Theses and Dissertations


Title: Cage culture of the cichlid fish Tilapia aurea (Steindachner)

Name: Pagan, Francisco Alfredo

Degree: PhD

Chair: Dr. E.W. Shell

Resides: FAA Library

University: Auburn

Location: Auburn, Alabama

Date: 1970

Pages: 109

Keywords: Cage Culture,Cichlid Fish,Tilapia aurea (Steindachner).

Abstract:

A 2-year study to evaluate the potential and determine the feasibility of raising Tilapia aurea (Steindachner) with feeding in suspended cages in ponds was conducted at the Fisheries Research Division, Auburn University, Agricultural Experiment Station, Auburn, Alabama. In 1968, a preliminary experiment was conducted in 0.0018-acre plastic pools using circular cages. During 1969, an experiment was conducted in 0.1-acre earthen ponds using square cages. Pond and cage culture experiments were done simultaneously for comparative evaluations. A maximum net production per cage of 212.3 pounds was obtained with 600 fish having a feed conversion of 1.8. The best conversion in cages, 1.2, was obtained with 200 fish per cage. These fish also had the fastest growth rate, and in a 156-day period they grew from an average weight of 0.03 to 0.56 pound: the highest average weight among all fish in cages and fish grown free in ponds. The highest net production for the entire study, 436.3 pounds per 0.1-acre pond, was produced with a combination of 300 cage fish and 300 adult pond fish plus 17,411 offspring. These fish gave a feed conversion of 0.9 and attained a final mean weight per adult fish of 0.51 pound. Mortalities occurred in four of 12 cages due to two main factors: (1) low dissolved oxygen and (2) a bacterial disease. Difference between survival of cage and pond Tilapia aurea was not significant. In 1969, an experiment in plastic pools was conducted testing cage culture as a method to prevent reproduction of this species. Cage Tilapia aurea did not reproduce whereas those free in ponds produced between 99,350 and 197,550 fry per acre.

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