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9NS4-SemiIntensive Culture of Tilapia in Brackishwater Ponds
PD/A CRSP Eighteenth Annual Technical Report
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Cite as: [Author(s), 2001. Title.] In: A. Gupta, K. McElwee, D. Burke, J. Burright, X. Cummings, and H. Egna (Editors), Eighteenth Annual Technical Report. Pond Dynamics/Aquaculture CRSP, Oregon State University, Corvallis, Oregon, [pp. ___.]

SemiIntensive Culture of Tilapia in Brackishwater Ponds

Ninth Work Plan, New Aquaculture Systems/New Species Research 4 (9NS4)
Abstract

C. Kwei Lin and Yang Yi
Aquaculture and Aquatic Resources Management Program
Asian Institute of Technology
Pathumthani, Thailand

James S. Diana
School of Natural Resources and Environment
The University of Michigan
Ann Arbor, Michigan, USA

Abstract

This experiment was started in June and will be terminated in November 2000. The purposes of the experiment were to: 1) determine appropriate fertilization regimes in brackishwater ponds; 2) investigate nutritional value and digestibility of specific marine phytoplankton as food organisms to tilapia; and 3) exploit underutilized or abandoned shrimp ponds for tilapia production. Two fertilization regimes (28 kg N and 7 kg P ha-1 wk-1 and 28 kg N and 14 kg P ha-1 wk-1) and three levels of salinity (10, 20, and 30) were tested by a 2 X 3 factorial design. Eighteen cement ponds (6 m2) were filled with 15 cm of soil and then flooded with water of differing salinities by diluting hypersaline water to the appropriate concentrations. Thai red tilapia fingerlings were stocked at 2 fish m-2. All ponds were fertilized weekly at the two rates using urea and triple superphosphate (TSP). Water levels will be maintained at 0.8 m depth, and salinity levels will be checked and adjusted weekly. Plankton composition will be assessed biweekly. Partial budgets will be calculated to estimate cost of inputs and value of fishcrop.

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