The Korean Journal of Malacology (한국패류학회지)

The Malacological Society of Korea (한국패류학회)
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A Study on Survival and Growth of Ark shell, Scapharca broughtonii with differential density during hanging culture

  • Received : 2014.03.04
  • Accepted : 2014.03.25
  • Published : 2014.03.31
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Abstract

Ark shell Scapharca broughtonii length and total weight growth by density, which was hanging-cultured near the sea area of Yeosu-city, Hoenggan-island (below is Yeosu), showed inverse correlation with density. As for the average growth of shell length by density, the test area of 10 shells showed the best result as 5.21 mm, and it became lower as density became higher. Also, the increase of total weight by density showed the same result, thus on the whole, the increase of average shell length and total weight of 10-20 shell test area showed the better result than the test area of 30-40 shells. In addition, even if the parashell's shell length by density and total weight growth in the sea area of Namhae-gun, Mijo-fishing port (below is Namhae) showed inverse correlation with density, it showed the slighter inverse correlation than the sea area of Yeosu. As for the average growth of shell length by density, the test area of 10 shells showed the best result as 4.55mm, but the average growth of shell length by density in the test area of 20-40 shells appeared to be similar as 3.11, 3.36 and 3.27 mm. On the other hand, as for the increase of total weight by density, the test area of 10-20 shells showed the more increase than the test area of 30-40 shells. In conclusion, it is guessed that the culture density of 20 shells/$0.12m^2$ (166 shells / $1m^2$) would be appropriate when hanging-culturing the shells. At the sea area of A, the survival rate of Scapharca broughtonii parashell was 68-87% by density respectively, and it showed the density-dependent result, while the survival rate of sea area of Namhae, where phytoplankton as prey is abundant, showed the much better result as 91-100%. It is guessed that this may be due to the fact that the quantity of phytoplankton in sea area of Yeosu is just 55.89% of sea area of Namhae. When hanging-culturing the shells, the water temperature by sea area ranged from 16.22 to $25.66^{\circ}C$, salinity 30.07-33.48, pH 8.10-8.45, and DO 4.49-9.65 mg/L.

여수 횡간도 지역에서 밀도별 피조개 각장 과 전중량의 성장은 밀도와 역 상관관계를 보였다. 밀도별 각장 평균성장은 10마리구가 5.21 mm로 가장 양호하였으며 밀도가 높을수록 각장 성장은 낮아졌다. 밀도별 전중량의 증가도 같은 결과를 보여 전반적으로 10-20마리구의 평균각장 및 평균 전중량의 증가가 30-40마리구에 비하여 양호하게 나타났다. 남해해역에서 밀도별 피조개 각장과 전중량의 성장도 밀도와 역 상관관계를 보였으나 여수해역보다 약한 역 상관관계를 보였다. 밀도별 각장 평균성장은 10마리구가 4.55 mm로 가장 양호한 결과를 보였으나, 20-40마리구의 밀도별 평균각장의 성장은 3.11, 3.36, 3.27 mm로 비슷하게 나타났다. 반면에 밀도별 전중량의 증가는 10-20마리구가 30-40마리구보다 많았다. 결론적으로 피조개의 수하양성시 양성밀도는 20마리/$0.12m^2$ (166마리/$1m^2$) 가 적당하다고 사료되었다. 여수해역에서 피조개의 생존율은 밀도별로 각각 68%-87%, 로 밀도의존적 결과를 보였으나, 먹이생물인 식물플랑크톤이 풍부한 남해해역의 생존율은 91%-100%로 월등히 양호한 결과를 보였는데, 이는 여수해역의 식물플랑크톤의 양이 남해해역의 55.89%에 불과하였기 때문이라 사료된다. 수하 양성 해역별의 수온범위는 $16.22-25.66^{\circ}C$였고, 염분은 30.07-33.48였으며, pH는 8.10-8.45범위였다. 그리고 용존산소 (DO) 는 4.49-9.65 mg/L 였다.

Keywords

References

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