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Kenya Project
PD/A CRSP Nineteenth Annual Administrative Report

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Research Projects
Kenya Project

Subcontract No. RD010A-13

Note: Additional project information on Networking, Educational Outreach, and Conferences appears in the Peru Project section, p. 51.

University of Arkansas at Pine Bluff, Arkansas

Rebecca Lochmann US Principal Investigator
Felicia BeardenAssistant
Jason Brown Undergraduate Student Assistant


The Continuation Plan 1996 addressed the use of feed and fertilization combinations as a way of intensifying production systems. The plan also identified research objectives geared at optimizing resource utilization based on factors at each site and development of practical guidelines for improving management of ponds. Ninth Work Plan research in this component of the Kenya Project examines tilapia utilization of different locally available feeds and feedstuffs by analyzing carbon and nitrogen isotope ratios.

Work Plan Research

The following Ninth Work Plan investigation continued into the current reporting period (see the Peru Project (p. 51) for information on another funded investigation under this subcontract):

Note: The schedule for 9FFR2A was modified. The revised schedule appears in the Addendum to the Ninth Work Plan. This investigation was a collaborative project among University of Arkansas at Pine Bluff (UAPB), Oregon State University (OSU; under MOU No. RD009A), and Auburn University (AU; under Subcontract No. RD010A-08). The following report submitted by UAPB addresses objective 2, the relative contribution of natural food. The 9FFR2 report submitted by OSU and AU addresses objective 1, locally available and lower-cost feeds (see p. 55).


Lochmann met with David Liti from Moi University in Kenya at the World Aquaculture Society meeting in Orlando, Florida, on 21 January 2001. They discussed the use of stable isotopes to trace food sources in aquaculture ponds.

Educational Outreach

Lochmann includes material from the CRSP project in her fish nutrition lectures, and students and faculty are interested in the use of stable isotopes as tracers in pond studies.

Lochmann has developed a set of overheads describing Sagana Fish Farm and how her research benefits the overall Kenya Project. She presents it to students in classes and to visitors who are specifically interested in aquaculture and fisheries. Colleagues also borrow them to display in group presentations, showcasing the departmental research by faculty at UAPB.

Fish Yields and Economic Benefits of Tilapia/Clarias Polyculture in Fertilized Ponds Receiving Commercial Feeds or Pelleted Agricultural By-Products

Ninth Work Plan, Feeds and Fertilizers Research 2A (9FFR2A)
Final Report

Rebecca Lochmann
Department of Aquaculture and Fisheries
University of Arkansas at Pine Bluff
Pine Bluff, Arkansas, USA


Stable carbon and nitrogen isotopes were used to obtain estimates of the contribution of natural and supplemental feeds to the nutrition of Oreochromis niloticus in ponds (free-swimming or caged) receiving different inputs in Sagana, Kenya. Three dietary treatments were employed in the pond study: 1) the test diet; 2) a pig finisher diet; and 3) a rice bran diet. Feeding rates and fertilization regimes are detailed in the report for 9FFR2. For isotope analysis, samples of Oreochromis (free-swimming and caged) and plankton were taken from ponds in Sagana three times (January, March, and May) during the study. The carbon and nitrogen isotope ratios of the diets were analyzed once. Modest fish growth during the study on all dietary treatments (the fish acquired 50% of their final weight between January and May) limited the application of the stable isotope technique for determining the relative assimilation of plankton and the different diets. The patterns of change in the d13C and d15N of free-swimming and caged Oreochromis and plankton over time and their possible interpretation were described within and between treatments.

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