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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

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Journal of Oceanology and Limnology 2018年第5期36卷 1880-1890页

作者： YANG Bingzhong YANG Lin TAN Yongguang YAN Lei ZHANG Peng LI Jie South China Sea Fisheries Research Institute Chinese Academy of Fishery Science Key Lab of South China Sea Fishery Resources Exploitation ＆ Utilization Ministry of AgricultureGuangzhou 510300China

The shrimp beam trawl fishery in the northern South China Sea is characterized by high by-catch and poor selectivity *** by-catch species,banded scad(Caranx(Atule)kalla)is economically the most important *** aim of this study is to improve the selective properties of codends for banded *** 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,with25 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 and18 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 *** parameters were obtained using the logistic equation with the maximum likelihood method,by incorporating the between-haul *** 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 *** S35+D25 codend is proved to be the most eff ective codend to release immature banded scad,and its 50%retention length(L _(50))is larger than the minimum landing size(MLS=63.5 mm)of banded ***,the 95%confidence intervals of L _(50) overlap among the three combined mesh codends,the S25+D25,S30+D25 and S35+D25 *** a sustainable exploitation of banded scad,larger mesh sizes are suggested to be investigated for the combined mesh codends.

关键词： shrimp beam trawl diamond mesh codend combined square and diamond mesh codend banded scad Caranx (Alule) kalla size selectivity

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Square mesh codend improves size selectivity and catch pattern for Trichiurus lepturus in bottom trawl used along Northwest coast of India

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Aquaculture and Fisheries 2023年第5期8卷 564-571页

作者： Madhu Vettiyattil Bent Herrmann Meenakumari Bharathiamma ICAR-Central Institute of Fisheries Technology MatsyapuriWillingdon IslandCochinKerala682029India SINTEF Ocean Fishing Gear TechnologyWillemoesvej 2Hirtshals9850Denmark University of Tromsø BreivikaTromsø9037Norway DTU Aqua Technical University of DenmarkHirtshals2800Denmark Division of Fisheries Science Krishi Anusandhan Bhawan-IIIndian Council of Agricultural ResearchNew Delhi110012India

The size selectivity and catch pattern of Trichiurus lepturus in 40 mm diamond and square mesh codends were investigated in this study.A 34 m high opening trawl was used,which is a common design used by fishermen operating along the northwest coast of India,and the cover codend method was employed to determine codend *** with the changes in the length at 50%retention rate for Trichiurus lepturus with the usage of the square and diamond mesh codends,indicators to understand the exploitation pattern of this species in the fishery were assessed based on the total number of individuals and on total weight of the *** mean selection length increased and discard fraction is reduced when 40 mm square mesh codends are used in place of diamond meshes,however,it is observed that individuals at commercial length are also *** results demonstrate that mandatory use of legal mesh sizes alone will be insufficient to aid in the sustainable harvest of this species,given its estimated length at first sexual maturity of 61.2 *** is the first study to compare the size selection of this species in 40 mm diamond and square mesh codends along Northwest coast of *** of the study will help as a baseline for gear-based regulations in the region.

关键词： size selectivity Trichiurus lepturus Square mesh Codend India

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Comparing the size selectivity of a novel T90 mesh codend to two conventional codends in the northern shrimp(Pandalus borealis)trawl fishery

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Aquaculture and Fisheries 2021年第4期6卷 382-392页

作者： Haraldur Arnar Einarsson Zhaohai Cheng Shannon M.Bayse Bent Herrmann Paul DWinger Marine and Freshwater Research Institute Skúlagata 4101ReykjavíkIceland Centre for Sustainable Aquatic Resources Fisheries and Marine InstituteMemorial UniversityP.O.Box 4920St.John’sNLA1C 5R3Canada SINTEF Ocean Fishing Gear TechnologyWillemoesvej 29850HirtshalsDenmark University of Tromsø BreivikaN-9037TromsøNorway

The size selectivity and usability of three codends were quantified and compared for the first time in the inshore Northern shrimp(Pandalus borealis)trawl fishery of Iceland using the covered codend method:a conventional diamond-mesh codend(T0),conventional square-mesh codend(T45),and a 90◦turned mesh codend(T90)constructed of four panels and with shortened lastridge ***,wanting to increase the average-individual size of captured shrimp,had requested the T90 codend to be compared with conventional codends for consideration in the *** showed that,on average,the T45 and T90 codends had better size selectivity than the T0 codend in terms of releasing individuals smaller than 13 mm carapace length(Minimum References size;MRS).The T90 codend retained significantly less Northern shrimps between 9 and 19 mm than the T0 codend and between 15 and 19 mm than the T45 *** significant difference of size selectivity between T45 and T0 codends was *** three codends presented high retention ratios of Northern shrimps above MRS(>63%)for the population ***,the T0 codend was not effective at sorting out small Northern shrimps;at least 86%of Northern shrimps smaller than 13 mm were retained in the T0 codend if *** from T45 and T90 codends had a lower proportion of shrimp below *** discarding of undersized Northern shrimps is prohibited in Iceland and fishers wanted to catch on average larger shrimp,using the novel T90 codend would enable fishers to use their quotas more efficiently.

关键词： size selectivity Codend usability Pandalus borealis Diamond-mesh T45 T90 Iceland Lastridge rope

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size selectivity in macroscopic supramolecular assembly by introducing flexible space coating

Size selectivity in macroscopic supramolecular assembly by i...

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中国化学会第29届学术年会

作者： Raheel Akram Feng Shi State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology

To design the assembly of ordered structures at macroscopic level, the strategy of anisotropic surface modifications or magnetic induced assembly provides possible methods;however, there remain challenges to either fabricate complex building blocks or stepwise construct with magnetic field. Therefore, we have introduced feasible approach of size selectivity in programming of the supramolecular assembling components by selecting and optimizing the diameter/height（d/H） ratio of cylindrical building blocks. Based on the principle of flexible spacing coating for realization of macroscopic supramolecular assembly, we have obtained preferred geometry of complementary assembled structure associated with host-guest interaction by using an optimized d/H ratio. Moreover, the size selectivity was further understood through in situ measurements of binding forces between building blocks.

关键词： size selectivity diameter/height(d/H) macroscopic supramolecular assembly flexible spacing coating

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selectivity of escape-hole size in tube traps for white-spotted conger Conger myriaster

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Chinese Journal of Oceanology and Limnology 2011年第5期29卷 1041-1047页

作者：杨炳忠唐衍力梁振林 Fisheries College Ocean University of China Marine College Shandong University at Weihai

Comparative fishing experiments were carried out in 2010 using tube traps with five hole diameters (8, 15, 18, 20 and 22 mm) to establish the size selectivity of escape holes for white-spotted conger. selectivity and split parameters of the SELECT model were calculated using the estimated-split and equal-spilt model. From likelihood ratio tests and AIC (Akaike's Information Criterion) values, the estimated-split model was selected as the best-fit model. size selectivity of escape holes in the tube traps was expressed as a logistic curve, similar to mesh selectivity. The 50% selection length of white-spotted conger in the estimated-split model was 28.26, 33.35, 39.31 and 47.30 cm for escape-hole diameters of 15, 18, 20 and 22 mm, respectively. The optimum escape-hole size is discussed with respect to management of the white-spotted conger fishery. The results indicate that tube traps with escape holes of 18 mm in diameter would benefit this fishery.

关键词： Conger myriaster escape hole size selectivity SELECT model

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Smaller bar spacings in a Nordmøre grid reduces the bycatch of redfish(Sebastes spp.)in the offshore Northern shrimp(Pandalus borealis)fishery of eastern Canada

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Aquaculture and Fisheries 2023年第6期8卷 661-671页

作者： Tomas Araya-Schmidt Shannon M.Bayse Paul D.Winger Colin H.Frank Centre for Sustainable Aquatic Resources Fisheries and Marine InstituteMemorial University of NewfoundlandSt.John’sNLA1C 5R3Canada

The offshore Northern shrimp(Pandalus borealis)bottom trawl fishery in eastern Canada currently uses 22 and 28 mm bar spacing Nordmøre grids to limit bycatch from using small mesh ***,a recent rebound of juvenile redfish(Sebastes spp.),that can pass through the grids,has greatly increased *** address this concern,this study investigated the effectiveness of 17 and 15 mm bar spacing Nordmøre grids in a twin-trawl(paired)configuration against the traditional 22 mm bar spacing *** selectivity analyses showed that the 17 and 15 mm grids resulted in no significant reduction in shrimp catch across all length *** 17 mm grid significantly reduced redfish bycatch for all length classes and the 15 mm grid significantly reduced redfish bycatch for individuals larger than 95 mm total *** redfish entered the codend with the experimental grids,however,the overlap in width between redfish and Northern shrimp limits the overall sorting efficiency of the grids,leaving some redfish still vulnerable to capture.

关键词： size selectivity Twin trawling Catch comparison Bycatch reduction device

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