检索结果-南通市图书馆

A risk table to address concerns external to stock assessments when developing fisheries harvest recommendations

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ecosystem Health and Sustainability 2020年第1期6卷 46-56,45页

作者： Martin W.Dorn Stephani G.Zador Resource Ecology and fisheries management Alaska Fisheries Science CenterSeattleWAUSA

This paper develops a risk table to facilitate incorporation of additional information into the fisheries stock assessment and management *** risk table is designed to evaluate unanticipated ecosystem and environmental impacts on marine resources that may require a rapid management *** risk table is a standardized framework to document concerns about the assessment model,population dynamics,and the ecosystem/environment that are not explicitly addressed within the stock assessment model.A scoring procedure is used to evaluate the severity of the *** concerns can then be evaluated in support for or against a reduction from the maximum Acceptable Biological Catch while providing reviewers and stakeholders transparent documentation of the *** risk table was applied successfully to several stocks on a trial basis during the 2018 groundfish assessment cycle for the North Pacific Fishery management Council,and will be used for all full groundfish assessments in *** changes in climate are likely for Alaska marine ecosystems in coming decades,and these changes are not entirely ***,we avocate that the risk table approach should be included in the suite of management tools used to address the effects of climate change on Alaska marine resources.

关键词： Acceptable biological catch ecosystem-based management risk assessment stock assessment North Pacific Fishery management Council

Evaluation of the fishery status for King Soldier Bream Argyrops spinifer in Pakistan using the software CEDA and ASPIC

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Oceanology and Limnology 2015年第4期33卷 966-973页

作者： Aamir Mahmood MEMON 刘群 Khadim Hussain MEMON Wazir Ali BALOCH Asfandyar MEMON Abdul BASET College of fisheries Ocean University of China Sindh fisheries Department Marine fisheries Department Fish Harbor west wharf Karachi 74000 Pakistan Department of Fresh Water Biology and fisheries University of Sindh Department of Economics Management and Quantitative Methods Via Conservatorio7 Universita Degli Studi Di Milano

Catch and effort data were analyzed to estimate the maximum sustainable yield （MSY） of King Soldier Bream, Argyrops spinifer （Forsskal, 1775, Family： Sparidae）, and to evaluate the present status of the fish stocks exploited in Pakistani waters. The catch and effort data for the 25-years period 1985-2009 were analyzed using two computer software packages, CEDA （catch and effort data analysis） and ASPIC （a surplus production model incorporating covariates）. The maximum catch of 3 458 t was observed in 1988 and the minimum catch of 1 324 t in 2005, while the average annual catch ofA. spinifer over the 25 years was 2 500 t. The surplus production models of Fox, Schaefer, and Pella Tomlinson under three error assumptions of normal, log-normal and gamma are in the CEDA package and the two surplus models of Fox and logistic are in the ASPIC package. In CEDA, the MSY was estimated by applying the initial proportion （IP） of 0.8, because the starting catch was approximately 80% of the maximum catch. Except for gamma, because gamma showed maximization failures, the estimated results of MSY using CEDA with the Fox surplus production model and two error assumptions, were 1 692.08 t （R^2=0.572） and 1 694.09 t （R^2=0.606）, respectively, and from the Schaefer and the Pella Tomlinson models with two error assumptions were 2 390.95 t （R^2=0.563）, and 2 380.06 t （R^2=0.605）, respectively. The MSY estimated by the Fox model was conservatively compared to the Schaefer and Pella Tomlinson models. The MSY values from Schaefer and Pella Tomlinson models were the same. The computed values of MSY using the ASPIC computer software program with the two surplus production models of Fox and logistic were 1 498 t （R^2=0.917）, and 2 488 t （R^2=0.897） respectively. The estimated values of MSY using CEDA were about 1 700-2 400 t and the values from ASPIC were 1 500-2 500 t. The estimates output by the CEDA and the ASPIC packages indicate that the stock is overfished, and needs some effective manage

关键词： stock assessment Argyrops spinifer maximum sustainable yield catch and effort data analysis (CEDA) a surplus production model incorporating covariates (ASPIC) Pakistan

Delay-Dependent Exponential Stability of Stochastic Delayed Recurrent Neural Networks with Markovian Switching

在线全文

学校读者我要写书评

暂无评论

Journal of Donghua University(English Edition) 2008年第2期25卷 195-199页

作者：刘海峰王春华魏国亮 Glorious Sun School of Business and management Donghua University Department of Applied Mathematics Shanghai Fisheries University

The exponential stability problem is investigated for a class of stochastic recurrent neural networks with time delay and Markovian switching. By using Ito＇s differential formula and the Lyapunov stability theory, sufficient condition for the solvability of this problem is derived in term of linear matrix inequalities, which can be easily checked by resorting to available software packages. A numerical example and the simulation are exploited to demonstrate the effectiveness of the proposed results.

关键词： exponential stability stochastic recurrent neural network linear matrix inequality time delay Markovian switching

Dynamic Behavior and Deformation Analysis of the Fish Cage System Using Mass-Spring Model

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2015年第3期29卷 311-324页

作者： Chun Woo LEE Jihoon LEE Subong PARK Division of Marine Production System management Pukyong National University Division of Marine Technology Chonnam National University Department of fisheries Physics Pukyong National University

Fish cage systems are influenced by various oceanic conditions, and the movements and deformation of the system by the external forces can affect the safety of the system itself, as well as the species of fish being cultivated. Structural durability of the system against environmental factors has been major concern for the marine aquaculture system. In this research, a mathematical model and a simulation method were presented for analyzing the performance of the large-scale fish cage system influenced by current and waves. The cage system consisted of netting, mooring ropes, floats, sinkers and floating collar. All the elements were modeled by use of the mass-spring model. The structures were divided into finite elements and mass points were placed at the mid-point of each element, and mass points were connected by springs without mass. Each mass point was applied to external and internal forces, and total force was calculated in every integration step. The computation method was applied to the dynamic simulation of the actual fish cage systems rigged with synthetic fiber and copper wire simultaneously influenced by current and waves. Here, we also tried to find a relevant ratio between buoyancy and sinking force of the fish cages. The simulation results provide improved understanding of the behavior of the structure and valuable information concerning optimum ratio of the buoyancy to sinking force according to current speeds.

关键词： fish cage mathematical model aquaculture computer simulation mass-spring model

在线全文

学校读者我要写书评

暂无评论

鱼群识别的氧、碳稳定同位素方法

矿物岩石地球化学通报 2011年第3期30卷 270-276页

作者：高永文鲁安怀王清印张慧琴 makah fisheries management WA98357USA 北京大学地球与空间科学学院黄海水产研究所

鱼群识别是渔业科学和管理上的重要课题之一。本文以海鱼和逥遊鱼的具体研究为例,扼要地阐明鱼耳石的氧、碳稳定同位素成分研究,特别是δ18O和δ13C的关联分析,在鱼群识别方面的效果和应用。鱼耳石是一种存在于真骨鱼类内耳中层状的,矿... 详细信息

鱼群识别是渔业科学和管理上的重要课题之一。本文以海鱼和逥遊鱼的具体研究为例,扼要地阐明鱼耳石的氧、碳稳定同位素成分研究,特别是δ18O和δ13C的关联分析,在鱼群识别方面的效果和应用。鱼耳石是一种存在于真骨鱼类内耳中层状的,矿物成分以文石为主的钙碳酸盐岩结构体。与基因分析方法相比,鱼耳石的氧、碳稳定同位素方法具有两个显著的优点,一是耳石的微结构能提供鱼类不同生长阶段的时间序列和细节;二是耳石的形成机制能提供鱼类生活的周围环境和历史信息。因此,鱼耳石中δ18O和δ13C的关联分析在鱼群识别中发挥着独特的作用。

关键词：鱼耳石稳定同位素 δ18O和δ13C 海鱼和逥遊鱼

A preliminary snapshot of the trophic model and ecosystem attributes of Kaptai reservoir ecosystem, Bangladesh

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2021年第1期39卷 223-241页

作者： Mst Halima KHATUN Partho Protim BARMAN YI Jundong Saymuna Tarin LUPA Md Mahiuddin ZAHANGIR Qun LIU College of fisheries Ocean University of ChinaQingdao 266003China Department of fisheries management Bangladesh Agricultural UniversityMymensingh 2202Bangladesh Department of Fish Biology and Biotechnology Chattogram Veterinary and Animal Sciences UniversityChattogram-4225Bangladesh

A mass-balanced Ecopath model presents a quantitative description of the trophic structure,fl ow of energy and trophic interaction among ecological groups of an *** Ecopath with Ecosim(EwE)modeling program(Version 6.5)was used to develop a preliminary trophic model for a tropical freshwater *** total fi sh biomass was 6.245 t/km 2 and the highest trophic level of the reservoir was 3.362(for snakehead).The ecosystem is phytoplankton based because primary producers originated 68%and detritus originated 32%of the total fl ow from lower trophic *** gross effi ciency of the fi shery was 0.004,suggesting the ineffi ciency of the *** positive eff ect of phytoplankton and detritus on most of the other groups were evident from mixed trophic analysis while moderately higher ecotrophic effi ciency(EE)of phytoplankton shows the ecosystem’s potential bottom-up *** competition for the same resources among diff erent groups was also *** ratio of primary production/respiration(1.969)suggests that the ecosystem is at the developing stage and utmost contemplation should be given to concerned human *** low value of relative ascendancy(30.13)and overhead(69.87)reveals the stability of the ecosystem and some degrees of *** also predicts the presence of signifi cant strength in reserve of the system to withstand or overcome any ***,ecologically sustainable resource management plans should be implemented to ensure the sustainability of this reservoir resources.

关键词： Ecopath Kaptai reservoir trophic interaction transfer effi ciency energy flow

New record of Japanese snake blenny Xiphasia matsubarai(Perciformes：Blenniidae) from South China Sea

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2018年第4期36卷 1401-1407页

作者： YI Murong ZHAO Chunxu SU Xin TAO Yajin YAN Yunrong College of fisheries Guangdong Ocean University Zhanjiang 524088 China Center of South China Sea fisheries Resources Monitoring and Assessment Guangdong Ocean University Zhanjiang 524088 China Guangdong Provincial Engineering and Technology Research Center of Far Sea fisheries management and Fishing of South China Sea Zhanjiang 524088 China

Specimens belonging to the family Blenniidae were collected in a fishery resource investigation from the coastal waters of Xisha Islands and Hainan Island, South China Sea in 2016. Combining morphological results with sequence analysis, we identified one specimen as Xiphasia matsubarai Okada & Suzuki, 1952. This represents a new record in the South China Sea. In morphology, the specimen has the following traits: body elongated, eel-like or ribbon-like in shape; flanks medium flat; the head small bluntly rounded anteriorly and without a moustache; eyes is slightly smaller, on upper lateral position of head, which is about equal to 1/5 of the length of the head; body without scales, lateral line has been degraded; both sides of the upper and lower jaws with a canine; gill is opening at the top of the pectoral fin base, approximately equal to the length of eye diameter. Dorsal fin Ⅺ, 96; pectoral fin 10; anal fin Ⅱ, 95. Head and body grey-brown, including 26 dark grey-brown bands; abdomen and lower operculum yellowish grey and colour lighter; and dorsal base long with dark grey. Origin of dorsal is located over the anterior margin of pupil; black blotch on dorsal fin between 8 th and 10 th dorsal spine; anal and caudal fins dark grey, pectoral and ventral fins pale yellow. Sequence analysis of cytochrome oxidase subunit I gene( COI) strongly supports the identity of the specimen as Ⅹ. matsubarai.

关键词： new record Xiphasia matsubarai Blenniidae South China Sea DNA barcoding

Problems and prospects of fish farming in the Chattogram Hill Tracts of Bangladesh:Community-based aquaculture might be a right choice

在线全文

学校读者我要写书评

暂无评论

Aquaculture and fisheries 2024年第2期9卷 306-313页

作者： Saifuddin Rana MdNazmul Hasan Abdulla Al Bari Shahida Arfine Shimul SkIstiaque Ahmed Sk.Ahmad Al Nahid Department of fisheries Resource management Faculty of FisheriesChattogram Veterinary and Animal Sciences UniversityKhulshi4225ChattogramBangladesh Department of Oceanography University of ChittagongChittagong4331Bangladesh

The study was carried out in Matiranga Upazila,Bandarban district,which is considered one of Bangladesh’s major hill tract *** study aimed to identify present farming conditions,prospects,and problems and suitable solutions to the problems of fish *** participatory rapid appraisal tools such as focus group discussion,field visits,and farmers’interviews were used to collect relevant fish farming information in the study *** polyculture method was the most practised aquaculture *** the selected farms,eleven fish species were identified as culture *** transportation cost for seeds purchased from remote areas was high(11%of total seed cost).The average transportation-related mortality of fish fry and fingerlings was 7.2%and 2.8%.Feed cost was found as the major cost(58.4%)in *** and revenue for fish production per decimal varied from BDT 311 to 3528 and BDT 23 to *** of vacant lake,youth and women engagement,integrated aquaculture,the desire of people to engage in aquaculture,and available human resources were found as significant *** major problems identified were lack of hatchery,high feed cost,lack of stakeholder linkage,lack of capital for fish farming,and lack of proper knowledge,guidelines,and consultancy for fish culture.A community-based aquaculture model was proposed to overcome the present challenges and problems in the study *** model may help to expand aquaculture and thus improve the livelihood and socio-economic status of the people of the hilly areas of Bangladesh.

关键词： Hilly area Aquaculture model Tribal people Fish farming prospects

Detection of spatial hot spots and variation for the neon flying squid Ommastrephes bartramii resources in the northwest Pacific Ocean

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Oceanology and Limnology 2017年第4期35卷 921-935页

作者：冯永玖陈新军刘艳 College of Marine Sciences Shanghai Ocean University Key Laboratory of Sustainable Exploitation of Oceanic fisheries Resources(Shanghai Ocean University) Ministry of Education National Engineering Research Center for Oceanic fisheries (Shanghai Ocean University) Collaborative Innovation Center for Distant-water fisheries School of Geography Planning and Environmental ManagementUniversity of Queensland

With the increasing effects of global climate change and fishing activities,the spatial distribution of the neon flying squid(Ommastrephes bartramii) is changing in the traditional fishing ground of 150°-160°E and 38°-45°N in the northwest Pacific *** research aims to identify the spatial hot and cold spots(*** clusters) of *** to reveal its spatial structure using commercial fishery data from2007 to 2010 collected by Chinese mainland squid-j igging fleets.A relatively strongly-clustered distribution for *** was observed using an exploratory spatial data analysis(ESDA) *** results show two hot spots and one cold spot in 2007 while only one hot and one cold spots were identified each year from2008 to *** hot and cold spots in 2007 occupied 8.2%and 5.6%of the study area,respectively;these percentages for hot and cold spot areas were 5.8%and 3.1%in 2008,10.2%and 2.9%in 2009,and 16.4%and 11.9%in 2010,*** half(>45%) of the squid from 2007 to 2009 reported by Chinese fleets were caught in hot spot areas while this percentage reached its peak at 68.8%in 2010,indicating that the hot spot areas are central fishing grounds.A further change analysis shows the area centered at156°E/43.5°N was persistent as a hot spot over the whole period from 2007 to ***,the hot spots were mainly identified in areas with sea surface temperature(SST) in the range of 15-20℃ around warm Kuroshio Currents as well as with the chlorophyll-a(chl-a) concentration above 0.3 mg/m^*** outcome of this research improves our understanding of spatiotemporal hotspots and its variation for *** and is useful for sustainable exploitation,assessment,and management of this squid.

关键词： Ommastrephes bartramii exploratory spatial data analysis (ESDA) spatial hot spot spatialautocorrelation variation assessment northwest Pacific Ocean