Effects of Temperature and Salinity on Development of Sea Peach Halocynthia aurantium

붉은멍게 Halocynthia aurantium 발생에 관한 수온 및 염분의 영향

  • Lee, Chu (East Sea Fisheries Research Institute, NFRDI) ;
  • Park, Min-Woo (Aquaculture Management Division, National Fisheries Research and Development Institute) ;
  • Lee, Chae-Sung (East Sea Fisheries Research Institute, NFRDI) ;
  • Kim, Su-Kyoung (East Sea Fisheries Research Institute, NFRDI) ;
  • Kim, Wan-Ki (East Sea Fisheries Research Institute, NFRDI)
  • 이주 (국립수산과학원 동해수산연구소) ;
  • 박민우 (국립수산과학원 양식관리과) ;
  • 이채성 (국립수산과학원 동해수산연구소) ;
  • 김수경 (국립수산과학원 동해수산연구소) ;
  • 김완기 (국립수산과학원 동해수산연구소)
  • Published : 2009.10.30


The solitary ascidian, Halocynthia aurantium, which is commonly called the sea peach because of its coloration and general shape, is a valuable organism of benthic marine population in the northern region of the East Sea, Korea. It is seldom found at a depth of less than 10 meters and the sea peach is frequently observed in large populations between 20 and 100 meters. It appears to prefer attachment to vertical rocks faces and artificial cement blocks exposed to the currents. Mass mortality and reduction of resources in sea peach, H. aurantium, were occurred in the benthic area of the northern region of the East Sea because of the rapid fluctuation of environmental factors such as temperature and salinity due to mass rainfall in summer and going up north of a strong warm current in winter. Therefore, we examined the effects of temperature and salinity on embryonic development of fertilized eggs, tadpole larva to metamorphosis, and attachment to siphon development. Laboratory-raised larvae were studied using a two-factorial experimental design with four levels of temperature(8, 12, 16 and $20^{\circ}C$) and four levels of salinity(20, 25, 30 and 34 psu). The ascidian larvae of H. aurantium survived environmental conditions between temperature of $8{\sim}20^{\circ}C$ and salinity of 25~34 psu and exhibited positive growth at $8{\sim}16^{\circ}C$ and 30~34 psu. Fertilized eggs have not developed at lower salinity of 20 psu irrespective of temperature range tested and have showed an abnormal development at the salinity of 25 psu between higher temperatures of 20 and $24^{\circ}C$. This result suggests that temperature increase and salinity reduction depending on environmental fluctuation may have significant impacts on population variation of H. aurantium in the northern region of the East Sea.


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