원문정보
초록
영어
This study conducted the expression level of endocrine hormones in terms of days after hatchling and increasing salinity level. As salinity level is increased, expression of Growth Hormone Receptor(GHR) was relatively increased while Prolactin Receptor(PLR) and Insulin-Like Growth Factor-1 Receptor(IGR) are decreased gradually. Expression of Thyroid Stimulating Hormone Receptor(THR) was relatively lower and decreasing gradient of IGR was relatively higher in fast increase of salinity than slow increase of salinity. Expression level of Glucocorticoid Receptor(GLR) didn' t show significant tendency and Aquaporin 1(AQP1) and Aquaporin 3(AQP3) showed constant expression level. With sharp salinity level increasing from 5‰ to 30‰, expression of PLR, GHR, and IGR were temporary decreased but recovered within a few days showing that Takifugu obscurus has a strong adaptation ability to change of environmental salinity.
In the constant 5‰ salinity, the survival rate was rapidly declined until salinity was changed to 30‰ and showed a constant rate in the salinity of 30‰. Final survival rate was 86.4±0.7% with increasing of 1‰/day, 91.3±0.3% with 2‰/day, and 54.3±0.5% with sharp increase from constant 5‰ to 30‰. This results confirm that Takifugu obscurus at the point of 15days after hatchling has a ability to adapt in sea water. And relatively lower survival rate with sharp
increased salinity shows juvenile Takifugu obscurus must migrate from inland water to sea water as they growth.