wyoming
USFW Year
1994
USFW - Doc Type
Prairie Naturalist
Copyright Material
YES
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
10
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 />8 <br /> <br />Prairie Naturalist 26(1 ): March 1994 <br /> <br />and lower catches of northern redhorse, white suckers, and longnose suckers, in <br />1991 than in 1992. The flow of the Laramie River differed between the study years. <br />Mean_daily flows dwing the sampling months were substantially greater in May and <br />June 1991 (3.9 and 5.7 m3/second, respectively) than in 1992 (1.1 and 1.3 m3/ <br />second, respectively), but there was little difference in July and August (range = 1.2- <br />2.1 m3/second). It is likely that catch rates of common carp, channel catfish, and <br />smallmouth bass were enhanced by higher flows with associated greater turbidity <br />and current velocity or the ability of the fishes to migrate over water diversion dams <br />in 1991. Similar patterns of higher catches with greater flows have been described <br />for common carp and channel catfish in other streams (Mayhew 1973, Hubert and <br />Schmitt 1982). Reduced catch rates of northern redhorse with higher flows also <br />were observed by Hubert and Schmitt (1982) on the Mississippi River. <br />A seasonal pattern of hoop net catches, with highest catch rates in early <br />summer and a decline into late summer and fall, has been observed among several <br />studies (Smith and Hubert 1989, Gerhardt and Hubert 1989, Hubert and O'Shea <br />1991). Higher catch rates of common carp, channel catfish, and smallmouth bass <br />during early swnmer in the Laramie River likely were associated with spawning <br />activity. <br />The habitat in which hoop nets are placed can influence catch rates (Hubert <br />and Schmitt 1982, Holland and Peters 1992). There was little variation in habitat <br />among the eight study sites in the Laramie River with a couple of exceptions. Site <br />3 (Fig. 1) was at the upstream end of a pool fonned by a water diversion dam. Sites <br />4, 5, and 6 had slightly higher gradients and more rocky substrate than other sites. <br />Higher catch rates of smallmouth bass and longnose suckers at Sites 4, 5, and 6 may <br />be associated with these habitat features. <br />Mesh size has been related to catch efficiency and species selectivity of hoop <br />nets. Holland and Peters (1992) found increasing catch rates with decreasing mesh <br />size in the Platte River, Nebraska, and this relation has been supported by other <br />studies (Starrett and Bamickol 1955,Hesseetal. 1982). Hubert and Schmitt (1982) <br />observed higher catch rates in larger-mesh nets, but substantial species selectivity <br />was noted. Species selectivity of hoop nets with different mesh sizes also was noted <br />by Starrett and Bamickol (1955). Small-mesh hoop nets may be selective for fishes, <br />such as catfish, associated with instream cover (Starrett and Barnickol1955, Hubert <br />and Schmitt 1982, Holland and Peters 1992). Small mesh sizes may provide more <br />shade orreduction in current velocity to attract cover-oriented fishes. The two types <br />of hoop nets used in the Laramie River had identical mesh at the cod ends, but D nets <br />had smaller mesh (3.8 cm bar measure) than the round nets (5.0 cm) at the open end. <br />The D nets may have provided more shade or cover; however, the D nets seemed <br />to be selective only for northern redhorse, a schooling species not associated with <br />instream cover. <br />The catch rates for fishes in both types of hoop nets in the Laramie River <br />downstream from Grayrocks Dam (approximately 50 fish/lOO net-nights) was <br />about an order of magnitude less than in the Powder River and Crazy Woman Creek, <br />
The URL can be used to link to this page
Your browser does not support the video tag.