Cite this paper:
YANG Bingzhong, YANG Lin, TAN Yongguang, YAN Lei, ZHANG Peng, LI Jie. 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]. HaiyangYuHuZhao, 2018, 36(5): 1880-1890

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

YANG Bingzhong, YANG Lin, TAN Yongguang, YAN Lei, ZHANG Peng, LI Jie
South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences;Key Lab of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture, Guangzhou 510300, China
Abstract:
The shrimp beam trawl fishery in the northern South China Sea is characterized by high by-catch and poor selectivity problems. Among by-catch species, banded scad (Caranx (Atule) kalla) is economically the most important one. The aim of this study is to improve the selective properties of codends for banded scad. Size selectivity of 2 traditional diamond mesh codends, with mesh size 25 and 30 mm (defined as D25 and D30, respectively), and 4 new combined square and diamond mesh codends, with 25 mm square-mesh and 25 mm diamond-mesh (S25+D25), 30 mm square-mesh and 25 mm diamondmesh (S30+D25), 35 mm square-mesh and 25 mm diamond-mesh (S35+D25), and 35 mm square-mesh and 18 mm diamond-mesh (S35+D18), were tested for banded scad in shrimp beam trawl fishery of the South China Sea. A total of 54 valid hauls were finished using the covered codend method, and 5750 banded scad were caught. Selective parameters were obtained using the logistic equation with the maximum likelihood method, by incorporating the between-haul variation. The results show that the present minimum mesh size for shrimp beam trawl in the South China Sea, 25-mm diamond mesh size, is insufficient to release immature banded scad. The S35+D25 codend is proved to be the most effective codend to release immature banded scad, and its 50% retention length (L50) is larger than the minimum landing size (MLS=63.5 mm) of banded scad. However, the 95% confidence intervals of L50 overlap among the three combined mesh codends, the S25+D25, S30+D25 and S35+D25 codend. For a sustainable exploitation of banded scad, larger mesh sizes are suggested to be investigated for the combined mesh codends.
Key words:    shrimp beam trawl|diamond mesh codend|combined square and diamond mesh codend|banded scad Caranx (Atule) kalla|size selectivity   
Received: 2017-03-08   Revised:
Tools
PDF (412 KB) Free
Print this page
Add to favorites
Email this article to others
Authors
Articles by YANG Bingzhong
Articles by YANG Lin
Articles by TAN Yongguang
Articles by YAN Lei
Articles by ZHANG Peng
Articles by LI Jie
References:
Broadhurst M K, Millar R B, Wooden M E L, Macbeth W G. 2006. Optimising codend configuration in a multispecies demersal trawl fishery. Fisheries Management and Ecology, 13(2):81-92.
Chen W Q, Jiang G L. 1990. A study of age and growth and the individual fecundity of Caranx (Atule) kalla in Daya Bay. Journal of Oceanography in Taiwan Strait, 9(3):222-230.(in Chinese with English abstract)
Deval M C, Bök T, Ateş C, Özbilgin H. 2006. Selectivity of PE and PA material codends for rose shrimp (Parapenaus longirostris) in Turkish twin rigged beam trawl fishery. Fish. Res., 81(1):72-79.
Deval M C, Bök T, Ateş C, Ulutürk T, Tosunoğlu Z. 2009. Comparison of the size selectivity of diamond (PA) and square (PE) mesh codends for deepwater crustacean species in the Antalya Bay, eastern Mediterranean. J.Appl. Ichthyol., 25(4):372-380.
Deval M C, Özgen G, Özbilgin H. 2016. Selectivity of 50 mm T0 and T90 codends for commercial shrimp species in the Turkish deepwater trawl fishery, Eastern Mediterranean.J. Appl. Ichthyol., 32(6):1 041-1 057.
Frandsen R P, Herrmann B, Madsen N, Krag L A. 2011.Development of a codend concept to improve size selectivity of Nephrops (Nephrops norvegicus) in a multispecies fishery. Fish. Res., 111(1-2):116-126.
Frandsen R P, Madsen N, Krag L A. 2010. Selectivity and escapement behaviour of five commercial fishery species in standard square-and diamond-mesh codends. ICES J.Mar. Sci., 67(8):1 721-1 731.
Fryer R J. 1991. A model of between-haul variation in selectivity. ICES J. Mar. Sci., 48(3):281-290.
Hall M A, Alverson D L, Metuzals K I. 2000. By-catch:problems and solutions. Marine Pollution Bulletin, 41(1-6):204-219.
Huang H L, Tang F H, Chen X Z, Zhang H, Li L Z, Song X F, Zhang S M, Wang D H. 2016. Nets selectivity of capsule size diamond mesh of Trichiurus haumela in East China Sea during Summer. Journal of Agricultural Resources and Environment, 33(5):433-442. (in Chinese with English abstract)
Kelleher K. 2005. Discards in the world's marine fisheries. An update. FAO Fisheries Technical Paper No. 470. Rome, FAO, 131p.
Madsen N, Herrmann B, Frandsen R P, Krag L A. 2012.Comparing selectivity of a standard and turned mesh T90 codend during towing and haul-back. Aquatic Living Resources, 25(3):231-240.
Madsen N, Holst R. 2002. Assessment of the cover effect in trawl codend selectivity experiments. Fish. Res., 56(3):289-310.
Mahjoub M S, Takeda S, Hayashi T, Shiode D, Arimoto T, Tokai T. 2011. Codend selectivity for jack mackerel and whitefin jack and unequal split parameter estimates observed in trouser trawl experiments. Fish. Sci., 77(2):169-181.
Millar R B, Broadhurst M K, Macbeth W G. 2004. Modelling between-haul variability in the size selectivity of trawls.Fish. Res., 67(2):171-181.
Millar R B, Fryer R J. 1999. Estimating the size-selection curves of towed gears, traps, and hooks. Rev. Fish Biol.Fish., 9(1):89-116.
Millar R B. 2010. Reliability of size-selectivity estimates from paired-trawl and covered-codend experiments. ICES J.Mar. Sci., 67(3):530-536.
Sala A, Lucchetti A, Perdichizzi A, Herrmann B, Rinelli P. 2015. Is square-mesh better selective than larger mesh? A perspective on the management for Mediterranean trawl fisheries. Fish. Res., 161:182-190.
Tokai T, Mitsuhashi T. 1998. SELECT model for estimating selectivity curve from comparative fishing experiments. Bulletin of the Japanese Society of Fisheries Oceanography, 62(3):235-247. (in Japanese with English abstract)
Tokai T. 1997. Maximum likelihood parameter estimates of a mesh selectivity logistic model through SOLVER on MSExcel. Bulletin of the Japanese Society of Fisheries Oceanography, 61(3):288-298. (in Japanese with English abstract)
Wienbeck H, Herrmann B, Feekings J P, Stepputtis D, Moderhak W. 2014. A comparative analysis of legislated and modified Baltic Sea trawl codends for simultaneously improving the size selection of cod (Gadus morhua) and plaice (Pleuronectes platessa). Fish. Res., 150:28-37.
Wienbeck H, Herrmann B, Moderhak W, Stepputtis D. 2011.Effect of netting direction and number of meshes around on size selection in the codend for Baltic cod (Gadus morhua). Fish. Res., 109(1):80-88.
Wileman D, Ferro R S T, Fonteyne R, Millar R B. 1996.Manual of methods of measuring the selectivity of towed fishing gears. ICES Cooperative Research Report, No. 215. p.1-126.
Yang B Z, Yang L, Zhang P, Tan Y G, Yan L, Chen S. 2015.Fish by-catch in shrimp beam trawls in the northern South China Sea. J. Appl. Ichthyol., 31(4):714-717.
Yang L, Lu H, Wu Z, et al. 2002a. Fishing gears and fishing methods in the South China Sea. Guangzhou, China, 237p. (in Chinese)
Yang L, Tan Y G, Zhang X F. 2002b. Selectivity of square and diamond mesh cod-ends of bottom trawl nets in South China Sea. Journal of Zhanjiang Ocean University, 22(3):19-25. (in Chinese with English abstract)
Yang L, Zhang X F, Tan Y G, Zhang P. 2003. Selectivity study on minimum mesh size of bottom trawl codend in South China Sea. Journal of Fishery Sciences of China, 10(4):325-332. (in Chinese with English abstract)
Yang L, Zhang X F, Tan Y G. 2002c. Selective experiments of square mesh cod-end of bottom trawl in South China Sea.Journal of Zhanjiang Ocean University, 22(4):44-51. (in Chinese with English abstract)