Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
권호 표지

The Occurrence of Pseudo-silver eels with Different Silvering Index and Gonadal Development Stages in Anguilla japonica (Anguillidae) from Korean waters

국내에서 채집된 뱀장어 Anguilla japonica (Anguillidae)의 Silvering index와 생식소 발달 단계가 서로 다른 Pseudo-silver eels의 출현

  • Hong, Yang-Ki (Inland Fisheries Research Institute, National Institute of Fisheries Science) ;
  • Song, Mi-Young (Inland Fisheries Research Institute, National Institute of Fisheries Science) ;
  • Park, Hee-Won (Inland Fisheries Research Institute, National Institute of Fisheries Science) ;
  • Kang, Jung-Ha (Biotechnology Research Division, National Institute of Fisheries Science) ;
  • Lee, Wan-Ok (Inland Fisheries Research Institute, National Institute of Fisheries Science)
  • 홍양기 (국립수산과학원 중앙내수면연구소) ;
  • 송미영 (국립수산과학원 중앙내수면연구소) ;
  • 박희원 (국립수산과학원 중앙내수면연구소) ;
  • 강정하 (국립수산과학원 생명공학과) ;
  • 이완옥 (국립수산과학원 중앙내수면연구소)
  • Received : 2017.05.02
  • Accepted : 2017.06.05
  • Published : 2017.06.30
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Abstract

Three pseudo-silver eels (PS1~PS3) were found by analysis of silvering index and biological characteristics of 454 eels, Anguilla japonica, collected from the 9 sites of Korean fresh and brackish waters from September 2014 to August 2015. Two specimens (PS1~PS2) from Lake Soyang and one (PS3) from Geum river estuary were identified as pseudo-silver eel showing a large difference between silvering index and GSI. The external morphology of the pseudo-silver eels were in S2 (late silver eel) stage, but they were classified into Y1 (yellow eel) and Y2 (late yellow eel) stage in GSI, Gut index, Eye index and Y2 stage in gonadal development and mean egg diameter.

2014년 9월부터 2015년 8월까지 국내 9개 지점에서 채집된 Anguilla japonica 454개체의 생물학적 특성을 조사한 결과, silvering index (SI) 구분과 GSI의 차이가 큰 pseudo-silver eel이 소양호에서 2개체(PS1~PS2)와 금강하구에서 1개체(PS3)가 확인되었다. Pseudo-silver eel은 외부형태 기준으로는 S2 단계였으나, GSI, 소화관지수 (Gut index) 및 안경지수 (Eye index)에서는 모두 yellow eel 단계인 Y1 및 Y2였고, 생식소발달단계와 난경에서도 Y2 단계였다.

Keywords

References

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