Mixed sexes of Oreochromis shiranus and Tilapia rendalli were stocked in 5-m super(3) concrete tanks in the ratios of 0:100, 25:75, 100:0 and 75:25, at the rate of 6 fish m super(-2). O shiranus and T. rendalli were stocked at mean body weights ( not equal to SD) of 12 not equal to 0.4 g and 12 not equal to 0.7 g, respectively. Cabbage and pumpkin leaves were added to the tanks at a rate chosen to simulate pond conditions (50 kg dry matter (DM) ha super(-1) day super(-1)) as bundles tied with wire, fully submerged at a depth of about 30 cm.
Three low cost aquaculture technologies such as polyculture of carps and monoculture of Nile tilapia and monoculture of silver barb were developed and introduced to the farmers based on their socioeconomic conditions and pond attributes. Their common feature is reliance on on-farm resources, through integrating aquaculture into the existing farming systems. Among the socioeconomic factors affecting farmers' adoption of these technologies, training was the key variable.
This paper evaluates resource allocation efficiency of prawn-carp polyculture systems by making use of the data of 105 farmers of Bangladesh. Data Envelopment Analysis (DEA) was employed to estimate the efficiency. Mean technical efficiency (TE), allocative efficiency (AE) and cost efficiency (CE) were 85%, 58%, and 49%, respectively. Fifty percent of prawn-carp farmers displayed full TE whereas only 9%were cost efficient. Actual input application largely deviated from the technical and cost-efficient levels.
Shire tilapia, Oreochromis shiranus shiranus (Boulenger 1897), was grown in monoculture and polyculture with either straightfin barb, Barbus paludinosus (Peters 1852), or threespot barb, Barhus trimaculatus (Peters 1852), (collectively known as matemba) under conditions which simulated smallholder farming conditions in Southern Malawi. Over 150 days, B. paludinosus-O. shiranus shiranus polyculture was significantly (P < 0.05) more productive than either O. shiranus shiranus or B. paludinosus monoculture. Over 107 days. B. trimaculatus-O.
The objectives of this study were to determine whether species interaction be-tween the Nile tilapia and the red claw crayfish in polyculture would be synergis tic or antagonistic in terms of growth rate and total production, and to assess the impact of red claw crayfish on tilapia reproduction in ponds.
A study was undertaken to determine fish species combinations that would result in optimum production levels in integrated broiler raising systems. Its objectives were: (i) to evaluate the production potential of fish in integrated poultry-fish systems using high yielding varieties of broilers; (ii) to identify which fish species combination would result in optimum production levels; (iii) to estimate the effects of varying ratios of Catla catla and Hypophthalmichthys molitrix in stocking on gross production; (iv) to assess the production potential of O.
The integration of paddy cultivation with prawn/fish culture can become a viable alternative to effectively utilize the vast area of derelict polders (embanked coastal flood plains) in Kuttanad, India. Nearly 55 000 ha of wetlands in Kuttanad are available for paddy cultivation year-round. Around 5 000 ha of the polders are utilized for Macrobrachium rosenbergii culture as a follow-up crop. Of the total area, about 250 ha of fallow polders are utilized for monoculture of M.
The effects of fertilizer types and stocking density were investigated on water quality parameters that expected to affect growth performance of the polyculture of Nile tilapia <i> (Oreochromis niloticus) </i>, African catfish <i> (Claris gariepinus) </i> and sliver carp <i>(hypophthalmichthys molitrix)</i>. The purpose of this study was to determine the best type of fertilizer to use and stocking density to apply which maximizing fish yields while minimizing expenses and environmental degradation.
One of the unique features of the Development of Sustainable Aquaculture Project of the WorldFish Center, Bangladesh, was the provision of 3 y of continuous training and extension in support of the fish farmers involved. It was expected that the long-term support would make a significant contribution to boosting production and incomes as well as sustainability. The article demonstrates the impact of the training and extension support to small-scale carp polyculture farmers in terms of productivity, profitability, and efficiency.
The growth and production performances of Genetically Improved Farmed Tilapia strain, known as GIFT, was evaluated along with two locally available tilapia breeds, domesticated as existing Nile and red tilapia strains, and with several carp species under polyculture system in ponds and subsequently in cages under on-station and on-farm conditions in Bangladesh.