• Journal of Marine Life Science
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• v.1 no.2
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• pp.117-120
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• 2016

The success or failure of aquaculture heavily depends on how effectively to manage aquatic animal diseases. The paper is to estimate the direct effects of economic benefits on aquatic animal disease prevention program using economic surplus analysis. The economic benefits include changes in consumer and producer surplus owing to a reduction effect of aquatic animal mortality and the consumption recovery effect. The annual changes in producer surplus for flounder, rockfish and others cultured is estimated as 2.33 billion won totally (0.87 billion won, 1.01 billion won and 0.45 billion won respectively) and the annual changes in consumer surplus 10.15 billion won totally (6.36 billion won, 1.85 billion won and 1.94 billion won respectively). Therefore, total annual economic benefit is 12.5 billion won.

• The Korean Journal of Malacology
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• v.28 no.1
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• pp.45-54
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• 2012

We investigated environmental characteristics of the tidal flat oyster aquafarms to clarifyeffects of the tidal flat environmental factors on growth and mortality of the tidal flat oyster Crassostrea gigas by the Net Bag Rack Culture System in two districts in Western Korea. In this study, we have carried out the basic environmental investigation on growth of the single tidal flat, water quality and sediments, etc. in Taean and Seosan districts, Choongcheongnam-do, where the single tidal flat oyster aquaculture have been performed by the net bag rack culture system. In June 2011 when the final survey carried out at the two districts in western Korea, the mortality in Seosan district was higher than that in Tae-an district. Judging from the results of growth and mortality of the single tidal flat oysters investigated at two sites of Jinsan-ri in Taean and Chang-ri in Seosan districts, two results of Taean district showed higher growth and lower mortality than those of Seosan district. It is assumed that the proper acceptable density possible for growth of the tidal flat seeds and the secure of economics, in case of plastic cultivate net with the size of $50{\times}80cm$, are about 200 individuals. In this study, It was clarified that selection of the suitable sites, the input into the net bag of high quality oyster seeds and selective dispersion in the optimal density of the single tidal flat oyster have an effect on growth and mortality of the tidal flat oyster.