Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Effect of Salinity on Survival and Growth of 3 Gobiidae

염분변화가 망둑어과 어류 3종의 생존 및 성장에 미치는 영향

  • Hwang, Un-Gi (National Fisheries Research & Development Institute, West Sea Fisheries Research Institute, Marine Ecological Risk Assessment Center) ;
  • Min, Eun-Yong (Department of Aquatic Life Medicine, Pukyong National University) ;
  • Kang, Ju-Chan (Department of Aquatic Life Medicine, Pukyong National University)
  • 황운기 (국립수산과학원 서해수산연구소 해양생태위해평가센터) ;
  • 민은영 (부경대학교 수산생명의학과) ;
  • 강주찬 (부경대학교 수산생명의학과)
  • Received : 2012.01.19
  • Accepted : 2012.02.15
  • Published : 2012.03.01
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Abstract

The gobiidae, $Tridentiger$ $trigonocephalus$, $Chasmichtthys$ $dolichognathus$ and $Favonigobius$ $gymnauchen$ were reared for 4 weeks under 0~33.6‰ salinity conditions to examine the effects of various salinity on its survival and growth. Survival rate of $C.$ $dolichognathus$ and $F.$ $gymnauchen$ were significantly declined below 3.4‰ and 0‰, respectively. Growth rate of $T.$ $trigonocephalus$ was significantly reduced 0‰ salinity. Growth rate of $C.$ $dolichognathus$ and $F.$ $gymnauchen$ exposed to ${\geq}$13.4‰ and ${\geq}$6.7‰ were significantly higher than those of gobiidae exposed to below ${\leq}$10.1‰ and ${\leq}$3.4‰ salinity, respectively. This study reveled that low salinity (${\leq}$3.4‰) reduced survival and growth rates of the 3 gobiidae suggesting potential influence on the natural mortality of gobiidae in the coastal areas.

넓은 범위의 염분에 대한 망둑어 3종의 적응성을 파악하기 위하여 이들의 생존 및 성장에 대한 염분농도의 영향을 검토하였다. 두줄망둑은 0~33.6‰의 염분범위에서 유의한 생존율 차이가 없었고, 점망둑의 생존율은 염분농도 13.4‰ 이상에서 90% 이상을 나타내었으며, 3.4‰ 이하에서는 80% 이하로 유의하게 감소하였다. 또한, 날개망둑의 생존율은 염분농도 3.4‰ 이상에서 90% 이상을 나타내었으나, 담수에서는 87.5%로 유의한 감소가 관찰되었다. 두줄망둑은 염분농도 13.4 및 20.2‰에서 가장 높은 일일성장률은 나타냈고, 담수에서 유의한 감소가 관찰되었다. 점망둑의 일일성장률은 염분농도 20.2~33.6‰ 이상에서 가장 높았고, 10.1‰ 이하에서 가장 낮아 이들 사이의 유의한 차이를 나타냈다. 날개망둑의 일일성장률은 염분농도 10.1~27.4‰에서 가장 높았으나, 담수에서 유의한 감소가 나타났다. 이상의 결과는 3종의 망둑어, 특히 점망둑은 낮은 염분에 노출되었을 때, 그들의 생존 및 성장에 영향을 받는다는 것을 의미하고 있어 이들의 분포 및 개체수에 잠재적인 영향을 받을 수 있을 것으로 예상된다.

Keywords

References

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