Theses and Dissertations


Title: The effects of ground dolomitic limestone on fish production and plankton production in ponds

Name: Lawrence, John Medlock

Degree: MS

Chair: Dr. H.S. Swingle

Resides: FAA Library

University: Auburn

Location: Auburn, Alabama

Date: 1943

Pages: 40

Keywords: Ground Dolomitic Limestone,Plankton Production.

Abstract:

A study was conducted in six one-fourth acre ponds to determine if the application of large amounts of limestone to a pond would increase the plankton production and fish production in ponds. Two of the ponds received no lime, two received ground dolomitic limestone at the rate of 1000 pounds per acre and two at the rate of 2000 pounds per acre. All of the ponds received applications of an inorganic fertilizer mixture every three or four weeks to maintain a good growth of plankton. The calcium concentration in the waters of the limed ponds was greater than in the unlimed ponds, but it was never greater than 19 p.p.m. The same was true for the calcium concentation in the pond bottoms. The nitrogen, phosphorus, oxygen, carbon dioxide, carbonates, bicarbonates, carbon dioxide tension and hydrogen ion concentrations were practically the same for the limed and unlimed ponds. The unlimed ponds averaged the highest plankton production for the entire experiment. One of the ponds, limed at the rate of 1000 pounds per acre, which had received organic fertilizer the previous year, produced a high yield of plankton in the early spring but this dropped in the late spring when all of this reserve food supply had been used up.The average fish production per acre was 416.7 pounds in the unlimed ponds., 415.6 pounds in the ponds limed at the rate of 1000 pounds per acre, and 332.4 pounds in the ponds limed at the rate of 2000 pounds per acre. One of the unlimed ponds, F-3, produced the highest yield of fish (540.5 pounds per acre) 59 per cent of which was minnows. One of the ponds limed at the rate of 1000 pounds per acre produced the next highest yield (516.25 pounds per acre). This high production was apparently the result of the pond receiving organic fertilizer (soybean meal) the previous year which built up a residual food supply available for use by the plankton in the early spring. The amount of limestone applied to these ponds gave no increase in the plankton production or fish production.

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