Modeling of aquaculture pond dynamics.

Aquaculture pond models are reviewed. Empirical pond models can be used for the analysis of large pond datasets, whilel theoretical models are based on knowledge of the processes, underlying the system. Existing models deal with fish production in ponds, the foodweb and pond water quality. Most succesful models in terms of predictive ability and applicability in day-to-day management are models for dissolved oxygen and temperature. Fish growth models are constrained by difficulties in modeling food consumption and natural food quality.

A method for the analysis of pond growth experiments.

Pond growth experiments play an essential role in aquaculature research in assessing the growth potential of thevarious species and strains. A method is proposed for the analysis of pond growth experiments which should help in addition to facilitating analysis of aquaculature data to bridge the gap separating fishery biologists working with wild populations and aquaculturists working with confined populations.

Low input technologies for rural aquaculture development in Bangladesh

Fish is the main animal protein source for the people of Bangladesh. In spite of vast water resources, fish production is in decline, resulting in protein-energy malnutrition. Farmers participating in on-farm research developed low-input sustainable aquaculture practices that benefit the poor farmers, who constitute the bulk of the population. Farmer-oriented studies have confirmed the viability of culturing silver barb (Puntius gonionotus) and nile tilapia (Oreochromis niloticus) in seasonal ponds. Productions of 1,2052,156 kg of P.

Liming of fishponds in Malawi: a comparative study of limed and unlimed ponds.

Experiments are summarized on the use of firewood ash and agricultural lime, and the diagnosis of lime requirements in experimental fishponds situated on ferruginous and weathered soils lacking soluble bases insouthern Malawi. The nutrient status of soils on land available for pond construction at the National Aquaculture Centre, Zomba, Malawi was determined, based on their %C, %N, P, K super(+), Na super(+), Mg super(2+), Ca super(2+) contents and relating these to recommended levels for soil fertility in Malawi.

Investigations on the use of on-farm resources as pond inputs to culture Tilapia rendalli and Oreochromis shiranus on smallholder farms in rural Malawi.

Resources available on the majority of smallholder fish farms in the Zomba District of Malawi were tested toincrease smallholder aquaculture production currently limited by a lack of inputs.

Impact of improved aquaculture technologies: results of an extension program on the farming systems of Bangladesh.

The paper discusses the results of a new strategy for extension of improved fish culture practices within the existing farming systems of Bangladesh. Implemented in a few selected village units, the main objective of the extension program was to assist farmers to adopt fish culture in small waterbodies (ponds/ditches).

Growth performance of Oreochromis lidole, O. squamipinnis, O. shiranus and O. karongae, new candidate species for aquaculture in open waters and fishponds in Malawi.

There are several tilapia species (Fam. Cichlidae) indeginous to Lake Malawi whose growth potential is little known outside their natural environment. Past aquaculture research efforts in Malawi have concentrated on Oreochromis shiranus and Tilapia rendalli. The performance of both species in ponds is limited by a high reproductive capacity and slow growth.

Fishponds facilitate natural resources management on small-scale farms in tropical developing countries.

A redefinition of the objectives for aquaculture development in tropical developing countries is presented. The common rationale to justify aquaculture development is that of fish production per se as a stand-alone enterprise. Efforts to link fish culture with livestock production by small-scale resource-poor farmers have not worked well because technology packages were proposed which did not consider their perspectives and resources. An alternative view is presented here, in which all the natural resources that can be managed by the fanner are considered.

Field studies on prevention and biological control of the cyanobacterial blooms using Chlorella and Scenedesmus in the Nile tilapia farms

This study aimed to investigate the use of green algae Chlorella elliposoidea (Gerneck) + Scenedesmus bijuga (Turpin) Lageh as prevention and biological control treatment of cyanobacterial blooms as field application. Twelve earthen ponds were randomly assigned to three groups with four replicates per each treatment. The first group served as a control. The second group (1st treatment) was seeded with C. elliposoides + S. bijuga at initial density; 20 x 103 cells ml-1 (16 tons acre-1 live algae) at the beginning of production season in June 2005 (as prevention treatment).

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