Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Growth of two mud shrimps (Upogebia major and Austinogebia wuhsienweni) settled in Boryeong and Hongseong tidal flat

보령과 홍성 갯벌에 착저한 쏙 2종(Upogebia major and Austinogebia wuhsienweni)의 성장

  • Song, Jae-Hee (Tidal Flat Research Center, West Sea Fisheries Research Institute) ;
  • Ahn, Hyun-Mi (Tidal Flat Research Center, West Sea Fisheries Research Institute) ;
  • Jeung, Hee-Do (Tidal Flat Research Center, West Sea Fisheries Research Institute) ;
  • Chung, Sang-Ok (Tidal Flat Research Center, West Sea Fisheries Research Institute) ;
  • Kang, Hee-Woong (Tidal Flat Research Center, West Sea Fisheries Research Institute)
  • 송재희 (국립수산과학원 서해수산연구소 갯벌연구센터) ;
  • 안현미 (국립수산과학원 서해수산연구소 갯벌연구센터) ;
  • 정희도 (국립수산과학원 서해수산연구소 갯벌연구센터) ;
  • 정상옥 (국립수산과학원 서해수산연구소 갯벌연구센터) ;
  • 강희웅 (국립수산과학원 서해수산연구소 갯벌연구센터)
  • Received : 2019.06.18
  • Accepted : 2019.06.18
  • Published : 2019.06.30
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Abstract

The purpose of this study was to investigate the initial growth, burrowing depth, and relative growth of mud shrimps (Upogebia major and Austinogebia wuhsienweni), living in damaged high density tidal flat shellfish farms form 2008 in the Western coast of Korea. By August, young mud shrimps (Upogebia major), which had settled down on the tidal flats in early May, grew to more than 10 mm in carapace length (CL). At the end of the first year, their CL and total length (TL) increased to 14.21 mm and 42.28 mm, respectively. The inhabiting depth of the young mud shrimps (Upogebia major) increased rapidly up to about 6 months after stocking (5 cm in July, 12.5 cm in September, and 28 cm in November, respectively). The inhabiting depth of adult mud shrimps in their burrows was about 10-93 cm during the year. As results, the analysis of the relative growth between the carapace length (CL) - the total length (TL) and the CL - total wet weight (TWW), the total wet weight of mud shrimps at Boryeong Saho (inner part of the Cheonsu-bay) was estimated to be 1.2-4 g heavier than those of Boryeong Jugyo (Outer part of the Cheonsu-bay) tidal flat. The young mud shrimps primarily grew from April to October. It is therefore crucial to observe whether the settlement of young mud shrimps on tidal shellfish farms from May to June to minimize the damage of shellfish farms by newly stocked young mud shrimps. In addition, it is recommended that young mud shrimps grown in fisheries be harvested before they dig deep into the sediment until early December.

본 연구에서는 쏙류의 고밀도 서식 때문에 2008년 이후 피해가 급격히 증가하고 있는 한국 서해안 갯벌의 패류양식장에서 착저 초기에 쏙과 가시이마쏙의 초기 성장, 서식 깊이, 상대성장 특성을 구명하여 물리적 제거 또는 포획에 관한 기초적 생태자료를 확보하고자 하였다. 5월 초순에 갯벌에 착저한 어린 쏙은 8월 이후에 두흉갑장이 10 mm 이상으로 성장하였고, 갯벌에 착저 후 1년 경과 시 두흉갑장(CL)과 전장(TL)이 각각 14.21 mm, 42.28 mm까지 성장하였으며, 주 성장 시기는 4~10월이었다. 당년산 어린 쏙의 서식 깊이는 성장과 더불어 착저 후 약 6개월 경과시까지 빠르게 증가하였다(7월 5 cm, 9월 12.5 cm, 11월 28 cm). 어미 쏙(평균 두흉갑장 28.50 mm)의 연중 서식 깊이는 10~93 cm이었다. 쏙의 두흉갑장(CL)-전장(TL), 두흉갑장-습전중량(TWW) 간 상대성장을 분석한 결과, 두흉갑장 26~35 mm 크기에서는 쏙의 습중량이 천수만 입구의 주교 갯벌에 비해 천수만 내측의 사호리 갯벌에서 1.2~4 g 더 무거운 것으로 예측되었다. 본 연구에서 밝혀진 당년산 어린 쏙의 착저 후 초기 성장과 서식 깊이의 증가 특성으로 볼 때, 어린 쏙이 바지락 양식장 등에 정착하여 피해를 주는 것을 줄이기 위해서는 5~6월경에 쏙의 착저 여부를 주의해서 관찰해야 하며, 다량의 쏙 서식이 확인되면 갯벌 속에 30 cm 보다 얕게 굴을 파고 서식하는 8월부터 12월 사이에 어린 쏙을 제거하기 위한 다양한 노력을 기울일 필요가 있을 것으로 판단된다. 또한 보령지역 어미 쏙의 시기별 평균 서식 깊이 면에서 볼 때 1차 제거 적기는 쏙들이 표층에 가장 가까워지는 3월부터 5월 초순, 2차 적기는 10월 중순부터 12월 초순으로 판단된다. 쏙은 갯벌양식장에서 공간점유와 먹이 경쟁 등 인간의 경제활동에는 부정적인 영향을 주지만, engineering species로서 갯벌에 수많은 구멍을 깊게 뚫어줌으로써 다양한 생태계적 순기능도 수행하고 있으므로 친환경적이며 합리적인 대응 방안을 지속적으로 모색할 필요성이 있을 것으로 판단된다.

Keywords

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