The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY (한국해양학회지:바다)

The Korean Society of Oceanography (한국해양학회)
권호 표지

Establishment of Marine Ecotoxicological Standard Method for Larval Fish Survival Test

어류 자어의 사망률을 이용한 해양생태독성시험 방법에 관한 연구

  • Park, Gyung-Soo (Department of Marine Biotechnology, Anyang University) ;
  • Kang, Ju-Chan (Department of Aquatic Life Medicine, Pukyong National University) ;
  • Yoon, Sung-Jin (Korea Institute of Toxicology) ;
  • Lee, Seung-Min (Marine Environment Division of West Sea Fisheries Research Institute) ;
  • Hwang, Un-Ki (Marine Environment Division of West Sea Fisheries Research Institute)
  • 박경수 (안양대학교 해양생명공학과) ;
  • 강주찬 (부경대학교 수산생명의학과) ;
  • 윤성진 (안전성평가연구소) ;
  • 이승민 (국립수산과학원 서해수산연구소) ;
  • 황운기 (국립수산과학원 서해수산연구소)
  • Published : 2008.05.31
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Abstract

Marine ecotoxicological standard method using fish larvae was established with the standard test species of Oryzias latipes(Japanese Medaka) and Paralichthys olivaceus(flounder) and with the 7 day $LC_{50}$ as endpoint. Test method referred to the USEPA(1994) with the replacement of test species found in the Korean water. Standard test species were selected in terms of the species supply and ecological importance in Korean waters. Japanese medaka can be reared with small tanks in the lab and has wide tolerance on salinity, and flounder eggs can be easily obtained from commercial fish hatcheries. General conditions for larval fish toxicity test are as follows. The possible salinity ranges for toxicity test were $0{\sim}35\;psu$ for medaka and >20 psu for flounder. Test type was designated as static non-renewal test if the dissolved oxygen in the test chamber does not fall below 4.0 mg/L. Ages of test species were selected as 7 days after hatched for medaka(about 5 mm TL) and 25 days for flounder(about 10 mm TL) because of the low natural mortality after these periods. Test can be accepted when the survival rates are over 80% in control. Also, species sensitivity on standard reference materials(copper, cadmium or zinc) must be provided with the toxicity test results.

해양생태독성평가를 위한 표준시험방법 개발을 위하여 해양생태계의 대표 소비자인 어류를 이용한 시험방법을 정립하였다. 표준시험생물은 송사리(Oryzias latipes)와 넙치(Paralichthys olivaceus)를 선정하였으며, endpoint는 7일 자어 사망률(7 day-$LC_{50}$)로 설정하였다. 표준시험방법은 미환경보호국(USEPA, 1994)의 어류독성시험법을 참고하였으나, 시험생물은 생태적 대표성 및 종의 유용성 등을 고려하여 재설정하였다. 송사리는 실험실 사육이 가능하고 광염성이며, 넙치는 국내 연안 생태계의 대표 어류이자 상업용 종묘 생산 시설을 통하여 연중 시험생물 확보가 가능한 점을 고려하여 선정하였다. 염분 내성 및 표준물질독성실험결과, 송사리는 $0{\sim}35\;psu$ 구간에서 전개체가 생존하였으며, 넙치는 염분이 20 psu 이상에서만 실험이 가능하였다. 독성시험기간은 7일이며, 시험구내의 용존산소가 4mg/L 이상을 유지하는 한 시험용액의 교환없이 수행하는 비교환정수방식을 택하였다. 시험생물의 연령은 부화 후 초기 사망률과 시험시 취급이 용이한 크기로 선정하였으며, 송사리의 경우 부화 후 7일(전장 약 5 mm), 넙치의 경우 25일(전장 약 10 mm)로 선정하였다. 시험적합도 기준은 대조구에서의 생존율이 80% 이상으로 설정하였으며, 표준독성물질에 의한 민감도를 어류 독성 시험시 동일한 방법을 이용한 결과를 제시하도록 하였다.

Keywords

References

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