Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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A Comparative Study of Male Gonadal Development between Wild and Cultured Yellow Catfish, Pseudobagrus fulvidraco

자연산과 양식산 동자개 Pseudobagrus fulvidraco 정소의 생식소발달 비교 연구

  • Cho, Yun Jeong (Alpha Research Ecology Institute) ;
  • Yoo, Soo Hyang (Division of Ecological Conservation, National Institute of Ecology (NIE)) ;
  • Park, Cheol Woo (Alpha Research Ecology Institute) ;
  • Kim, Jong Wook (Alpha Research Ecology Institute) ;
  • Kim, Jae Goo (Alpha Research Ecology Institute) ;
  • Park, Jong Young (Faculty of Biological Science and Institute for Biodiversity Research, College of Natural Sciences, Chonbuk National University)
  • 조윤정 ((주)알파생태연구원) ;
  • 유수향 (국립생태원) ;
  • 박철우 ((주)알파생태연구원) ;
  • 김종욱 ((주)알파생태연구원) ;
  • 김재구 ((주)알파생태연구원) ;
  • 박종영 (전북대학교 자연과학대학 생물학과, 전북대학교 생물다양성연구소)
  • Received : 2020.05.11
  • Accepted : 2020.09.08
  • Published : 2020.09.30
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Abstract

Male gonadal development of the yellow catfish, Pseudobagrus fulvidraco, one of the most popular fish species in Korean aquaculture performance, was investigated by histological observation of monthly collected specimens to make comparisons between wild and cultured individuals. Their reproductive cycle was classified into the successive developmental stages as follows: a growing stage (April), a spawning stage (May), a degeneration stage (June to July), and a resting stage (August to October) in the wild and outdoor-cage individuals; a growing stage (April to June), a spawning stage (July to August), a degeneration stage (September), and a resting stage (October) in the indoor-cage ones. Values of gonadosomatic index (GSI) of wild and outdoor cages peaked in May, followed by a sudden decline in August~September and June~August, respectively. In contrast, GSI values of the indoor-cage individuals peaked in September and were followed by a sudden drop. Remarkable seasonal variation in condition factor (CF) was undetectable, peaking in June in the wild-cage individuals and November in the wild ones. Overall, our results suggest that it is suitable to use the male of the outdoor-cage individuals for artificial fertilization and that it is efficient to perform artificial fertilization in May, such as reproductive cycle of wild.

양식업에서 인기 있는 어종 중 하나인 동자개를 자연산과 양식산을 구분하여 생식소 발달을 관찰하였다. 자연산과 양식산 동자개는 2018년 4월에서 10월에 채집하여 수컷의 생식소 지수, 비만도지수 및 생식소 발달을 연구하였다. 광학현미경으로 관찰된 월별 생식소 발달과 GSI를 기반으로 생식소 발달 단계는 자연산과 실외 사육장은 4월 성숙기, 5월 산란기, 6월에서 7월 퇴화기, 8월에서 10월 휴지기로 관찰되었다. 실내 사육장은 4월에서 6월까지 성숙기, 7월에서 8월 산란기, 9월 퇴화기, 10월 휴지기로 구분되었다. GSI 값은 자연산과 실외 사육장은 5월에 가장 높은 값을 보였고, 실내 사육장은 9월에 가장 높은 값을 나타내 차이를 보였다. CF는 자연산과 양식산 사이에 유의한 차이가 없었으나 자연산은 6월에 가장 높은 값을 보였으며, 실외 사육장은 11월에 가장 높은 값을 보였다. 본 실험 결과, 실외 사육장 동자개 수컷을 인공 수정에 사용하는 것이 적합하며, 자연산 생식주기와 같은 5월에 인공 수정을 하는 것이 효율적일 것으로 판단된다.

Keywords

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