The effects of irradiance on the growth of toxic dinoflagellates Alexandrium tamarense (Masan Bay strain) and Alexandrium catenella (Jinhae Bay strain) were investigated in the laboratory. At 15℃ and 30 psu for A. tamarense and 25℃ and 30 psu for A. catenella, the irradiance-growth curve showed the maximum growth rate (μmax) of 0.31 day-1 with half-saturation photon flux density (PFD) (KI) of 44.53 μmol m-2 s-1, and a compensation PFD (Ic) was 20.67 μmol m-2 s-1 for A. tamarense, and μmax of 0.38 day-1 with KI of 59.53 μmol m-2 s-1, and Ic was 40.80 μmol m-2 s-1 for A. catenella. The Ic equated to a depth of 8~9 m from March to June for A. tamarense and 6~7 m from March to June for A. catenella. These responses suggested that irradiance at the depth near the middle layer in Masan Bay would provide favorable conditions for two species.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. Alexandrium tamarense와 Alexandrium catenella의 분리
  2.2. Alexandrium tamarense와 Alexandrium catenella의 성장에 미치는 조도의 영향
 3. 결과 및 고찰
 4. 결 론
 참 고 문 헌

• 오석진(부경대학교 해양학과) | Seok Jin Oh (Department of Oceanography, Pukyong National University) Corresponding author
• 양한섭(부경대학교 해양학과) | Han-Soeb Yang (Department of Oceanography, Pukyong National University)
• 박지아(부경대학교 해양학과) | Ji-A Park (Department of Oceanography, Pukyong National University)
• 권형규(부경대학교 해양학과) | Hyeong-Kyu Kwon (Department of Oceanography, Pukyong National University)