Theses and Dissertations


Title: Some aspects of the biology of the redfin pickerel, Esox americanus americanus Gmelin, in ponds

Name: Addison, Joseph Henry

Degree: MS

Chair: Dr. E. W. Shell

Resides: FAA Library

University: Auburn

Location: Auburn, Alabama

Date: 1971

Pages: 71

Keywords: Redfin Pickerel,Esox americanus americanus Gmelin.

Abstract:

Experiments were conducted during 1966 to obtain information on some aspects of the biology of the redfin pickerel. A spawning experiment was conducted with adult pickerel in an earthen pond. Fingerlings were discovered when the water temperature was 61oF. The pickerel was evaluated as a predator when stocked at 100 per acre in combination with the bluegill, Lepomis macrochirus Raf. (1,000 per acre), and the fathead minnow, Pimephales promelas Raf. (1,000 per acre). Pickerel were stocked at 200 per acre in combination with the blue tilapia, Tilapia aurea Steindachner (1000 per acre), and the Congo tilapia, T. melanopleura DumÄril (2000 per acre). Pickerel failed to effectively control the forage fish populations in either the bluegill or tilapia ponds. The sex ratio of pickerel did not deviate significantly from an expected 1:1 ratio. No difference was found in the number of mature eggs per gram of ovary between the anterior, median, and posterior sections. There was a highly significant difference in the number of mature eggs between females. Equations for the length-weight relationship for pickerel were calculated. There was a significant difference between regression coefficients between sexes. Females were considerably larger than males. The length-mouth width relationship for pickerel was calculated. There was no significant difference between regression coefficients for sexes. Females had the largest mouth width for the same length fish. The length-body depth relationship for pickerel was calculated. An analysis of covariance between sexes indicated the regression coefficients were significantly different.

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