Degree Type

Thesis

Date of Award

2007

Degree Name

Master of Science

Department

Natural Resource Ecology and Management

First Advisor

Michael C. Quist

Abstract

Lakes are important resources and understanding relationships between fish, humans, and environmental conditions is critical for guiding management activities. We examined fish populations, limnological conditions, lake basin morphology, and watershed characteristics in 129 Iowa lakes. Our purpose was to evaluate patterns in population characteristics of important fish species in relation to environmental conditions. Bluegill Lepomis macrochirus and largemouth bass Micropterus salmoides abundance was highest in systems with high water transparency and nutrients. Catch rates of bluegill, black crappie, and largemouth bass were generally low when omnivores (e.g., black bullhead Ameiurus melas, common carp Cyprinus carpio) were present. Body condition of the study species was highest in highly productive lakes with clear water. Bluegill and largemouth bass condition and bluegill growth showed evidence of density dependence. This study suggests that high water transparency generally resulted in high relative abundance, good condition, and fast growth of sport fishes in Iowa's highly productive lakes.

DOI

https://doi.org/10.31274/rtd-180813-15827

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Zachary Joseph Jackson

Language

en

Proquest ID

AAI1447493

OCLC Number

213357671

ISBN

9780549334231

File Format

application/pdf

File Size

75 pages

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