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Petersen E.H.,University of Stirling | Petersen E.H.,Advanced Choice Economics Pty Ltd | My Chinh D.T.,Research Institute for Aquaculture Number 1 | Diu N.T.,Research Institute for Aquaculture Number 1 | And 6 more authors.
Reviews in Fisheries Science | Year: 2013

This article presents technical and bioeconomic information on culture-based grow-out production of groupers in Vietnam. Grouper farming has good future potential as a viable alternative livelihood for fishers. It is found to be very profitable for cage farmers in northern Vietnam and marginally profitable for cage and pond farmers in central Vietnam. Productivity and total revenue are highest in the north, reflecting relatively high stocking rates, aquaculture area, and harvest prices. Cost per unit production is highest for centrally located cage farmers. The dominant cost sources for these farms are feed (40-60% of total costs) and, to a lesser extent, seed (20%) and labor (12-19%). The feed conversion ratios for these systems, where grouper are fed exclusively low-value finfish, is calculated to be 9 in the north and 12 in the center. It seems that improving the livelihood of grouper farmers in Vietnam is dependent on reducing their dependence on wild stocks for seed and feed, and increasing area and growout time for central farmers. If pellets are to be widely adopted by grouper farmers, perceptions regarding the poor adaptability, relatively slow growth rates compared with low-value finfish, and poor availability of pellets need to be overcome. © 2013 Copyright Taylor and Francis Group, LLC.

Petersen E.H.,University of Western Australia | Petersen E.H.,Advanced Choice Economics Pty. Ltd. | Luan T.D.,Research Institute for Aquaculture Number 1 | Chinh D.T.M.,Research Institute for Aquaculture Number 1 | And 4 more authors.
Aquaculture Economics and Management | Year: 2014

This article presents an analysis of the profitability and intensity of cobia culture by small-scale farmers in Vietnam, especially focusing on current feeding practices and perceptions regarding adoption of manufactured diets. Bioeconomic modelling is used so the interactions between biological and economic processes can be analyzed. Overall, it is found that cobia farming is moderately to highly profitable when compared to other aquaculture species in Vietnam. Culture practices and the level of intensity of cobia farming differ significantly across Vietnam. Initial stocking density, total number of fish stocked, number and size of cages, and quantity of feed used are all higher in southern Vietnam than the north. The higher level of intensification in the south leads to significantly higher total costs, productivity and profitability. The dominant cost source is feed, which is predominantly low-value fish. To capture the environmental and potential economic benefits of adopting pelleted diets, then negative farmer perceptions regarding relatively slow growth rates, and lack of availability compared with low-value fish need to be overcome. © 2014 Copyright Taylor and Francis Group, LLC.

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