南海北部拖网对蓝圆鲹的选择性研究

李亚男; 杨炳忠; 张鹏; 李杰; 王腾; 晏磊

doi:10.12131/20210256

南海北部拖网对蓝圆鲹的选择性研究

doi: 10.12131/20210256

李亚男^{1, 2,},
杨炳忠^{2, 3},
张鹏^{2, 3},
李杰^{2, 3},
王腾^{2, 3},
晏磊^{2, 3, ,}

1.
仲恺农业工程学院动物科技学院，广东广州 510225
2.
农业农村部外海渔业可持续利用重点实验室，广东广州 510300
3.
中国水产科学研究院南海水产研究所，广东广州 510300

基金项目: 中国水产科学研究院南海水产研究所中央级公益性科研院所基本科研业务费专项资金资助 (2020YJ01)；农业部财政重大专项 (NFZX2018)；农业农村部财政项目 (1720018)

详细信息

作者简介:
李亚男 (1987—)，女，副教授，博士，从事生态渔业研究。E-mail: liyanan@zhku.edu.cn

通讯作者:
晏　磊 (1988—)，男，助理研究员，硕士，从事生态渔具渔法研究。E-mail: yanlei@scsfri.ac.cn

中图分类号: S 975
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- 文章访问数: 464
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- 被引次数: 0
出版历程
- 收稿日期: 2021-09-06
- 修回日期: 2021-10-13
- 录用日期: 2021-10-20
- 网络出版日期: 2021-10-29
- 刊出日期: 2022-06-05

Size selectivity of codend mesh size of trawl for Decapterus maruadsi in northern part of South China Sea

LI Yanan^{1, 2
,},
YANG Bingzhong^{2, 3},
ZHANG Peng^{2, 3},
LI Jie^{2, 3},
WANG Teng^{2, 3},
YAN Lei^{2, 3
, ,}

1.
Zhongkai University of Agriculture and Engineering/College of Animal Science and Technology, Guangzhou 510230, China
2.
Key Laboratory for Sustainable Utilization of Open-sea Fishery, Ministry of Agriculture and Rural Affairs, Guangzhou 510300, China
3.
South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China

摘要

摘要: 为确定南海拖网最小网目尺寸标准的适应性，采用套网法在南海北部对网目尺寸分别为30、35、40和45 mm的菱形网目（分别以D30、D35、D40和D45表示）进行了选择性试验。使用Logistic和Richards模型分别拟合了不同网目网囊下蓝圆鲹 (Decapterus maruadsi) 的选择性曲线，并通过比较两种模型的偏差和自由度确定最佳拟合曲线。结果显示，Logistic曲线对D30、D35和D45网囊的拟合效果更好，而Richards曲线对D40网囊的拟合效果更好。D30、D35、D40和D45网囊对蓝圆鲹的50%选择叉长 (50% retention fork length, L_0.5) 分别为12.43、12.88、13.60和16.79 cm，选择范围 (Selection range, SR) 分别为8.45、6.75、6.08和2.19 cm。随着网目尺寸的增大，蓝圆鲹的L_0.5逐渐增加，而SR逐渐减小。根据蓝圆鲹的L_0.5和网目大小关系式计算得出的最小网目尺寸为41.39 mm。为保护蓝圆鲹等中小型经济鱼类，建议将南海拖网菱形网囊最小网目尺寸设定为45 mm。
- 蓝圆鲹 /
- 拖网选择性 /
- 最小网目尺寸 /
- 套网法 /
- 南海
Abstract: To determine the suitability of minimum mesh size standards for trawls in the South China Sea, we conducted selectivity tests in that area by using the covered net method with mesh sizes of 30, 35, 40 and 45 mm (Denoted as D30, D35, D40 and D45, respectively). We used Logistic and Richards models to fit selectivity curves for Decapterus maruadsi by the maximum likelihood method, and determined the best-fitting curves by comparing the model deviations and degrees of freedom of the two models. The results show that the Logistic curve fitted better for D30, D35 and D45 mesh codend, while the Richards curve fit better for D40 mesh codend. The 50% retention fork lengths (L_0.5) of D. maruadsi for D30, D35, D40 and D45 were 12.43, 12.88, 13.60 and 16.79 cm, respectively. As the mesh size increased, the L_0.5 of D. maruadsi increased but the selection range decreased gradually. The minimum mesh size was 41.39 mm based on the relationship between L_0.5 and mesh size of D. maruadsi. Thus, 45.39 mm is suggested as the minimum mesh size for trawl in the South China Sea to protect small and medium-sized economic fish such as D. maruadsi.
- Decapterus maruadsi /
- Trawl selectivity /
- Minimum mesh size /
- Covered net method /
- South China Sea

HTML全文

图 1 试验拖网的网衣展开图

Figure 1. Specification of tested trawl

下载: 全尺寸图片幻灯片

图 2 蓝圆鲹叉长分布图

Figure 2. Fork length distribution of D. maruadsi

下载: 全尺寸图片幻灯片

图 3 蓝圆鲹的选择性曲线

Figure 3. Selectivity curve of D. maruadsi with different mesh sizes

下载: 全尺寸图片幻灯片

表 1 试验网囊和套网规格

Table 1. Specification of codend and cover net

网目 Mesh	纵向目数 Longitudinal mesh amount	长度 Length/m	横向目数 Transversal mesh amount	周长 Circumference/m	有效网次 Effective haul	网目尺寸 Mesh size/mm	网线结构 Netting structure
D30	400	12.0	300	9.0	9	30.05±1.50	12×3×2
D35	345	12.0	260	9.0	9	34.20±0.80	12×3×2
D40	300	12.0	224	9.0	10	39.42±0.99	12×3×2
D45	265	12.0	200	9.0	9	42.66±1.16	12×3×2
套网 Cover net	720	14.4	540	10.8	—	20	7×3

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表 2 蓝圆鲹的Logistic和Richards曲线的估计参数和假设检验

Table 2. Estimated parameters and test of hypotheses of Logistic and Richards curves for D. maruadsi

	参数 Parameter	D30		D35
	参数 Parameter	Logistic^*	Richards	Logistic^*	Richards
选择性参数a		−3.23±0.61	−2.47±4.39	−4.19±1.43	−0.55±67.13
选择性参数 b		0.26±0.04	0.24±0.11	0.33±0.08	0.27±0.19
非对称程度的控制参数 δ			0.69±1.60		0.08±5.29
50%选择叉长 L_0.5		12.43±0.70	12.37±10.14	12.88±1.18	12.72±2.51
选择范围 SR		8.45±1.18	8.29±14.63	6.75±1.70	6.10±38.27
Akaike信息法则 AIC		65.34	67.31	47.83	51.05
H₀: Model fit	模型残差 DR	28.06	42.22	22.21	23.43
	自由度 DF	17	16	11	10
	P	0.044	0.000	0.023	0.009
H₁: δ=1	模型残差 DR		14.16		1.22
	自由度 DF		1		1
	P		0.000		0.270

	参数 Parameter	D40		D45
	参数 Parameter	Logistic	Richards^*	Logistic^*	Richards
选择性参数 a		−8.51±2.54	−31.95±29.34	−16.85±1.92	−24.64±8.24
选择性参数 b		0.62±0.16	1.83±1.60	1.00±0.11	1.37±0.41
非对称程度的控制参数 δ			10.10±13.14		2.47±1.55
50%选择叉长 L_0.5		13.83±0.66	13.60±29.82	16.79±0.11	16.83±10.83
选择范围 SR		3.57±0.91	6.08±1.88	2.19±0.24	2.44±0.27
Akaike信息法则 AIC		52.26	48.68	31.42	31.96
H₀: Model fit	模型残差 DR	34.31	28.73	4.51	3.06
	自由度 DF	10	9	15	14
	P	0.000	0.001	0.996	0.999
H₁: δ=1	模型残差 DR		5.58		1.45
	自由度 DF		1		1
	P		0.018		0.228
注：. 本曲线拟合较好。 Note: . The curve will be applied.

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