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Retention probability of trawl codend for silver croaker (Argyrosomus argentatus)

트롤 끝자루에 대한 보구치(Argyrosomus argentatus)의 망목 선택성

KIM, Pyungkwan;PARK, Chang-Doo;LEE, Chun-Woo;KIM, Hyung-seok
김병관;박창두;이춘우;김형석

  • Received : 2019.01.23
  • Accepted : 2019.02.21
  • Published : 2019.02.28

Abstract

The annual production of silver croaker (Argyrosomus argentatus) in Korean towed fishing gears has been increased in recent five years. In 2017, the annual production of silver croaker in metric ton was increased 99.2% compared to 2013. However, the research for silver croaker has been focused on ecology in Korea. There has not been enough research in terms of fishing gears. Therefore, the research for retention probability for towed gears was conducted on covered codend method from June, 2016 to July, 2018. During the experiments, the total catch of silver croaker was 1,563. The geometry of the experimental trawl gear was controlled by trawl monitoring system; net height was 3.3 m, distance of trawldoors was 59.8 m and distance of wing net was 17.3 m. The selection curve for silver croaker was estimated by a logit model. The analysis was applied with the confidence interval to reduce uncertainty of the estimation. The $l_{50}$ was 13.87 cm and its selection range was 2.71 cm. P-value was estimated at 0.99. The mesh size for silver croaker in towed gears needs to be adjusted by considering its minimum maturity length, stakeholder's interests and fisheries regulations.

Keywords

Retention probability;Confidence interval;Maximum likelihood method

Acknowledgement

Supported by : 국립수산과학원