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Identification of Fishing State of Purse Seine Fishing Vessels Based on Multi-Indices

Journal of Ocean University of China 2023年第6期22卷 1605-1612页

作者： XU Zhenqi WANG Jintao ZHOU Cheng LEI Lin CHEN Xinjun LI Bin College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China Key Laboratory of oceanic Fisheries Exploration Ministry of Agriculture and Rural AffairsShanghai 201306China National Engineering Research Center for oceanic Fisheries Shanghai 201306China Key Laboratory of Sustainable Exploitation of oceanic Fisheries resources Ministry of EducationShanghai 201306China scientific observing and experimental station of oceanic fishery resources Ministry of Agriculture and Rural AffairsShanghai 201306China CNFC Overseas fishery Co. Ltd.Beijing 123445China

With the popularization of vessel satellite AIS(automatic identification system)equipment and the continuous improve-ment of the AIS data’s coverage,continuity and effectiveness,AIS has become an important data source to study the navigation char-acteristics of vessel groups.This study established an identification model to extract the fishing state and intensity information of fishing vessels,based on the AIS data of purse seine fishing vessels,combined with the variables of vessel position,speed and course.Expert experience,spatial statistics and data mining analysis methods were applied to establish the model,and the Western and Cen-tral Pacific Ocean areas were studied.The results showed that the overall accuracy of identification of the fishing state using Support Vector Machine method is higher,and the method has a good modeling effect.The spatial distribution characteristics of the vessels’fishing intensity based on AIS data showed a significant cluster distribution pattern.The obtained high-intensity fishing area can be used as a prediction of purse seine fishing grounds in the Western and Central Pacific areas.Through the processing and research of AIS data,this study provided important scientific support for the identification of fishing state of purse seine fishing vessels.The spatial fishing intensity of fishing vessels based on AIS data can also be used for the analysis of fishery resources and fishing grounds,and further serve the sustainable development of marine fisheries.

关键词： automatic identification system(AIS) fishing state machine learning fishing intensity

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Influence of environmental data of different sources on marine species habitat modeling:A case study for Ommastrephes bartramii in the Northwest Pacific Ocean

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Acta Oceanologica Sinica 2022年第1期41卷 76-83页

作者： Lin Lei Jintao Wang Xinjun Chen College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China Key Laboratory of Sustainable Exploitation of oceanic Fisheries resources of Ministry of Education Shanghai OceanShanghai 201306China National Engineering Research Centre for oceanic Fisheries Shanghai Ocean UniversityShanghai 201306China Key Laboratory of oceanic Fisheries Exploration Ministry of Agriculture and Rural AffairsShanghai 201306China scientific observing and experimental station of oceanic fishery resources Ministry of Agriculture and Rural AffairsShanghai 201306China

The quality of environmental data and its possible impact on the marine species habitat modelling are often overlooked while the sources for these data are increasing.This study selected sea surface temperature(SST)from two commonly used sources,the NOAA Ocean Watch and IRI/LDEO Climate Data Library,and then constructed habitat suitability index model to evaluate the influences of SST from the two sources on the outcomes of Ommastrephes bartramii habitat models for the months of July–October in the Northwest Pacific Ocean during 1996–2012.This study examined the differences in the amount of estimated unfavourable/favourable habitat area when the SST used for model building and inference were the same or different.Dynamics in suitable habitat area calculated from SST was insensitive to the two different SST products.In the fishing season of O.bartramii,the changes of magnitude and trend of monthly suitable habitat area in August and September were similar over time,whereas there were large differences for July and October.Importantly,there is a substantial lack of consistency in the O.bartramii habitat distribution based on SST of two sources.This study considered the sources of environmental data for habitat modelling and then inferred species habitat distribution whether by the same or different data source.

关键词： habitat suitability index model environmental data Ommastrephes bartramii Northwest Pacific Ocean

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Relationships between daily growth of different groups of swordtip squid(Uroteuthis edulis)and environmental variables in the East China Sea

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Acta Oceanologica Sinica 2022年第8期41卷 52-61页

作者： Nan Li Yan Wang Zhou Fang Xinjun Chen Zhiping Feng College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China National Engineering Research Center for oceanic Fisheries Shanghai Ocean UniversityShanghai 201306China Key Laboratory of Sustainable Exploitation of oceanic Fisheries resources of Ministry of Education Shanghai Ocean UniversityShanghai 201306China Key Laboratory of oceanic Fisheries Exploration Ministry of Agriculture and Rural AffairsShanghai 201306China scientific observing and experimental station of oceanic fishery resources Ministry of Agriculture and Rural AffairsShanghai 201306China

Swordtip squid(Uroteuthis edulis)is one of the important economical fishing target species in the East China Sea.Uroteuthis edulis is characterized by rapid growth,extensive migration,and long spawning period and sensitive to surrounding environment.In order to assess its stock status,it is necessary to explore its spawning season,growth patterns of different populations and their relationship with the environment in advance.In this paper,based on the samples of U.edulis collected in the East China Sea from September 2017 to March 2018,we explored the relationships between daily growth of statolith microstructure and environmental variables by gradient forest method and generalized additive model.The spawning season of U.edulis was found to be nearly one year,and two dominant season groups were found:the spring group with the peak period of April and the summer group with the peak period of August.Water temperature in the depth of 25 m(Temp_25),sea surface temperature(SST)and zonal velocity were the key environmental variables for the daily growth of April-spawning group.The most suitable environmental conditions for the growth of April-spawning group were water temperature(24-27℃)and velocity(0.1-0.3 m/s).SST,Temp_25 and mixed layer depth were the key environment variables for the daily growth of August-spawning group.The most suitable environmental conditions for the growth of Augustspawning group were water temperature(21-28℃)and water depth(0-50 m).Key environmental variables of different groups suggested that early growth was significantly affected by seasonal changes of water temperature,current velocity and prey abundance.This study explored the relationships between early growth and environmental variables and provided the scientific guidance for the management and conservation of U.edulis.

关键词： East China Sea Uroteuthis edulis statolith microstructure environmental variables

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Assessment of prediction model of the CPUE of neon flying squid with different sources of remote sensing data

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Acta Oceanologica Sinica 2023年第6期42卷 33-38页

作者： Liang Chang Yanli Yang Xinjun Chen Wei Yu Yangdong Li Guiping Feng Yang Zhang College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China National Engineering Research Centre for oceanic Fisheries Shanghai Ocean UniversityShanghai 201306China Key Laboratory of Sustainable Exploitation of oceanic Fisheries resources of Ministry of Education Shanghai Ocean UniversityShanghai 201306China Key Laboratory of oceanic Fisheries Exploration Ministry of Agriculture and Rural AffairsShanghai 201306China scientific observing and experimental station of oceanic fishery resources Ministry of Agriculture and Rural AffairsShanghai 201306China

Accurately building the relationship between the oceanographic environment and the distribution of neon flying squid(Ommastrephes bartramii)is very important to understand the potential habitat pattern of O.bartramii.However,when building the prediction model of O.bartramii with traditional oceanographic variables(e.g.,chlorophyll a concentration(Chl a)and sea surface temperature(SST))from space-borne observations,part of the important spectrum characteristics of the oceanic surface could be masked by using the satellite data products directly.In this study,the neglected remote sensing information(i.e.,spectral remote sensing reflectance(Rrs)and brightness temperature(BT))is firstly incorporated to build the prediction model of catch per unit effort(CPUE)of O.bartramii from July to December during 2014–2018 in the Northwest Pacific Ocean.Results show that both the conventional oceanographic variables and the neglected remote sensing data are suitable for building the prediction model,whereas the overall root mean square error(RMSE)of the predicted CPUE of O.bartramii with the former is typically less accurate than that with the latter.Hence,the Rrs and BT could be a more suitable data source than the Chl a and SST to predict the distribution of O.bartramii,highlighting that the potential value of the neglected variables in understanding the habitat suitability of O.bartramii.

关键词： Ommastrephes bartramii CPUE prediction remote sensing Rrs BT.

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Climate-induced life cycle and growth variations of neon flying squid(Ommastrephes bartramii)in the North Pacific Ocean

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Aquaculture and Fisheries 2023年第2期8卷 211-220页

作者： Yan Wang Peiwu Han Zhou Fang Xinjun Chen College of Marine Sciences Shanghai Ocean UniversityShanghai201306China National Engineering Research Center for oceanic Fisheries Shanghai Ocean UniversityShanghai201306China Key Laboratory of Sustainable Exploitation of oceanic Fisheries resources Ministry of EducationShanghai Ocean UniversityShanghai201306China Key Laboratory of oceanic Fisheries Exploration Ministry of Agriculture and Rural AffairsShanghai201306China scientific observing and experimental station of oceanic fishery resources Ministry of Agriculture and Rural AffairsShanghai201306China

Climate change has had large impacts on marine animals,including neon flying squid Ommastrephes bartramii(O.bartramii)in the North Pacific Ocean.O.bartramii statoliths from 2012,2015,and 2016 were used to evaluate the variations in life cycle events.The relationship between mantle length and body weight showed significant differences between years and gender.The oldest squid was collected in 2016 at 271 days old,further proving that O.bartramii has nearly a 1-year life span.The hatching season ranged from December to May and the peak hatching time in 2015 was one-half month later than in 2012 and 2016.Growth rates varied with environmental factors such as sea surface temperature(SST)and chlorophyll a concentration(chl.a),indicating that higher SST and chl.a concentrations led to faster growth.An extreme El Ni˜no event with lower SST in 2015 also led to younger age class and slower growth rates.The occurrence of differences in body size and growth rates between years,caused by the interannual variations of environmental factors,makes it necessary to use separate growth curves for different years when analyzing North Pacific O.Bartramii populations.

关键词： Ommastrephes bartramii Climate change Age and growth North pacific ocean

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Revealing the Fluttering Motions of Mid-Water Trawl Codend Through Sea Trials:Case Study of Antarctic Krill Trawl Codend

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Journal of Ocean University of China 2023年第2期22卷 555-564页

作者： LIU Wei TANG Hao NYATCHOUBA NSANGUE Bruno Thierry ZHANG Feng YIN Liqiang XU Liuxiong HU Fuxiang LIU Pengfei College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China National Engineering Research Center for oceanic Fisheries Shanghai 201306China Key Laboratory of oceanic Fisheries Exploration Ministry of Agriculture and Rural AffairsShanghai 201306China The Key Laboratory of Sustainable Exploitation of oceanic Fisheries resources Shanghai Ocean UniversityMinistry of EducationShanghai 201306China scientific observing and experimental station of oceanic fishery resources Ministry of Agriculture and Rural AffairsShanghai 201306China Faculty of Marine Science Tokyo University of Marine Science and TechnologyMinatoTokyo 108-8477Japan Tendering Office Shanghai Ocean UniversityShanghai 201306China

The dynamic coupling between the fluttering motions and hydrodynamic characteristics of codend is essential in understanding the trawl selectivity through fish response and the drag force acting on the whole trawl.This study investigated the effect of towing speed,warp length,warp tension,and catch size on the fluttering motions of Antarctic krill trawl codend during net shooting,towing,and hauling by using sea trial data.The time-periodicity of codend oscillation was analyzed by the Morlet wavelet transform method.Results indicated that the period of codend oscillation was between 50 s and 90 s and showed an increasing trend with the warp tension but a decreased value at the towing stage.The coefficient amplitude of codend oscillation was between 0 and 4 at the net shooting and hauling stages,and between 0.2 and 0.6 at the towing stage.The amplitude of codend oscillation increased with the warp tension,towing speed,and catch size,but decreased with the increase of the warp length.In addition,the period of codend oscillation increased with the towing speed at the net shooting and hauling stages,but decreased at the towing stage.These results from codend fluttering motions can improve the understanding of fish behavior and gear shape that modify the hydrodynamic force on the codend instantaneously.

关键词： codend fluttering motions sea trials Morlet wavelet periodicity

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High Individual Variability in Beak Stable Isotopes of Jumbo Squid off Peruvian Exclusive Economic Zone(EEZ) Waters in the Analysis of Migratory and Foraging Ecology

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Journal of Ocean University of China 2019年第1期18卷 232-238页

作者： LIU Bilin JIN Yue CHEN Xinjun LI Jianhua QIAN Weiguo LIU Na HUAN Mengyao College of Marine Sciences Shanghai Ocean University National Engineering Research Center for oceanic Fisheries The Key Laboratory of Sustainable Exploitation of oceanic Fisheries resources Ministry of Education Key Laboratory of oceanic Fisheries Exploration Ministry of Agriculture scientific observing and experimental station of oceanic fishery resources Ministry of Agriculture

Stable isotopes(δ^(13)C and δ^(15)N) have been widely used to track cephalopod habitat, migration and trophic structure. In this study, we analyzed the δ^(13)C and δ^(15)N values in 245 Dosidicus gigas beaks collected during 2009–2010 and in 2013 off Peruvian Exclusive Economic Zone(EEZ) waters. High individual variation in beak stable isotopes was shown with values ranging from-19.4‰ to-15.8‰ for δ^(13)C and from 5.0‰ to 15.1‰ for δ^(15)N. A generalized additive model(GAM) showed that latitude, mantle length and distance to shelf break significantly described the isotope variation with deviance ranging from 16.6% in δ^(13)C to 36.3% in δ^(15)N. Large variability in beak δ^(13)C values for a given size and sampling station indicated that D. gigas off the Peruvian EEZ waters migrate in different ways when they occupy a large range of habitats for their ontogeny. Low baseline δ^(15)N values suggested that spatial changes in diet trophic level may be the main determinative factor in beak δ^(15)N variation. We conclude that high variability in beak δ^(15)N values for a given set of explanatory variables indicated that D. gigas is an opportunistic predator with highly diverse dietary habitats. This study further develops our knowledge of the life history of D. gigas in such a highly dynamic region.

关键词： isotopes variability trophic level Beak Dosidicus gigas Peru GAM

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Growth marks in eyestalks of Portunus trituberculatus:A development of technique and evidence of molting

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Acta Oceanologica Sinica 2021年第4期40卷 84-91页

作者： Bilin Liu Jian Zhang Jiang Rui Zhenyu Ni Chang Shu College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China National Engineering Research Center for oceanic Fisheries Shanghai 201306China Key Laboratory of Sustainable Exploitation of oceanic Fisheries resources Ministry of EducationShanghai 201306China Key Laboratory of oceanic Fisheries Exploration Ministry of AgricultureShanghai 201306China scientific observing and experimental station of oceanic fishery resources Ministry of AgricultureShanghai 201306China

The analysis of growth bands in the eyestalk has been increasingly used for estimating crustacean ageing and molting.In this study,we developed an effective method to process and observe the eyestalk microstructure of the swimming crab(Portunus trituberculatus).We found that dark pigmentation as a result of boiling has an influence on the observation of the eyestalk microstructure.Choosing an unboiled eyestalk,this study compared the cross section and longitudinal section,and concluded that the cross section is suitable for the observation of growth increments with 6.1%CV(coefficient of variation),and growth bands are suitable for the observation of the longitudinal section with 5.4%CV.The width of growth increments near the edge of the endocuticle is small,and the width of growth increments of the middle part of the endocuticle is large.Relationship of number of growth bands to molting time was fitted to a linear function with the slope not significantly different from 1,indicating that growth bands are formed associated with molting.Periodicity of growth increment formation was calculated as 3.7 d,however was not verified.Our results provide a new improved technique for identification of crustacean molting and growth.

关键词： growth bands growth increments Portunus trituberculatus eyestalk molting

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Estimating the macrobenthic species richness with an optimized sampling design in the intertidal zone of Changjiang Estuary

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Acta Oceanologica Sinica 2019年第2期38卷 114-124页

作者： Tingting Zhang Feng Zhao Sikai Wang Tao Zhang Jianyi Liu Yu Gao Ping Zhuang East China Sea Fisheries Research Institute Chinese Academy of Fishery SciencesKey Laboratory of Fisheries Ecology of the Yangtze EstuaryScientific Observing and Experimental Station of Fisheries Resources and Environment of East China Sea and Yangtze Estuary

It is a challenge in the field sampling to face conflict between the statistical requirements and the logistical constraints when explicitly estimating the macrobenthos species richness in the heterogeneous intertidal wetlands. To solve this problem, this study tried to design an optimal, efficient and practical sampling strategy by comprehensively focusing on the three main parts of the entire process(to optimize the sampling method, to determine the minimum sampling effort and to explore the proper sampling interval) in a typical intertidal wetland of the Changjiang(Yangtze) Estuary, China. Transect sampling was selected and optimized by stratification based on pronounced habitat types(tidal flat, tidal creek, salt marsh vegetation). This type of sampling is also termed within-transect stratification sampling. The optimal sampling intervals and the minimum sample effort were determined by two beneficial numerical methods: Monte Carlo simulations and accumulative species curves. The results show that the within-transect stratification sampling with typical habitat types was effective for encompassing 81% of the species, suggesting that this type of sampling design can largely reduce the sampling effort and labor. The optimal sampling intervals and minimum sampling efforts for three habitats were determined: sampling effort must exceed 1.8 m^2 by 10 m intervals in the salt marsh vegetation, 2 m^2 by 10 m intervals in the tidal flat, and 3 m^2 by 1 m intervals in the tidal creek habitat. It was suggested that the differences were influenced by the mobility range of the dominant species and the habitats' physical differences(e.g., tidal water, substrate, vegetation cover). The optimized sampling strategy could provide good precision in the richness estimation of macrobenthos and balance the sampling effort. Moreover, the conclusions presented here provide a reference for recommendations to consider before macrobenthic surveys take place in estuarine wetlands. The sampling strategy, focusing on the three key parts o

关键词： species richness estimation sample strategy transect sampling optimization Monte Carlo simulation species accumulative curves Changjiang(Yangtze)Estuary

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The deformation characteristics and flow field around knotless polyethylene netting based on fluid structure interaction(FSI)one-way coupling

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Aquaculture and Fisheries 2022年第1期7卷 89-102页

作者： Baiqiang Zou Nyatchouba Nsangue Bruno Thierry Hao Tang Liuxiong Xu Shuchuang Dong Fuxiang Hu College of Marine Sciences Shanghai Ocean UniversityShanghai201306PR China National Engineering Research Center for oceanic Fisheries Shanghai201306PR China Key Laboratory of oceanic Fisheries Exploration Ministry of Agriculture and Rural AffairsShanghai201306China The Key Laboratory of Sustainable Exploitation of oceanic Fisheries resources Shanghai Ocean UniversityMinistry of EducationShanghai201306China scientific observing and experimental station of oceanic fishery resources Ministry of Agriculture and Rural AffairsShanghai201306China Institute of Industrial Science The University of Tokyo5-1-5 KashiwanohaKashiwaChiba277-8574Japan Faculty of Marine Science Tokyo University of Marine Science and TechnologyMinatoTokyo108-8477Japan

Knotless polyethylene(PE)netting is widely used in fisheries because of its excellent hydrodynamic performance and low cost.Netting deformation and the surrounding flow field distribution play an important role in determining the hydrodynamic characteristics of netting in moving water.In order to investigate the effect of solidity ratio and attack angle on drag,netting deformation,and flow field distribution through the netting,a fluid-structure interaction(FSI)model based on a one-way coupling combining the shear stress turbulent(SST)k-omega model and the large deformation nonlinear structural finite element model was evaluated.Our results showed the difference between the parallel and normal drag forces found in the present numerical model and experimental flume tank data were 9.17%and 11.58%,respectively.The mean relative error in the inclined hydrodynamic drag for different flow velocities and attack angles was 8.35%,6.69%,and 5.37%for the nettings 1,2,and 3,respectively.These results show that the present numerical simulation based on FSI one-way coupling can be used to examine hydrodynamic forces on netting.The flow simulation results show that there is a noticeable flow velocity decrease through the netting and a rather large velocity reduction region downstream from the netting for different attack angles.These results reveal the existence of turbulent flow due to the netting wake.It was found that the equivalent stress and total deformation increase as the flow velocity increases and solidity ratio decreases.

关键词： Knotless netting Fluid structure interaction Deformation characteristics Flow field SST k-omega model

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