Weed control by adult and juvenile tilapia Tilapia rendalli in rainfed ponds.

Two studies were conducted in consecutive years over the time period 14 January to 1 July to determine whether labor-savings and fish growth enhancement could be achieved by stocking Tilapia rendalli directly into ponds containing weeds left from a dry period. Six replicates 200 m super(2) ponds located at the Malawi National Aquaculture Centre, Domasi were drained, left dry for 63 days and natural growth of weeds was allowed. All ponds were stocked with 200 T. rendalli fingerlings (study 1) or adults (study 2) averaging 4.6 g (40 mm TL) and 47.7 (130 mm TL), respectively. For T.

Water quality in integrated livestock-fish ponds.

Water quality variables were monitored during 3.5 years of research on pig-fish, duck-fish and chicken-fish systems. Early morning dissolved oxygen levels were often below 0.5 mg/1. Total ammonia levels were highest in chicken-fish systems with maximum levels exceeding 6 mg1. Water quality sampling designs which measure the fluctuations in water quality variables are discussed. Species selection, control of manure loads, addition of new water, and aeration are presented as means to manage water quality in livestock-fish systems.

Ten-year simulations of organic matter concentrations in tropical aquaculture ponds using the multiple pool modeling approach.

The accumulation rate of organic matter has been used to develop guidelines on sediment management in tropical aquaculture ponds. However, there is conflicting evidence as to the rate of sediment organic matter accumulation and whether steady state concentrations are achieved in the short term (10 years) in aquaculture ponds. A simulation study using the multiple pool modeling approach (Multi-G model) was conducted to determine the longterm dynamics of sediment organic matter and to establish whether steady state concentrations could be achieved in tropical aquaculture ponds.

Technical efficiency of tilapia growout pond operations in the Philippines.

The determination of efficient production levels for tilapia growout operations, given the existing technology, is necessary to examine alternative options to increase productivity. If farmers are not making efficient use of existing technologies, improving their efficiency is usually more costeffective than introducing new technology. This paper examines the technical efficiency of tilapia growout operations in ponds in the Philippines. A stochastic production frontier with technical inefficiency effects model is specified and estimated.

Status of fisheries resource and management approach in the open beels of Bangladesh: a comparative case study

A fish catch monitoring program was introduced in Ashura beel, Goakhola beel and Dikshi beel in 1997 through the Community Based Fisheries Management (CBFM) project. The project focused on developing community management approaches which would encourage participation of the fishers, beneficiaries and community in sustainable management of the fishery resources.

Seasonality, labor and integration of aquaculture into southern African smallhold farming systems

Fish production on Malawian smallholdings is generally limited by the quantity and quality of inputs to the pond (Brummett and Noble 1995). The timing of labor availability and other farm activities limit the amount farmers put into their ponds resulting in lower growth rates and yields. There is potential for improving production and yields through modifications of production schedules to accommodate other farming activities.

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