|
|
|
| Catching Performance of Combination of Square and Diamond Mesh Codend of Trawl in the Northern Part of South China Sea |
| YAN Lei1,2, YANG Bingzhong2,3, LI Yanan2,3 |
1. South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China;
2. Key Laboratory of Open-Sea Fishery Resources Exploitation & Utilization Development, Ministry of Agriculture and Rural Affairs, Guangzhou 510300, China;
3. College of Animal Science & Technology, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China |
|
|
|
|
Abstract In order to evaluate the mesh selectivity of combination of square and diamond mesh codend for the main catches of trawl in the northern South China Sea, the captive selectivity was comparatively investigated in combined mesh codend (treatment net group) and traditional-diamond mesh codend (control net group) using the covered net method, and the selectivity curves were fitted with Logistic and Richards curves to analyze the selectivity performance of 2 different mesh structure codends for blue round scad Decapterus maruadsi in the northern South China Sea. The results showed that there were eight species with number escape rate and biomass escape rate higher than 80% in the treatment net group, while there were only five species in the control net group. As the highest quality catch species in the two mesh codends, the number escape rate and mass escape rate of blue round scad were found to be 25.35% and 20.98% in the treatment net group, and 16.39% and 15.48% in the control net group, respectively. The selectivity showed that the Richards curves of the two nets were better fitted, with smaller model residuals and Akaike's information index (AIC values), and the 50% retention lengths (L50) for blue round scad were 14.31 cm and 13.60 cm, respectively. In summary, there were higher escape rates in the reatment net for a variety of bycatch. The findings indicated that application of the combined square and diamond mesh codend effectively improved the trawl selectivity and protected the sustainable use of fishery resources.
|
|
Received: 24 August 2021
|
|
|
|
|
|
[1]农业农村部渔业渔政管理局,全国水产技术推广总站,中国水产学会.2020中国渔业统计年鉴[M].北京:中国农业出版社,2020:38-46.
[2]杨吝.南海区海洋渔具渔法[M].广州:广东科技出版社,2002:85-90.
[3]孙满昌.渔具渔法选择性[M].北京:中国农业出版社,2004:57-60.
[4]张健,孙满昌,钱卫国.桁拖网不同网目结构网囊对主要鱼类的选择性研究[J].上海水产大学学报,2008,17(4):457-463.
[5]张旭丰,张鹏,谭永光,等.南海北部拖网30.3 mm方形网目网囊的渔获选择性分析[J].南方水产,2006,2(2):51-55.
[6]YANG B Z, YANG L, TAN Y G, et al. Size selectivity of combined square and diamond mesh codends of shrimp beam trawl for banded scad Caranx (Atule) kalla in the northern South China Sea[J].Journal of Oceanology and Limnology,2018,36(5):1880-1890.
[7]尤宗博,赵宪勇,李显森,等.黄海双船变水层拖网网囊的网目选择性研究[J].水产科学,2017,36(4):436-442.
[8]BROADHURST M K, MILLAR R B. Square-mesh codend length and selectivity in southeastern Australian stow nets[J].Fisheries Management and Ecology,2011,18(1):39-49.
[9]FRANDSEN R P, MADSEN N, KRAG L A. Selectivity and escapement behaviour of five commercial fishery species in standard square-and diamond-mesh codends[J].ICES Journal of Marine Science,2010,67(8):1721-1731.
[10]杨吝,张旭丰,谭永光.南海区拖网方目网囊选择性试验[J].湛江海洋大学学报,2002,22(4):44-51.
[11]许庆昌,李显森,孙珊,等.黄海双船变水层疏目拖网网囊网目尺寸选择性研究[J].中国海洋大学学报(自然科学版),2020,50(5):53-60.
[12]宋学锋,陈雪忠,黄洪亮,等.东海区底拖网对小黄鱼的选择性研究[J].上海海洋大学学报,2015,24(3):449-456.
[13]杨炳忠,杨吝,谭永光,等.基于裤式拖网法的虾拖网网囊网目选择性试验与分析[J].中国海洋大学学报(自然科学版),2020,50(4):36-44.
[14]杨炳忠,杨吝,谭永光,等.南海区虾拖网网囊对刀额新对虾的选择性研究[J].南方水产科学,2019,15(2):1-11.
[15]杨吝,谭永光,张旭丰.南海底拖网方、菱目网囊选择性研究[J].湛江海洋大学学报,2002,22(3):19-25.
[16]张旭丰,杨吝,谭永光,等.方目网囊对蓝圆鲹和多齿蛇鲻的选择性比较[J].湛江海洋大学学报,2002,22(3):26-32.
[17]MILLAR R B, FRYER R J. Estimating the size-selection curves of towed gears, traps, nets and hooks[J].Reviews in Fish Biology and Fisheries,1999,9(1):89-116.
[18]WILEMAN D A, FERRO R S T, FONTEYNE R, et al. Manual of methods of measuring the selectivity of towed fishing gear[R]. Copenhagen:ICES Cooperative Research Report,1996:1-63.
[19]FUJIMORI Y, TOKAI T. Estimation of gillnet selectivity curve by maximum likelihood method[J].Fisheries Science,2001,67(4):644-654.
[20]陈丕茂.南海北部主要捕捞种类最适开捕规格研究[J].水产学报,2004,28(4):393-400.
[21]李纯厚,贾晓平,杜飞雁,等.南海北部生物多样性保护现状与研究进展[J].海洋水产研究,2005,26(3):73-79.
[22]邹建伟.南海南部拖网渔场开发现状分析[J].现代渔业信息,2011,26(12):3-5.
[23]SALA A, LUCCHETTI A, PICCINETTI C, et al. Size selection by diamond-and square-mesh codends in multi-species Mediterranean demersal trawl fisheries[J].Fisheries Research,2008,93(1/2):8-21.
[24]BAHAMON N, SARDÁ F, SUURONEN P. Improvement of trawl selectivity in the NW Mediterranean demersal fishery by using a 40 mm square mesh codend[J].Fisheries Research,2006,81(1):15-25.
[25]CAMPOS A, FONSECA P, ERZINI K. Size selectivity of diamond and square mesh cod ends for four by-catch species in the crustacean fishery off the Portuguese south coast[J].Fisheries Research,2003,60(1):79-97.
[26]孙满昌,张健,钱卫国.套网法对张网渔具选择性的影响[J].水产学报,2004,28(6):709-715.
[27]张健,石建高,张鹏,等.多囊桁拖网选择性研究中对照网囊网目尺寸的选择[J].水产学报,2010,34(1):160-167.
[28]ROBERT M, MORANDEAU F, SCAVINNER M, et al. Toward elimination of unwanted catches using a 100 mm T90 extension and codend in demersal mixed fisheries[J].PLoS One,2020,15(7):e0235368.
[29]BAYSE S M, HERRMANN B, LENOIR H, et al. Could a T90 mesh codend improve selectivity in the Belgian beam trawl fishery?[J].Fisheries Research,2016,174:201-209.
[30]WIENBECK H, HERRMANN B, MODERHAK W, et al. Effect of netting direction and number of meshes around on size selection in the codend for Baltic cod (Gadus morhua)[J].Fisheries Research,2011,109(1):80-88.
[31]梅春,徐宾铎,薛莹,等.胶州湾中部海域秋、冬季鱼类群落结构及其多样性研究[J].中国水产科学,2010,17(1):110-118. |
|
|
|
