Theses and Dissertations

Title: The effect of the manipulation of hydrogen-ion concentration in water upon survival of bluegill sunfish (Lepomis macrochirus) Rafinesque and largemouth bass (Micropterus salmoides) Lacepede

Name: Calabrese, Anthony

Degree: MS

Chair: Dr. H. S. Swingle

Resides: FAA Library

University: Auburn

Location: Auburn, Alabama

Date: 1962

Pages: 73

Keywords: Bluegill,Lepomis macrochirus,Largemouth bass,Micropterus salmoides,pH,Hydrogen ion.


This project was initiated to determine whether or not the manipulation of the hydrogen-ion concentration of water could be used to eliminate unwanted sizes of bluegills (Lepomis macrochirus), while leaving unharmed largemouth bass (Micropterus salmoides) and the desirable sizes of bluegills. The chemicals used to change pH in the test solutions were hydrochloric acid, acetic acid, sodium hydroxide, and calcium hydroxide.Experiments were conducted in 15-gallon capacity aquaria in the Farm Ponds Laboratory at Auburn University using hydrochloric acid and calcium hydroxide in tap water and pond water and acetic acid and sodium hydroxide in tap water only. Bluegills and bass were used as the test fish. Experiments were conducted in the field, using pond water in 0.0015-acre plastic-lined pools. Hydrochloric acid and calcium hydroxide were the test chemicals in these experiments. Bluegills alone were used as the test fish treated with hydrochloric acid. Bluegills and bass were used both separately and in combination as the test fish treated with calcium hydroxide. In general, small bass were as susceptible or more susceptible as bluegills to rapid changes in pH. Large bass appeared to be less susceptible than the bluegills and small bass to rapid changes in pH, but more extensive experiments should be conducted with large bass before any conclusions can be drawn. In the acid range in aquaria, death of 50 per cent or more of the bass and bluegills occurred from pH 4.2 to 3.9 and 4.2 to 3.6 in tap water, respectively and at pH 3.7 in pond water. In plastic-lined pools filled with pond water, death of 50 per cent or more of the bluegills occurred at pH 4.1. In the alkaline range in aquaria, death of 50 per cent or more of the bass and bluegills occurred from pH 10.2 to 10.5 and at pH 10.9, respectively in tap water and at pH 10.3 and 10.8, respectively in pond water. Death of 50 per cent or more of the small bass, large bass, and bluegills occurred at pH 10.8, 11.0, and 10.9 in plastic-lined pools, respectively.

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