Evaluation of saury stick-held net performance between model test and on-sea measurements

Shi Yongchuang; Zhu Qingcheng; Hua Chuanxiang; Zhang Yandong

doi:10.3969/j.issn.0253-4193.2019.02.012

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Shi Yongchuang, Zhu Qingcheng, Hua Chuanxiang, Zhang Yandong. Evaluation of saury stick-held net performance between model test and on-sea measurements[J]. Haiyang Xuebao, 2019, 41(2): 123-133. doi: 10.3969/j.issn.0253-4193.2019.02.012

Citation:

Shi Yongchuang, Zhu Qingcheng, Hua Chuanxiang, Zhang Yandong. Evaluation of saury stick-held net performance between model test and on-sea measurements[J]. Haiyang Xuebao, 2019, 41(2): 123-133. doi: 10.3969/j.issn.0253-4193.2019.02.012

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Evaluation of saury stick-held net performance between model test and on-sea measurements

doi: 10.3969/j.issn.0253-4193.2019.02.012

1.
College of Marine Culture and Law, Shanghai Ocean University, Shanghai 201306, China
2.
College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China;National Engineering Research Center for Pelagic Fishery, Shanghai Ocean University, Shanghai 201306, China;Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai 201306, China
3.
College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China

Received Date: 2018-02-27
Rev Recd Date: 2018-06-12

Abstract

Abstract

The stick-held net is one of the main methods for the fishing of saury (Cololabis saira), which is being rapidly promoted due to the high catch rate. Model tests and on-sea surveys are the two most common ways to study the performance of the fishing gear. The comparative evaluation of the two test results is of great significance for the better determination of the net workability. Based on the model net test of stick-held net in November-December 2014 and the on-sea measurement of stick-held net at the "Lupengyuanyu 019" in July-October 2015 and June-October 2016, the method of multivariate linear regression is used to standardize the sinking depth and speed of the rising. Bootstrap method is used to analyze the experimental model of the rigging and the measured results at sea. The results show that:(1) The mean distribution range of normalized maximal sinking depth is 20.37-29.54 m and the 95% confidence interval is 21.76-28.13 m by Bootstrap method. The range of the maximum sinking depth of the model net is 26.42-37.58 m, 95% confidence interval is 27.70-36.20 m. The average net sinking depth of the measured network with the central part is about 0.731-0.783 times the average maximum sinking depth of the central part of the model network. (2) According to the Bootstrap method, the average velocity of the measured network is 0.107-0.193 m/s and the 95% confidence interval is 0.111-0.191 m/s. The range of the model network with the average speed of ascension is 0.204-0.316 m/s, 95% confidence interval is 0.207-0.312 m/s. Measured network with the central upgrade speed is about the average model network with the central upgrade speed of 0.591-0.611 times. (3) When the current velocity is assumed to be 0, the average sinking depth of the measured network is calculated as 29.14-41.21 m, which is about 0.751-0.807 times of the average maximum sinking depth of the model network. (4) Both the current velocity of 30 m and the depth of 60 m have an impact on the settlement depth of the middle part of the physical net, and the influence of the flow velocity at the depth of 60 m is more significant (P<0.05).
- saury (Cololabis saira),
- stick-held net,
- sinking deep,
- rising speed,
- multiple regression analysis

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References(30)

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