The Korean Journal of Malacology (한국패류학회지)

The Malacological Society of Korea (한국패류학회)
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Improvement of Manila Clam (Ruditapes philippinarum) Habitat Condition by Adding Crushed Oyster (Crassostrea gigas) Shells to the Substratum

굴 패각을 이용한 바지락 양식장 저질개선 효과

  • 박광재 (국립수산과학원 갯벌연구소) ;
  • 윤상필 (국립수산과학원 갯벌연구소) ;
  • 송재희 (국립수산과학원 갯벌연구소) ;
  • 한현섭 (국립수산과학원 서해수산연구소) ;
  • 오해종 (국립수산과학원 서해수산연구소)
  • Received : 2011.09.28
  • Accepted : 2011.12.21
  • Published : 2011.12.31
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Abstract

In an attempt to improve the substrate condition for Manila clam (Ruditapes philippinarum) culture, crushed oyster (Crassostrea gigas) shells were spread on the muddy tidal flat of Namseong-ri, Podu-myeon, Goheung-gun, Jeollannam-do in April 2008. To test the suitability of the crushed oyster shell added substrate, seed clams were transplanted from Taehwa river estuary in Ulsan city in June 2008. Over 23 months of sampling, the mean grain size and the sorting in the experimental site containing the crushed oyster shell were significantly higher than the control site. The ignition loss, water content, chemical oxygen demand (COD) and acid-volatile sulfide (AVS) level were also significantly higher in the crushed oyste shell added substratum. Survival of the clams transplanted to the crushed oyster shell added substratum was significantly higher and all the clams transplanted to the normal muddy substratum died in August 2009, 13 months after the transplantation. At the end of the experiment in April 2010, the transplanted clams reached 36.10 mm in shell length and 8.92 g in total weight with survival of 43.5%. Our study suggested than crushed oyster shell added in the mud dominant substratum greatly improved living condition and survivability of clams.

2008년 4월에 전남 고흥군 포두면 남성리 지선에서 바지락이 서식하기 어려운 니질의 양식장에 폐기물로 처리되는 굴 패각을 분쇄하여 넣어준 후, 2008년 6월에 울산 태화강에서 채취한 바지락 종패를 씨뿌림하여 양식 가능성 여부를 조사하였다. 조사해역 저질의 입도분석에서 굴 패각을 넣어준 시험구에서 대조구에 비하여 평균 입도와 평균 분급도는 증가한 것으로 나타났다. 또한 퇴적물에서도 산휘발성황화물 (AVS), 화학적 산소요구량 (COD), 강열감량 (IL), 함수율이 굴 패각 시험구에서 증가한 것으로 나타났다. 굴 패각을 이용한 바지락 양식장 저질개선 후, 2008년 6월에 평균 각장 21.00 mm, 전중량 1.86 g을 씨뿌림하였다. 23개월이 경과한 2010년 4월에 굴 패각 시험구에서는 각장 36.10 mm, 전중량 8.92 g으로 성장하였으며, 최종 생존율은 43.5%로 나타났다. 그러나 굴 패각을 넣지 않은 대조구에서는 13개월이 경과한 2009년 7월에 각장 32.62 mm, 전중량 7.34 g으로 성장은 빠르게 나타났으나, 모두 폐사하는 결과를 나타냈다.

Keywords

References

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