Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
권호 표지

Ecology of Iksookimia longicorpa (Cobitidae) in the Seomjin River, Korea

섬진강에 서식하는 왕종개 Iksookimia longicorpa (Cobitidae)의 생태

  • Kim, Ik-Soo (Faculty of Biological Sciences, Chonbuk National University) ;
  • Ko, Myeong-Hun (Faculty of Biological Sciences, Chonbuk National University)
  • 김익수 (전북대학교 자연과학대학 생물과학부) ;
  • 고명훈 (전북대학교 자연과학대학 생물과학부)
  • Received : 2005.04.02
  • Accepted : 2005.06.04
  • Published : 2005.06.30
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Abstract

Iksookimia longicorpa was investigated in the upper part of the Seomjin River in Korea from 2003 to 2004. It inhabited pebble and cobble bottoms with water-current velocities of 10~30 cm/sec and depths of 30~100 cm. This species is active during daylight hours from March to October but hibernated in the river bottoms in the winter season. The sex ratio of female to male was 1 : 0.65, and the female was 20~40 mm larger than the male. Female length frequencies in this population indicated that the 65~90 mm group is 1+years old, the 90~110 mm group is 2+ years old, and the 110~130 mm group is 3+ years old. The males developed a secondary sexual character, the lamina circularis at the base of their pectoral fin, after 13~14 months. The spawning season was from early to middle June with water temperatures of $20{\sim}24^{\circ}C$ individuals became sexually mature after the age of 2 years. The average number of eggs in the ovaries was $2,402{\pm}944$. Stomach contents were mainly Chironomidae, Ephemeroptera, Arcellidae and Algae. The feeding rate was highest in April and September; they did not fed in the winter.

Keywords

References

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