In parallel with the increasing consumption of cultured fishery products, securing the food safety for marine products is becoming a social problem. Among them, shellfish can cause food poisoning due to pathogenic microorganisms. Especially, oysters are highly likely to accumulate pollutants in huma...
In parallel with the increasing consumption of cultured fishery products, securing the food safety for marine products is becoming a social problem. Among them, shellfish can cause food poisoning due to pathogenic microorganisms. Especially, oysters are highly likely to accumulate pollutants in human bodies through filter feeding. Goseong-man bay is a semiclosed back bay in a triangular shape with a narrow entrance and getting wider inwards. Due to bad flow of seawater, the bay is easily affected by direct and indirect pollutants in the drain basin area. As Goseong-man bay has many oyster farms, the change of total coliform and fecal coliform is important in terms of the food safety of their products oysters. While clarifying the cause affecting the change in total coliform and fecal coliform is needed in this situation, any research on the cause has not been conducted. The purpose of this study is to identify the change and cause of total coliform and fecal coliform in oyster farms in Goseong-man bay, and ultimately to provide data for the food safety of cultivated oysters at Goseong-man bay.
Seawater sampling was carried out at 10 stations in March, May, July, September, and November of 2016. In this study, pollutants loads calculation, physicochemical testing, and microbiological testing were conducted.
The total pollutant loads were estimated as following: 10,004 tons/year in BOD, 2,371 tons/year in T-N, and 714 tons/year in T-P.
Tidal current speed did not exceed 10cm per second within the survey period, the mean water temperature was 18.96±5.51℃, the mean salinity 31.70±1.34 psu, the mean pH 7.96±0.13, the mean DO 6.50±1.36 mg/L, and the range of mean COD was from 1.30±0.63 to 2.77±1.13 mg/L. Total coliform at <1.8-14 MPN/100mL, and fecal coliform at <1.8-7.8 MPN/100mL was founded in the microbiological test.
Physicochemical factors did not affect the variation of total coliform and fecal coliform. However, fecal coliform(7.8 MPN/100mL) at station 6 and 7 were found relatively high in marine microbes according to rain. The station 6 of the survey seems to be influenced by stream water at the time of rainfall, the station 7 by the pollutants flowed from stream water, domestic waste water, domestic animals, and the shopping complex built by a modernization project of the Nampo port. In addition, in the study of land pollution sources, the detection amount of microorganisms in streams and domestic waste waters flowing into the station 7 were as high as 220-1300 MPN/100mL and 79-170 MPN/100mL in each total coliform and fecal coliform.
Therefore, stations 6 and 7 located inside the bay, which seem to be much affected by rainfall, will need to take measures to reduce pollution for sustainable production of cultured fishery. It is also needed to prohibit eating raw oysters when in excess of standards, to designate Goseong-man bay as an specialized area for oyster farming in order to shift floating fish cage and manage marine manufactures, or minimize pollution in development of Nampo port for oyster farming.
In parallel with the increasing consumption of cultured fishery products, securing the food safety for marine products is becoming a social problem. Among them, shellfish can cause food poisoning due to pathogenic microorganisms. Especially, oysters are highly likely to accumulate pollutants in human bodies through filter feeding. Goseong-man bay is a semiclosed back bay in a triangular shape with a narrow entrance and getting wider inwards. Due to bad flow of seawater, the bay is easily affected by direct and indirect pollutants in the drain basin area. As Goseong-man bay has many oyster farms, the change of total coliform and fecal coliform is important in terms of the food safety of their products oysters. While clarifying the cause affecting the change in total coliform and fecal coliform is needed in this situation, any research on the cause has not been conducted. The purpose of this study is to identify the change and cause of total coliform and fecal coliform in oyster farms in Goseong-man bay, and ultimately to provide data for the food safety of cultivated oysters at Goseong-man bay.
Seawater sampling was carried out at 10 stations in March, May, July, September, and November of 2016. In this study, pollutants loads calculation, physicochemical testing, and microbiological testing were conducted.
The total pollutant loads were estimated as following: 10,004 tons/year in BOD, 2,371 tons/year in T-N, and 714 tons/year in T-P.
Tidal current speed did not exceed 10cm per second within the survey period, the mean water temperature was 18.96±5.51℃, the mean salinity 31.70±1.34 psu, the mean pH 7.96±0.13, the mean DO 6.50±1.36 mg/L, and the range of mean COD was from 1.30±0.63 to 2.77±1.13 mg/L. Total coliform at <1.8-14 MPN/100mL, and fecal coliform at <1.8-7.8 MPN/100mL was founded in the microbiological test.
Physicochemical factors did not affect the variation of total coliform and fecal coliform. However, fecal coliform(7.8 MPN/100mL) at station 6 and 7 were found relatively high in marine microbes according to rain. The station 6 of the survey seems to be influenced by stream water at the time of rainfall, the station 7 by the pollutants flowed from stream water, domestic waste water, domestic animals, and the shopping complex built by a modernization project of the Nampo port. In addition, in the study of land pollution sources, the detection amount of microorganisms in streams and domestic waste waters flowing into the station 7 were as high as 220-1300 MPN/100mL and 79-170 MPN/100mL in each total coliform and fecal coliform.
Therefore, stations 6 and 7 located inside the bay, which seem to be much affected by rainfall, will need to take measures to reduce pollution for sustainable production of cultured fishery. It is also needed to prohibit eating raw oysters when in excess of standards, to designate Goseong-man bay as an specialized area for oyster farming in order to shift floating fish cage and manage marine manufactures, or minimize pollution in development of Nampo port for oyster farming.
주제어
#Coliform Fecal coliform environment oyster farm
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