Theses and Dissertations


Title: Dynamics of an exploited fish population in a pond with a sanctuary

Name: Hill, Thomas Kennard

Degree: PhD

Chair: Dr. E.W. Shell

Resides: FAA Library

University: Auburn

Location: Auburn, Alabama

Date: 1970

Pages: 91

Keywords: Dynamics,Exploited Fish Population,Sanctuary.

Abstract:

A 25.5 acre research pond at Auburn University was initially stocked with bluegill, redear sunfish, largemouth bass, black crappie, and fathead minnows, at rates of 750, 250, 100, 100 and 1,000 per acre, respectively. Grass carp were added later at 20 per acre for control of filamentous algae. Good fishing was maintained from 1967 through 1969 when a sanctuary for the fish was provided by allowing fishermen to utilize only one-half the shoreline. The presence of a sanctuary reduced the rate of removal of fish when fishing pressure and catch per acre were comparable to those of a similiar pond not having a sanctuary. The bass year classes of 1966 and 1967 were large, but in the following 2 years, bass reproduction attempts were unsuccessful. The crowded yearling bass in 1968 and crowded intermediate bluegill in 1969 were considered responsible for the lack of success. Average weights of bass and crappie in the catch increased progressively during the 3 years of fishing, but average weights of bluegill and redear decreased.A heavy infestation of the net algae Hydrodictyon in 1968 allowed forage fish to escape predation in similar fashion to that in a pond overgrown with aquatic weeds. Karmex temporarily controlled Hydrodictyon when applied at the rate of one pound per surface acre. Of the fish tagged with numbered spaghetti tags in the sanctuary, 39 per cent were caught by fishermen in the unrestricted area.

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