Distribution and feeding interactions of the threadfin shad and juvenile gamefish in Patagonia Lake

Persistent Link:
http://hdl.handle.net/10150/276658
Title:
Distribution and feeding interactions of the threadfin shad and juvenile gamefish in Patagonia Lake
Author:
Cashman, Michael Robert, 1953-
Issue Date:
1988
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:
Distribution, diet, and food availability for young-of-the-year (YOY) largemouth bass (Micropeterus salmoides), YOY bluegill (lepomis macrochirus) and threadfin shad (Dorosoma petenense) were studied to reveal any potential interactions in Patagonia Lake, a 170 ha (265 acre) recreational impoundment in Santa Cruz County, Arizona. Threadfin shad, a forage species, were stocked to enhance the growth of bass. As shad became abundant, limnetic zooplankton declined, reducing the primary food supply of the YOY game fish. Diet analysis showed very little food overlap between YOY gamefish and threadfin shad. Shad ate phytoplankton when zooplankton became scarce, and continued to grow well and reproduce. As zooplankton decreased, YOY gamefish shifted their diets to aquatic insects. After the shift, the gamefish did not grow well. The continuous overgrazing of zooplankton by large numbers of threadfin shad had an impact on the growth of the juvenile largemouth bass and bluegills. This impact may result in weak year classes in the future.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Fishes -- Feeding and feeds -- Arizona -- Patagonia Lake.; Threadfin shad.; Bluegill.; Largemouth bass.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College; Renewable Natural Resources
Degree Grantor:
University of Arizona
Advisor:
Ziebell, Charles D.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleDistribution and feeding interactions of the threadfin shad and juvenile gamefish in Patagonia Lakeen_US
dc.creatorCashman, Michael Robert, 1953-en_US
dc.contributor.authorCashman, Michael Robert, 1953-en_US
dc.date.issued1988en_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.abstractDistribution, diet, and food availability for young-of-the-year (YOY) largemouth bass (Micropeterus salmoides), YOY bluegill (lepomis macrochirus) and threadfin shad (Dorosoma petenense) were studied to reveal any potential interactions in Patagonia Lake, a 170 ha (265 acre) recreational impoundment in Santa Cruz County, Arizona. Threadfin shad, a forage species, were stocked to enhance the growth of bass. As shad became abundant, limnetic zooplankton declined, reducing the primary food supply of the YOY game fish. Diet analysis showed very little food overlap between YOY gamefish and threadfin shad. Shad ate phytoplankton when zooplankton became scarce, and continued to grow well and reproduce. As zooplankton decreased, YOY gamefish shifted their diets to aquatic insects. After the shift, the gamefish did not grow well. The continuous overgrazing of zooplankton by large numbers of threadfin shad had an impact on the growth of the juvenile largemouth bass and bluegills. This impact may result in weak year classes in the future.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectFishes -- Feeding and feeds -- Arizona -- Patagonia Lake.en_US
dc.subjectThreadfin shad.en_US
dc.subjectBluegill.en_US
dc.subjectLargemouth bass.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.contributor.advisorZiebell, Charles D.en_US
dc.identifier.proquest1333229en_US
dc.identifier.oclc20458309en_US
dc.identifier.bibrecord.b17012181en_US
dc.identifier.bibrecord.b1701217xen_US
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