염분변화가 망둑어과 어류 3종의 생존 및 성장에 미치는 영향
Effect of Salinity on Survival and Growth of 3 Gobiidae
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넓은 범위의 염분에 대한 망둑어 3종의 적응성을 파악하기 위하여 이들의 생존 및 성장에 대한 염분농도의영향을 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% 이상을나타내었으나, 담수에서는 87.5%로 유의한 감소가 관찰되었다. 두줄망둑은 염분농도 13.4 및 20.2‰에서 가장높은 일일성장률은 나타냈고, 담수에서 유의한 감소가관찰되었다. 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, 그들의생존 및 성장에 영향을 받는다는 것을 의미하고 있어이들의 분포 및 개체수에 잠재적인 영향을 받을 수 있을 것으로 예상된다.
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 ›13.4‰ and ›6.7‰ were significantly higher than those of gobiidae exposed to below ‹10.1‰ and ‹3.4‰ salinity, respectively. This study reveled that low salinity (‹3.4‰) reduced survival and growth rates of the 3 gobiidae suggesting potential influence on the natural mortality of gobiidae in the coastal areas.
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