Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Application of Sampling Theories to Data from Bottom Trawl Surveys Along the Korean Coastal Areas for Inferring the Relative Size of a Fish Population

한반도 연근해 저층 트롤 조사 자료에 표본론을 적용한 개체군의 상대적 크기 추정

  • Lee, Hyotae (Department of Marine Biology, Pukyong National University) ;
  • Hyun, Saang-Yoon (Department of Marine Biology, Pukyong National University)
  • 이효태 (부경대학교 해양생물학과) ;
  • 현상윤 (부경대학교 해양생물학과)
  • Received : 2017.07.26
  • Accepted : 2017.09.04
  • Published : 2017.10.31
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Abstract

The Korean National Institute of Fisheries Science (NIFS) has biannually (spring and fall, respectively) deployed a bottom trawl survey along the coastal areas for last decade, taking samples on a regular basis (i.e., a systematic sampling). Despite the availability of the survey data, NIFS has not yet officially reported the estimates of the groundfish population sizes as well as has not evaluated uncertainty of the estimates. The objectives of our study were to infer the relative size of a fish population, applying two different sampling techniques (namely simple and stratified sampling) with different observation units to the NIFS survey data, and to compare those two techniques in bias and precision. For demonstration purposes, we used data on Pacific cod (Gadus macrocephalus) collected by the 2011-2015 surveys, and the results of simple and stratified sampling showed that the point estimates and precision varied by observation unit as well as the sampling technique.

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References

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