Ground seawater quality was investigated, and the algal growth potential (AGP) tests were performed along the Tongyeong coast to examine the inflow of materials, which is needed for the red tide species Cochlodinium polykrikoides to grow. The study was conducted to determine the mechanism for C. polykrikoidesred tides. Water temperature, salinity, pH, and dissolved oxygen (DO) ranged from 16.05 to 20.74°C, 18.20 to 32.11 psu, 6.00 to 7.61, and 3.41 to 7.91 mg/L (41.4– 96.1%), respectively. No seasonal variation was observed in water temperature. The salinity, pH, and DO saturations at most stations were lower than those of coastal seawater at Tongyeong. The NH4 +-N, NO2+3 --N, PO4 3--P concentrations ranged from 0.43 to 16.00μM, 1.50 to 132.38μM, and 1.30 to 6.29μM, respectively; the values at some stations were much higher than observed in Tongyeong coast seawater. Using seawater from station B, C. polykrikoides grew consistently, with a high growth rate, similar to the red tide in nature. This seawater appeared to contain materials needed by C. polykrikoides to grow. Therefore, C. polykrikoides red tides seem to occur wherever the ground sea water contains materials that are needed for its growth.

Abstract
 1. 서 론
 2. 재료 및 방법
 3. 결 과
 4. 고 찰
  4.1. 지하해수의 수질특성
  4.2. C. polykrikoides의 증식촉진물질
  4.3. C. polykrikoides 적조 발생 가능 해역
 5. 결 론
 참 고 문 헌

• 이영식(국립수산과학원 내수면양식연구센터) | Young Sik Lee (Inland Aquaculture Research Center, NFRDI) Corresponding author
• 김윤빈(국립수산과학원 내수면양식연구센터) | Yoon Bin Kim (Inland Aquaculture Research Center, NFRDI)
• 한형균(국립수산과학원 내수면양식연구센터) | Hyung-Gyun Han (Inland Aquaculture Research Center, NFRDI)