海南岛东部海域拖网网囊网目选择性研究

doi:10.16378/j.cnki.1003-1111.23091

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Abstract In order to support the implementation and management of “National Marine Fishing Gear Catalogue”, a selective test of five diamond mesh sizes of 25 mm (control group), 30 mm, 35 mm, 40 mm and 45 mm was carried out in trawlers in April 2022 by using the combined operation method in the eastern waters at Hainan Island (E 110°39′—111°12′, N 19°01′—19°33′). The selective analysis of 4 mesh sizes was carried out by using logistic curve and maximum likelihood estimation method. The results showed that the 50% selection of body length (L₅₀)was 94.6 mm, 104.5 mm, 125.0 mm and 143.0 mm for Saurida tumbil at mesh size of 30 mm, 35 mm, 40 mm and 45 mm,with selection range of 22.2 mm, 34.4 mm, 23.2 mm and 26.1 mm. The L₅₀ for Trachinocephalus myops was 86.1 mm, 96.1 mm and 115.2 mm, corresponding selection range of 29.4 mm, 20.0 mm and 27.0 mm; the L₅₀ for Polynemus sextarius was 65.9 mm, 73.8 mm, 89.6 mm and 103.1 mm, corresponding selection range of 9.2 mm, 18.0 mm, 24.2 mm and 21.2 mm; the L₅₀ for Upeneus bensasi was 82.6 mm, 89.5 mm and 100.0 mm,corresponding selection range of 28.8 mm, 26.3 mm and 33.5 mm. The relationship between codend mesh size of S. tumbil, T. myops, P. sextarius, and U. bensasi and L₅₀ was expressed as:公式,公式 and 公式, respectively, the minimum mesh size of 43.9 mm in S. tumbil, 59.5 mm in T. myops, 58.5 mm in P. sextarius, and 33.2 mm in U. bensasi. In conclusion, the suitable mesh size of trawl codend should be 43.9 mm.

Key words： demersal trawl combined drag method diamond mesh mesh size selectivity

Received: 22 November 2023

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	Articles by authors
	ZHAO Hailong
	LIU Wei
	WU Chenghong
	CHEN Min
	ZHANG Yuxiang

Cite this article:

ZHAO Hailong,LIU Wei,WU Chenghong, et al. Codend Mesh Selectivity of Trawl in the Eastern Waters at Hainan Island[J]. Fisheries Science, 2025, 44(1): 91-99.

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https://www.shchkx.com/EN/10.16378/j.cnki.1003-1111.23091 OR https://www.shchkx.com/EN/Y2025/V44/I1/91

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