FACTORS INFLUENCING DECREASED GROWTH OF TROUT IN ASHURST LAKE (ARIZONA)

Persistent Link:
http://hdl.handle.net/10150/276481
Title:
FACTORS INFLUENCING DECREASED GROWTH OF TROUT IN ASHURST LAKE (ARIZONA)
Author:
Simms, Jeffrey Randall, 1962-
Issue Date:
1987
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Before 1980, Ashurst Lake had an exceptionally productive rainbow trout fishery. More recently, Ashurst has become turbid and trout growth rates have declined substantially. The growth, condition, and food habits of a single cohort of rainbow trout was followed from May 1985 until October of 1986. The first year, trout in Ashurst grew from 66 mm to 164 mm in 5 months. Growth reached an average of 24 mm/month from June to September, a time when trout fed primarily on Daphnia. By July of the second year, growth had stopped and condition declined substantially in conjunction with a change in their diet from Daphnia to crayfish and minnows. The decrease in growth rate was attributed to a decrease in the food base coupled with hampered foraging abilities of rainbow trout in water with high turbidity. High tubidity may have resulted from erosion of the surrounding watersheds.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Rainbow trout.; Trout fisheries -- Arizona.; Ashurst Lake (Ariz.)
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College; Renewable Natural Resources
Degree Grantor:
University of Arizona

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleFACTORS INFLUENCING DECREASED GROWTH OF TROUT IN ASHURST LAKE (ARIZONA)en_US
dc.creatorSimms, Jeffrey Randall, 1962-en_US
dc.contributor.authorSimms, Jeffrey Randall, 1962-en_US
dc.date.issued1987en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractBefore 1980, Ashurst Lake had an exceptionally productive rainbow trout fishery. More recently, Ashurst has become turbid and trout growth rates have declined substantially. The growth, condition, and food habits of a single cohort of rainbow trout was followed from May 1985 until October of 1986. The first year, trout in Ashurst grew from 66 mm to 164 mm in 5 months. Growth reached an average of 24 mm/month from June to September, a time when trout fed primarily on Daphnia. By July of the second year, growth had stopped and condition declined substantially in conjunction with a change in their diet from Daphnia to crayfish and minnows. The decrease in growth rate was attributed to a decrease in the food base coupled with hampered foraging abilities of rainbow trout in water with high turbidity. High tubidity may have resulted from erosion of the surrounding watersheds.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectRainbow trout.en_US
dc.subjectTrout fisheries -- Arizona.en_US
dc.subjectAshurst Lake (Ariz.)en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineRenewable Natural Resourcesen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.identifier.proquest1331426en_US
dc.identifier.oclc17566053en_US
dc.identifier.bibrecord.b16335739en_US
dc.identifier.bibrecord.b18372089en_US
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